Single 12" Vented MDF Subwoofer Enclosure (Belva 1SV12B)

12-inch Vented Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.8 cu ft airspace 1SV12B)

Out of Stock - Backorder
|

List price $99.99

You Save: $55.00 (55.01%)

Thanks , You Pay:

$44.99

with warranty

Add an Extended Warranty

SquareTrade Product Warranty
60-Day Money-Back

Hassle Free Returns

365-Day Coverage

Warranty assistance for a year

Get FAST answers from customers ASK a Question See questions answers

Belva Store
Belva Subwoofer Boxes with Polyfill and 3/4-inch MDF

Built for Bass

You've got an awesome subwoofer there, pal. But where's it gonna go? You can't just throw that thing in the trunk and call it a day. Don't worry, Belva's got your back. With superior construction, great features and everything you need for bass, you'll be ready to pass up that entry-level box you've been eyeballing.

Belva Subwoofer Boxes are CARB Phase 2 Compliant

You get quality boxes with solid 3/4" MDF because nothing else will do the job right. You want to flex your windshield, not your box's innards. You get polyfill built into the box, making sure your subs perform perfectly. On top of that, you get a box that's CARB Phase 2 Compliant, meaning your box won't emit as much nasty formaldehyde as the competition. Better for your bass and better for you.

Belva MDF 3/4-inch Thickness

Look, nobody buys a subwoofer and says, 'Aw man, I just want a teeny bit of thump.' Naw man, you want something that kicks you in the chest, but you need a box that's gonna put up with it. That's where Belva comes in. While other brands use less-than-optimal 1/2-inch MDF, we've got 3/4-inch MDF to make sure you get all the bass you can handle. Why risk a busted box? Belva's the obvious choice when it comes to giving your sub a good home and giving you the low end you're looking for.

Belva MDF 3/4-inch Thickness

  • Single 12" Vented MDF Enclosure
  • Holds one 12" subwoofer
  • 3/4 MDF (Medium Density Fiberboard) Construction
  • Durable black carpeting
  • Gold Terminals
  • Tuning Frequency: 36Hz
  • Internal Box Volume: 1.8 cubic ft.
  • Dimensions: 13-5/8"H x 17"D x 19-1/4"W
  • 30 Day return policy

Speaker Box / Enclosure Specifications

Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
Subwoofer Cutout Shape
This is the shape of the enclosures cutout hole and defines the style of subwoofer that can be installed.
Round / Circle
Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Vented / Ported
Number of Subs/Speakers
This value represents the number of speakers or subwoofers that the enclosure accommodates.
1
Box Style/Shape
The box style or shape refers to the actual shape of the box. Square and rectangular boxes are straight-edged boxes on all sides, whereas hatchback and truck style enclosures feature an angled front or back design that allows for installation in places short on depth such as single cab pickup trucks. You can also use such enclosures in hatchback cars or other vehicles where space is a premium. Tube and cylinder shaped boxes were made popular by Bazooka and are a great option for those looking for a nice amount of bass without sacrificing lots of space. They may even fit in locations that slim truck boxes cannot fit in. If the enclosure is vehicle specific, we encourage you to read the product description to find out which vehicles the enclosure is made for.
Square/Rectangle
Cutout Diameter or Length
The actual diameter of the hole in the subwoofer box. Length is the measured length per side of a square subwoofer or speaker opening.
11-1/8"
Maximum Speaker Depth
Your subwoofer or speaker must not exceed this dimension in order to properly mount in this enclosure.
13-1/4"
Total Box Volume
The internal volume measurement in cubic feet before subwoofer magnet displacement.
1.8 cubic feet
Height
The height of the item, measured from top to bottom, in inches.
13-5/8"
Width
The width of the item from left to right (side-to-side) measured in inches.
19-1/4"
Depth
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
17"
Wood Thickness
The thickness of the wood the enclosure is made of, measured in inches.
3/4"
Number of Terminals
The number of terminals the enclosure has. Each terminal represents 1 positive and 1 negative.
1
Terminal Type
Spring clip terminals work best with bare wire connections with small-gauge speaker wire, or pin-type connectors.

Binding post terminals are a sturdier, more versatile type of speaker terminal. Because binding post terminals are are threaded, you can tighten them down against the wire or connector for a tight, clean connection. The most popular style of binding post terminals is known as a "5-way binding post". This type can accept bare wire, or any of the common speaker wire connectors. Binding posts with the option to be used with banana clips are even more versatile

Spring posts are a hybrid of the two. Instead of using a thread and "screwing" them tight, they use a spring to allow the wire to fit and tighten against the terminal.

Binding posts
Box Exterior Color
The color of the enclosure's exterior/outer finish.
Gray
Box Finish
The material used on the outside of the box. Most boxes are carpeted to prevent exterior scratches; however vinyl is popular as it can often be color-matched to a near exact look of your leather factory interior.
Carpet
Tuning Frequency
36 Hz
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.

Port Details

Number of Ports
The number of ports the enclosure has.
1
Tuning Frequency
36 Hz

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
70%
4 Star
19%
3 Star
7%
2 Star
2%
1 Star
1%

Average Attribution Rating

Durability
4.6
Value
4.8
Features
4.6
Design
4.6
Usability
4.7

Xenia, OH

Overall
Durability
Value
Features
Design
Usability
good

October 29, 2014

Pretty well made box. The sub hole was a little too small for my 12" hcca but a little cutting solved that. I didn't have time to make my own box so this suited me realyl well.

77 of 92 found this helpful

Was this review helpful to you?

Hendersonville, NC

Overall
Durability
Value
Features
Design
Usability
good product

May 28, 2014

Sound really good and looks good. Made fairly good. Would for sure recommend

76 of 91 found this helpful

Was this review helpful to you?

Las Vegas, NV

Overall
Durability
Value
Features
Design
Usability
well built box

December 19, 2013

For the price it cannot be beat. This box meets the recommended size enclosure for the single sub i ordered, which is the Rockford P2D4. Ported to trick the sub its in a bigger box with poly fill lining. Well built and carpeted in dark gray. I highly recommend it. Hits lows hard and loud.

70 of 83 found this helpful

Was this review helpful to you?

Pineville, LA

Overall
Durability
Value
Features
Design
Usability
Worth the space

May 5, 2014

I downgraded from a much larger box to this one and noticed no difference. Saved me some space, though it's still pretty big, and handles the sub perfectly. Feels sturdy and looks good.

67 of 81 found this helpful

Was this review helpful to you?

Harrisburg, PA

Overall
Durability
Value
Features
Design
Usability
Very very nice, exact specs below.

July 4, 2013

Very nice box. The carpet is nice and seems to be glued properly, although it does look like it might rub off in time. Build quality is very nice, feels very sturdy. There are some globs of dried glue on the exterior but nothing I can't get over. It would have been nice to not have the sub cutout so close to the port but that's just nitpicking. Doesn't come with wires internally but the terminals are much nicer than I've seen on other prefab boxes.
Regardless of what Belva has published, this box is not 1.8 ft.

The gross volume is 1.97 ft, but after taking into account port displacement, it's net volume is 1.30 ft. It's also tuned to 34.4 Hz. Determined using the Torres Speaker Box Calculator.

65 of 77 found this helpful

Was this review helpful to you?

Simpsonville, SC

Overall
Durability
Value
Features
Design
Usability
Great Prefab box

September 23, 2013

I would highly recommend this box it sounds like it is tuned between 34-36hz hits lows really good unlike i was expecting since it is vented. I had a rockford fosgate p3 and it sounded amazing in the box and now I have an Alpine type S in there until my new p3 comes back in and the type s even sounds great i didnt think a type s would pound like it did. Good box would def recommend and buy again if need be.

63 of 75 found this helpful

Was this review helpful to you?

NEWPORT NEWS, VA

Overall
Durability
Value
Features
Design
Usability
Great strong box

August 24, 2014

Great box, solid construction, easy set up. I personally prefer an exterior terminal connection that is a push type, but this screw type works just fine. I highly recommend.

63 of 76 found this helpful

Was this review helpful to you?

COLLEGE PARK, GA

Overall
Durability
Value
Features
Design
Usability
Great product

June 8, 2014

Slim and powerful speaker that packs massive power for a great price.

65 of 80 found this helpful

Was this review helpful to you?

Minneapolis, MN

Overall
Durability
Value
Features
Design
Usability
Not bad

December 23, 2013

So I bought one of the "Sonic Boxes" a couple years back and it was similar to this box but gray. The sonic box was better build quality. This box has a hole cut that is nowhere near center. It's up and to the right a bit, but that's what you get for a 55 dollar box I guess. The carpet around the ported has started to come unglued and the box hasn't had any play time what so ever. It seems to be mdf and 3/4". The dimensions are correct. Port tune is around 35 hz and net box size is around 1.4 cubic ft. The poly fill probably needs to be glued down so I will stay inside the box. The port used to be rounded on the inside with the sonic box now it is not. It is a good box to get by on since it is built pretty well, but I would recommend getting a box built to spec for the woofer you have for optimal sound. For 55 bucks it's not a bad way to get by, just don't expect the best for that price point.

61 of 72 found this helpful

Was this review helpful to you?

Holiday Florida

Overall
Durability
Value
Features
Design
Usability
Great

August 13, 2012

Greatest box I've owned sounds great in a smaller car I had it in a bigger car and would have needed two to get the bass I wanted outta them but then I bought a ford fiesta and it's smaller so it sound great and is perfect for my little car

63 of 76 found this helpful

Was this review helpful to you?

Birmingham, AL

Overall
Durability
Value
Features
Design
Usability
Solid for a cheap option

June 18, 2013

I used this with a JL Audio 12WX sub powered off a Polk Audio amp giving it 200 rms. The box produced great output considering the entry level power and for a non-audiophile the clarity will be fine. Yes, a custom made box is ideal but if that's not an option for you then this is a suitable alternative.

60 of 71 found this helpful

Was this review helpful to you?

Terrell, Tx.

Overall
Durability
Value
Features
Design
Usability
great boxes

March 9, 2015

Great construction. Good solid connections for your speaker.If I needed another one. I would look no further.

61 of 74 found this helpful

Was this review helpful to you?

North Hartland, VT

Overall
Durability
Value
Features
Design
Usability
Nice Box

March 5, 2015

This box will definitely help the RIGHT sub put out some serious bass.

60 of 72 found this helpful

Was this review helpful to you?

elgin, TX

Overall
Durability
Value
Features
Design
Usability
Belva

February 11, 2015

This cost more then the gray one but they both perform the same just that the black exterior looks way better then the gray

60 of 72 found this helpful

Was this review helpful to you?

Douglas, GA

Overall
Durability
Value
Features
Design
Usability
Awesome box

December 15, 2014

This box sounds great coupled with a Pioneer Champion Series Pro and 1500 watt amp. Very deep bass tones and very loud. Definitely would recommend.

60 of 73 found this helpful

Was this review helpful to you?

Mesa,AZ

Overall
Durability
Value
Features
Design
Usability
AWESOME BOX!!!

May 9, 2011

I dropped my Fosgate P3 into this box and HOLY CRAP!!! I had this sub in a sealed for a while and thought it was loud.....but now its insane!!!! LOUDER THAN HELL! GET THIS BOX IF YOU HAVE a TYPE R OR P3!!

58 of 69 found this helpful

Was this review helpful to you?

MILWAUKEE WI

Overall
Durability
Value
Features
Design
Usability
BEST BOX EVER

September 17, 2013

MY MUSIC IS SO LOUD NOW. I LOVE IT!! NO ONE LIKES TO SIT IN THERE WITH THE VOLUME UP. ITS AWESOME! AND SONICELECTRONICS GOT IT TO ME IN A TIMELY MANNER! THANKS!!! CARPET IS GREAT! PERFECT SIZE TOO! I HAVE A SWR12D2 ALPINE TYPE R. JUST ONE!

56 of 67 found this helpful

Was this review helpful to you?

las vegas, NV

Overall
Durability
Value
Features
Design
Usability
nice box

October 15, 2013

Nice box,good bass tones,Great price,thinking about getting another for the car,

55 of 66 found this helpful

Was this review helpful to you?

UKIAH, CA

Overall
Durability
Value
Features
Design
Usability
Great Box

August 8, 2011

I bought this for my RE sex sub and sounds perfect. my sub is a 12in sub but i had to get the sub cut out widened. Local car audio place did it for free.

55 of 66 found this helpful

Was this review helpful to you?

Bloomington, CA

Overall
Durability
Value
Features
Design
Usability
Banging

March 24, 2014

Good box for the money. Sounds great!! Feels durable. Nothing to complaint about. Always been the vented type guy.

53 of 63 found this helpful

Was this review helpful to you?

bartlett, IL

Overall
Durability
Value
Features
Design
Usability
Perfect Specs for JL 12W3V3 Ported Enclosure

December 23, 2011

I searched for a decent sub enclosure that would match the JL Audio specifications for the 12W3V3 in a ported enclosure.
This sonic sub box was a near perfect match for specified enclosure volume (1.7 cuft) and port tuned frequency (31 HZ, after measuring the port size, length and using online calculators).
Shipping was a little expensive (30.00) but it arrived in a day and 1/2. The box is solid and well constructed- not perfect- it has a hand built appearance- but it is sufficient.
The JL sub fit in the opening with no issue. The terminals are light duty but also sufficient.
After much research and deliberation, I did add some layers of poly fill batting to the walls of the enclosure's interior. I bought some pre-cut 1" thick pads from the fabric store- they were sold as baby crib side cushion padding. I put one layer on the top, bottom and left and right sides, being careful not to obstruct or block the entrance to the port slot. I put two layers on the wall directly behind the woofer. now the woofer back wave sees a group of nicely padded walls.
Again, after reading the pros and cons of doing this with a ported enclosure, I took a chance and did it before listening to the speaker- I wanted to get it right the first time I put it together. I had a hard time with envisioning running the sub with no padding on the interior walls.
The results are paying off- I seem to have plenty of output from the 12W3, and it is absolutely tight and deep when compared to other ported subs I have heard, and there is zero unwanted port noise- and no muddiness or booming.
The sound is right on the money- absolutely perfect and exceeded my expectations.
My only issue is the size of the enclosure- it takes up about a third of my small SUV's cargo area.
In the future I may try to find a much smaller enclosure and go sealed, about a third less volume than the JL specs for sealed, and maximize the volume with a complete polyfill stuffing and see what that sounds like. Maybe not though, this one sounds like a winner with the JL 12 W3 and it isn't even broken in yet!

54 of 65 found this helpful

Was this review helpful to you?

Philadelphia

Overall
Durability
Value
Features
Design
Usability
nice enclosure

February 13, 2015

This was a very good enclosure not cheap made at all I got a jl w3 12" in it and it sounds very good better than my 2 12 inch pioneer in a seal box

54 of 66 found this helpful

Was this review helpful to you?

Wisconsin

Overall
Durability
Value
Features
Design
Usability
Belva 1SV12B

February 9, 2015

This box is well vented.. Made professionally, looks nice, and bumps HARD with my Rockford Fosgate sub. It pounds the hell out of my big car. Fantastic and well worth the money.

52 of 62 found this helpful

Was this review helpful to you?

Canada

Overall
Durability
Value
Features
Design
Usability
Just got it all installed, love it.

May 6, 2011

Pros, loud as hell! Cons, its a really deep box. Got the Boss phantom subwoofer installed into this box, and couldnt be happier! I only just got it installed, but so far, it's been unbelievably loud. Recommend it for sure.

53 of 64 found this helpful

Was this review helpful to you?

FL

Overall
Durability
Value
Features
Design
Usability
Best box I've ever bought

April 6, 2014

I can't believe I didn't know about his website before now.. This box was worth every penny I spent... Great quality and amazing support when I had questions.. Will definitely be ordering from them again

51 of 61 found this helpful

Was this review helpful to you?

San Antonio, TX

Overall
Durability
Value
Features
Design
Usability
Worth the price for the convenience.

September 18, 2013

Made installation a snap without having to build something. Sounds great.

51 of 61 found this helpful

Was this review helpful to you?

troy, VA

Overall
Durability
Value
Features
Design
Usability
nice

February 2, 2012

Pretty good box mine was broke but it was probably a rare instance

51 of 61 found this helpful

Was this review helpful to you?

Valencia, CA

Overall
Durability
Value
Features
Design
Usability
Well built

July 21, 2014

I purchased this box for a 12' kicker cvx. First of all this box was built well and very sturdy. However, the sub I installed needed a little more air space. I would recommend this box for any subwoofer under 600 watts.

51 of 62 found this helpful

Was this review helpful to you?

Milner, Ga

Overall
Durability
Value
Features
Design
Usability
great buy

March 24, 2014

Its a wonderful box, I'm enjoying it right now, it sounds good in my Honda Accord.

49 of 58 found this helpful

Was this review helpful to you?

Green Bay, Wisconsin

Overall
Durability
Value
Features
Design
Usability
Nicely built, sounds great.

November 5, 2013

The box is very nice. It has polyfill in it, the polyfill is not secured very well it is probably best to go through and glue it down, and is built very nicely. The box will (more than likely) splinter when you try to screw holes into it but its MDF and that's what MDF does. It sounds great with an Orion XTR PRO 12 4 in it and hits lows very nicely.

I would definitely recommend to anyone who was looking for a relatively cheap but nicely built box.

51 of 62 found this helpful

Was this review helpful to you?

North Carolina

Overall
Durability
Value
Features
Design
Usability
Boyfriend Loves this box.

January 16, 2014

I purchased this box for my boyfriends Xmas present. He absolutely loves it. It's built strong, good insulation, love the look and overall it makes a speaker sound wonderful. His Planet Audio sounds 10x better than it ever has. Only complaint was the wiring area. Complicated to wire through so we ran them trough the port. Just as easy works just as well.

51 of 63 found this helpful

Was this review helpful to you?

Maryland

Overall
Durability
Value
Features
Design
Usability
Great value

February 21, 2013

I bought this boxes wondering what it would sound like I put my candy red audio pipe in that box Ty really gave my the boom i was looking for overall great box i would recommend it

50 of 61 found this helpful

Was this review helpful to you?

Spokane, WA

Overall
Durability
Value
Features
Design
Usability
All i can say is WOW

February 20, 2013

Well, i bought this box with a 12" rockford t2d2 to place in it. I noticed this box was around 40 pounds and my sub was around 70 pounds.

I was a bit skeptical at first when i placed it in, thinking the box would break. I have been pounding the living hell out of that sub and it has sounded clean, loud, and incredible... Perfect amount of air space, 1.8 cubes.

Def would recommend this to anyone...

50 of 61 found this helpful

Was this review helpful to you?

Fresno, CA

Overall
Durability
Value
Features
Design
Usability
Great!

August 12, 2011

Ive had no problems with this box.

48 of 57 found this helpful

Was this review helpful to you?

Bluffton, IN

Overall
Durability
Value
Features
Design
Usability
enclosure

April 29, 2014

for what it is the enclosure is well built and worht the cost. but for the application it ws recomended for its acctually to small. way to small for the sub but still worth the money if nothing elese for the quality of the build.

47 of 56 found this helpful

Was this review helpful to you?

Boise, ID

Overall
Durability
Value
Features
Design
Usability
Great Box

April 28, 2014

Would definitely recommend this box. Put a Fosgate T1 in this box and it sounds really great. Didn't think it would have enough volume for the sub but it is awesome. One of the cons when I received the box the carpet was comin off on one side, but nothing some good old adhesive spray can't fix.

49 of 60 found this helpful

Was this review helpful to you?

Canton, IL

Overall
Durability
Value
Features
Design
Usability
Awesome box, BUT DON'T buy thinking your going to hit low notes

September 6, 2013

Really good box but don't buy thinking you are going to hit the low notes. Way better then sealed!!!

47 of 56 found this helpful

Was this review helpful to you?

Easley, SC

Overall
Durability
Value
Features
Design
Usability
It is a good box

February 20, 2012

It is a really good box the only problem i have is with the terminals and the terminal cup. For one thing you might want to put some silicone around the inside to seal it off and the other thing is that the terminal nuts get lose and the terminals touched each other and blew out my sub. So if u buy this box make sure that the nut are TIGHT!!!! If not it will losen up and the terminals could touch and blow your sub.

49 of 60 found this helpful

Was this review helpful to you?

California

Overall
Durability
Value
Features
Design
Usability
pretty solid

May 3, 2011

I had a 12" Alpine Type X in this box. For the first year it slapped pretty hard and I had no complaints about the level of sound it would put out. I would be pleased but after a little more than a year my sub ripped the faceplate off of the box, or whatever u call the wood that the sub attaches too. All in all, this box would be great for a sub that is around the 500 RMS range, just be careful with big subs.

46 of 55 found this helpful

Was this review helpful to you?

Boise, Idaho

Overall
Durability
Value
Features
Design
Usability
Best box for Alpine Type R

December 27, 2014

I saw a lot of other boxes for all around the same price and the reviews were so mixed. A buddy of mine has two type r's in the basic Alpine boxes and it doesn't come close to how loud these boxes are. Personally, the 3/4" MDF/polyfil combo produces a much deeper, better bass than all of the other boxes. GET THIS BOX IF FOR TYPE E/X/R or any subwoofer that it fits the Ported Enclosure Volume range!

It is 27 December 2014 and I installed my Type R in this box with an Orion CO2400.1D amp and SoundQuest 2F Capacitor around Thanksgiving of 2014. It sounds amazing!

45 of 54 found this helpful

Was this review helpful to you?

Wayland, MI

Overall
Durability
Value
Features
Design
Usability
sturdy but bad port design

March 18, 2015

I put a alpine type r in this in my 2000 ram ext. Cab on the back seat and I can hear air rushing through the port I wish I would have went with a sealed box and the hole was off center this box would be good for a trunk of a car

43 of 51 found this helpful

Was this review helpful to you?

milford, OH

Overall
Durability
Value
Features
Design
Usability
This box works well

September 18, 2013

Paired with an alpine type r it works very well and adds much boom to my system I have no issues with this box at all not a custom but solid sounds good and much More easy to come by if you don't have time or restores to build your own, before this box my bass was loud after this box my bass was a bomb

45 of 55 found this helpful

Was this review helpful to you?

Livermore, CA

Overall
Durability
Value
Features
Design
Usability
Cut out (inches) was not accurate

October 4, 2013

I used this box with an RE REX 12" and the hole was not big enough. I'm too lazy to go back and dig up my measurements, but the hole was a tad bit smaller than advertise.

43 of 53 found this helpful

Was this review helpful to you?

Fort Myers, Florida

Overall
Durability
Value
Features
Design
Usability
Great bang for buck

October 8, 2011

Had this box with an RE Audio SEX, sounded great for a week while breaking it in then speaker fell apart lol. Now I got a Sundown SA12 and this thing slaps. Very nice for a prefab, can't beat the price. But shipping could have been better. Speaker wire terminals could be better also, but whatever it works.

41 of 50 found this helpful

Was this review helpful to you?

Laurel Hill, NC

Overall
Durability
Value
Features
Design
Usability
Good vaulue

November 18, 2010

I have type r in it . Works for me

41 of 50 found this helpful

Was this review helpful to you?

Canada

Overall
Durability
Value
Features
Design
Usability
Good tasty box

May 20, 2012

Great box. Have it with a 500 rms watt Alpine type r sub and an alpine mrp 500 amp. Sounds great in my jeep patriot suv. I bought some bananas clips in order to remove it with ease when i needed cargo space and mounted my amp in the spare tire compartment. I would recommened this sweet box to anybody.

40 of 49 found this helpful

Was this review helpful to you?

Costa Mesa, CA

Overall
Durability
Value
Features
Design
Usability
Great box

February 6, 2012

I put my Pioneer TS-W309S4 sub in here and it sounds fantastic. Just as good and clear as my friend's 15. This box was relativly inexpensive and is quite sturdy. It looks great as well. The only con would be there is i tiny chunck of carpet missing on the port, it seems like they made it quickly. Either way, this is great box, you should buy it.

39 of 47 found this helpful

Was this review helpful to you?

Longmont Co.

Overall
Durability
Value
Features
Design
Usability
Sonic Sub Box: 1SV12

March 14, 2011

Forget for a moment the price. The house system has a separate low end amp as such powered base cubes were not considered. (These became parts of a replacement).
Loaded with Fosgate P2s they work excelent.
Modifications:
Egg crate foam added inside except for port area.
1.5" wooden feet added for appearance and getting the cone area out of vacuum cleaner "range".
Suggestions.
Although the price was great I would gladly have gone a few more bucks for wood venear.
Down firing seam to be better. Would be nice if ther were that version even if somewhat larger. Size increase depending on driver characteristics.

All in all................
Good price and low hassle. The best recommendation is they need be heard, or do I mean felt.

39 of 47 found this helpful

Was this review helpful to you?

huntington beach ca

Overall
Durability
Value
Features
Design
Usability
cost the same as 3/4

May 21, 2010

This box was way more than I expected for twice the price. Shipped very fast and the carpet looks nice. Had a alpine R type in a 1cu ft box sealed that I was very disappointed in. I was gonna stash it in a corner till the end of time but I saw this box and come on 35 bucks. Pdx 1.600..........R type.........this box.........= loud clear and hits all those bass notes that you know should be there. We all have our two favorite CD's that we turn to every time you turn on a new system. Anyway my cousin is now gonna get two of them and why he wants it that ear splitting loud is way beyond me. Or is it?

40 of 49 found this helpful

Was this review helpful to you?

Rapid City, SD

Overall
Durability
Value
Features
Design
Usability
Best Sound Quality

April 29, 2011

"BEST" Box ever. I have a JL Audio 12W7 on JL Audio 1000.1 and this sub hits HARD. MY friend asked why my sub hits harder then his 2 12" Audiobahn Immortals. I Would RECOMMEND this box for serious Bass

38 of 46 found this helpful

Was this review helpful to you?

North fort myers, FL

Overall
Durability
Value
Features
Design
Usability
Awesome box for the price

July 9, 2012

Great price. This box is constructed well and looks great. I put a CVR12 in this box and it sounds a lot better than my old small sealed box setup. I would definitely recommend this box.

37 of 45 found this helpful

Was this review helpful to you?

NEW CASTLE DELAWARE

Overall
Durability
Value
Features
Design
Usability
GREAT VALUE

May 7, 2015

I WOULD RECOMMEND THIS PRODUCT NICE BOX WELL MADE FIVE STARS

36 of 44 found this helpful

Was this review helpful to you?

Jamestown ND

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Absolutely Great!

April 21, 2015

These are good quality boxes with tons of space for larger subs! Have 2 of these and each one has a RE Audio SEx V2 in it. Although I had to sand the edges of the boxes to fit those monsters in they hold up to the test and make them both sound really good! Love the black carpeting and its probably weird but these things smell great! Definitely recommend these boxes

35 of 43 found this helpful

Was this review helpful to you?

Tewksbury, MA

Overall
Durability
Value
Features
Design
Usability
Gets It Done

May 24, 2012

I like this box. It's simple, plain, sharp and clean. It was just what I needed. I have a Type R in mine, and it's wonderful. Does its job well.

35 of 43 found this helpful

Was this review helpful to you?

lorain,oh

Overall
Durability
Value
Features
Design
Usability
you get what u pay for

April 24, 2012

Do not try to put a sub that can handle a ton of watts in this box. I have an re. xxx12 and blew the joints out of this thing...other than that I'm sure it is good for subs putting out less than 1000 watts...

34 of 42 found this helpful

Was this review helpful to you?

Brentwood, ny

Overall
Durability
Value
Features
Design
Usability
Excellentt

April 23, 2012

Product is real good and have used for more than 6 months still working really good.

33 of 41 found this helpful

Was this review helpful to you?

Sherman Oaks, CA

Overall
Durability
Value
Features
Design
Usability
Um Yeah !!!!

November 2, 2011

If your questioning the quality of this enclosure. Question No More. It is built sturdy, solid (not dry) MDF, all corners are properly sealed, last but not least they even took the extra step in making the Tuned Port Wall with a Rounded Edge!!!! I don't care who you are thats A GREAT DEAL!!!!

Perfect for the EARTHQUAKE SOUND Tremor -X124
P.S Remove the Terminal Box and throw a bead of silicone around it. It will eventually allow air to escape.

32 of 40 found this helpful

Was this review helpful to you?

Salina, KS

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Great box!

June 12, 2015

This box looks and sounds amazing! Its so loud and definatly worth it at this price!

28 of 34 found this helpful

Was this review helpful to you?

Hixson, TN

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Belva Vented Woofer Enclosure

September 16, 2015

My NVX VCW 122 fit with ease in this enclosure. The enclosure has a nice black carpet covering it and has polyfill to really bring your woofer to life. Not to mention this enclosure survived a hard wreck due to a drunk driver hitting my tail end. It currently is dinged on the exterior a little but works phenomenally.

11 of 14 found this helpful

Was this review helpful to you?

Latrobe PA

Overall
Durability
Value
Features
Design
Usability
Nice box

November 1, 2015

Strong nice box. Put a Cerwin Vega hed 12 in it and it sounds amazing.

7 of 8 found this helpful

Was this review helpful to you?

Philly

Overall
Durability
Value
Features
Design
Usability
Solid!

May 2, 2018

Nice solid enclosure my infinity kappa hits very nice in this

0 of 0 found this helpful

Was this review helpful to you?

Louisiana

Overall
Durability
Value
Features
Design
Usability
Great Value

April 26, 2018

I bought this for my 12” Alpine. Sounds awesome. Cheapest price and quality is super.

0 of 0 found this helpful

Was this review helpful to you?

MA

Overall
Durability
Value
Features
Design
Usability
Great value

April 25, 2018

Very high quality box especially for the price. Thicker than most boxes on the market too which is a plus.

0 of 0 found this helpful

Was this review helpful to you?

Maryland

Overall
Durability
Value
Features
Design
Usability
Great value

April 13, 2018

Box is sturdy and nicely build. However the speaker wire attachment wasn't to good.

0 of 0 found this helpful

Was this review helpful to you?

Heber ca

Overall
Durability
Value
Features
Design
Usability
Great quality

April 9, 2018

Great quality overall does the job and for the price im extremely happy with it !!!!!!!!!!!!!!!

0 of 0 found this helpful

Was this review helpful to you?

Columbia, SC

Overall
Durability
Value
Features
Design
Usability
Well built, excellent value

March 29, 2018

I was surprised of the quality of these sub boxes when they arrived. For the money, I doubt you could do better and I've purchase other similar boxes at twice the price that don't measure up to these. The acoustical damping material is also a bonus, although it would be nice to have a little more "stuffing" for better damping. But you can always add some fiberglas insulation if needed. I will be using these again. The only other suggestions would be to add another small cutout hole for the additional of a tweeter, which is what I did on 8 of these. I am not using the box as a subwoofer, but a two way full range system and Eminence drivers.

0 of 0 found this helpful

Was this review helpful to you?

$city, $state

Overall
Durability
Value
Features
Design
Usability
Great sub box for my alpine type r

March 28, 2018

Great quality box Works perfect with my alpine type R great sound and great quality

0 of 0 found this helpful

Was this review helpful to you?

Oklahoma

Overall
Durability
Value
Features
Design
Usability
It awesome!

March 23, 2018

The sound so smooth and great bass with those box! I would keep buy it! Grade A for that box and it come in as great shape! No damage or anything

0 of 0 found this helpful

Was this review helpful to you?

Scranton pa

Overall
Durability
Value
Features
Design
Usability
Great box for being a prefab!

March 19, 2018

If you are just getting into car audio and want something ported and have an entry level P2 or something along those lines, this subwoofer box is amazing for the 12" subs!! I upgrade my sub a week ago... Unfortunately it's choking my new sub like a mofo!! But it's also a custom built psi platform 2 with hd upgrade ????. Overall I'd recommend this to anyone who wants to start off car audio with ported boxes

0 of 0 found this helpful

Was this review helpful to you?

Myrtle Beach, SC

Overall
Durability
Value
Features
Design
Usability
Great product

March 19, 2018

The product comes packed with polyfill sheets which I didn’t expect (though it’s probably in the description). The wood is cut at sharp angles which is expected but the carpeting is very thin which I wasn’t a huge fan of. I also have a B-Box and it had thicker carpeting giving it a much better feel. The terminals are nicer than expected, accepting banana-type connections as well as screwing down on the ends if you don’t have banana connectors.

0 of 0 found this helpful

Was this review helpful to you?

Milton FL

Overall
Durability
Value
Features
Design
Usability
ported enclosure

March 13, 2018

Well made and padded inside. Looks good and sounds good too.

0 of 0 found this helpful

Was this review helpful to you?

Mesa, AZ

Overall
Durability
Value
Features
Design
Usability
Nice box

March 12, 2018

Got this box for free with my Image Dynamics IDQ12. Box is sturdy and looks nice. No complaints even if I had to pay for it. Would buy.

0 of 0 found this helpful

Was this review helpful to you?

Houston

Overall
Durability
Value
Features
Design
Usability
Free Box

March 8, 2018

The box was free with the purchase of a 12 inch infiniti Kappa sub. I read a review stating that it perfectly, that is not true. I had to widen the hole so the sub could fit flush. Why include a box when its now made for it?

Anyways it seems to be durable and do not take up much space which was a plus for me being a family man. It do look cheap though. I can't speak on sound because the kappa is weak compared to my 15 P3 so I'm not sure if it's the box or the sub. I think it's a good box for an overall cheap set yup. I plan to go sealed

0 of 0 found this helpful

Was this review helpful to you?

Atkins, IA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Great product

November 28, 2017

This 12" subwoofer box was well built and shipping of product was fast.

0 of 0 found this helpful

Was this review helpful to you?

Staten island, NY

Overall
Durability
Value
Features
Design
Usability
Amzing

September 15, 2017

The sound quality this box delivers is amaziing!! I love it! I ise it with a Jl 12 in sub,,, the results are incredibly amazing!! Jl delivers the best quality of sound.

0 of 0 found this helpful

Was this review helpful to you?

Schenectady, NY

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Major air leaks

August 28, 2017

I got this free with a sub (IDQ12)
The box seems sturdy and well constructed but the air leaks were so loud that I couldn't fully enjoy my new subs. Not sure if I can do anything to remedy it on my end as I don't wanna go thru the hassle of doing a return. I'm sure it's a great box. I just happened to get a defective one.

0 of 0 found this helpful

Was this review helpful to you?

Independence, MO

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Decent box

August 24, 2017

Good we'll built box. Fits decently in my F150 extended cab. Never had need far back. So box, subs, amps, ect, fills the empty space perfectly

0 of 0 found this helpful

Was this review helpful to you?

vallejo, CA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Solid investment. worth the money

July 14, 2017

This is a great subwoofer box for someone looking to add some decent low in punch to their system. I used it with a kenwood kfc 12 (400 rms) sub and it works really well. The tuning of this box is lower than most in this price range. Polyfil is a added bonus. This is for standard 12 subs. Would not use for anything serious (800+ rms) as the box will easily start to fall apart.
This does not mean its a bad or cheap box. Its just not designed for higher spl type subs.

0 of 0 found this helpful

Was this review helpful to you?

$city, $state

Overall
Durability
Value
Features
Design
Usability
Weak terminals

July 8, 2017

Terminals are weak. At 1 ohm 800 rms they melted. Other then that sub sounds good. Nice strong soild box

0 of 0 found this helpful

Was this review helpful to you?

New york

Overall
Durability
Value
Features
Design
Usability
Great value

October 27, 2016

Works and sounds great does what it soppose to do

0 of 0 found this helpful

Was this review helpful to you?

Tampa, FL

Overall
Durability
Value
Features
Design
Usability
big black box

October 2, 2016

sound awesome with my 12" nvx speaker my truck now shake. the box was build with 3/4 wood very nicely make.

0 of 0 found this helpful

Was this review helpful to you?

Allen Park, MI

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Great for my RE 12" Sub

September 8, 2016

Nice box. Well built and very sturdy. I like the binding posts, too. I had to file the opening just a bit to fit the RE SEX V.2 that I put in it. No biggie. I also pulled back the poly-fill that was covering the vent opening and stapled it to the vent board so air could move more freely.

0 of 0 found this helpful

Was this review helpful to you?

East grand forks, MN

Overall
Durability
Value
Features
Design
Usability
Great box

August 22, 2016

Good sound can't beat the price for this box
I would buy again and recommend it to others

0 of 0 found this helpful

Was this review helpful to you?

Russell, KS

Overall
Durability
Value
Features
Design
Usability
Amazing quality

August 3, 2016

This box is incredibly solid, my 12inch Alpine mounted no problem. The port on this box is nice and had a really good tone, excellent sound, sounds like a 15inch slamming I'm my trunk. Will fit in a 1994 Ford Mustang with no modifications if anyone needs to know.

0 of 0 found this helpful

Was this review helpful to you?

Ocala Florida

Overall
Durability
Value
Features
Design
Usability
Nice Box!

March 10, 2016

Well built and stands up to my digital design's 712 hits highs hard and picks up some lows overall great frequency output! Definitely worth the money and looks good with my car interior I'd highly suggest.

0 of 0 found this helpful

Was this review helpful to you?

Topeka, KS

Overall
Durability
Value
Features
Design
Usability
Cannot be beat for the price.

February 16, 2016

Heavy construction with heavy duty speaker terminals. Very pleasing to the eye with good quality carpet.

0 of 0 found this helpful

Was this review helpful to you?

beaver pa

Overall
Durability
Value
Features
Design
Usability
suprised

January 4, 2016

I wAs surprised when it came in the mail how heavy and greatly built and sturdy it was out my Memphis in it and was blown away 50 bucks sounds like a lie but your won't be disappointed

0 of 0 found this helpful

Was this review helpful to you?

Los Angeles

Overall
Durability
Value
Features
Design
Usability
12 Subwoofer Box

December 29, 2015

I recently bought this product for my Pioneer Champion Series Pro 12 & it goes well with it..
Would recommend it if your going for something small & space saving..

0 of 0 found this helpful

Was this review helpful to you?

Accessory Tools and Products

Accessories added

NVX XKIT42 - 4 Gauge Amp Kit

Pure Virgin Copper, 4 Gauge Amplifier Installation Kit

Your Price $59.99

Belva BAK42 - 4 Gauge Amp Kit

CCA 4 Gauge Wiring Kit with RCA & Speaker Wire

Your Price $24.99

8 Gauge - Stinger Amp Kit

Single amplifier 4000 Series complete installation kit.

Your Price $36.99

Belva BAK02 - 1/0 Gauge Amp Kit

CCA Wiring Kit with 2-Channel RCA & Speaker Cable

Your Price $39.99

NVX XKIT02 - True Spec 1/0 Gauge Amp Kit

Pure Virgin Copper, Full 1/0 Gauge Amp Kit with RCA

Your Price $134.99

Scosche WGB12

12" Protective Waffle Style Subwoofer Grille

Your Price $8.00

High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.

Your Price $45.99

NVX SDRLR1 Universal Roller Tool

Install your sound damping with the SDRLR1 tool

Your Price $7.99

20 ft. of Dynamat Xtreme Trunk Kit

Keep your trunk from rattling and improve bass quality by using a sound dampening trunk kit.

Your Price $177.99

36 ft. of Dynamat Extreme Bulk Pack

Make your sound system sound perfect by reducing road noise with 9 sheets of sound dampening material.

Your Price $287.99

Banana Clip Terminals

These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection.

Your Price $1.99

Insulated Female Quick Disconnect Connectors

100 pack of 12-10 Gauge yellow insulated quick disconnects.

Your Price $11.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles or can be used for your polyfil.

Your Price $8.99

Car Stereo and Speaker / Subwoofer Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $11.99

Browse 12 questions and 81 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Good deal and have always enjoyed Infinity products
Andrew W on Jan 30, 2018
The sealed enclosure I have restricts the sound of my current sub too much
Rodney N on Jan 5, 2018
Free ported box
Hunter W on Jan 25, 2018
The site said it matched the speakers needs
Roderick T on Jan 5, 2018
I ordered the Sony GS series sub, the model right before the one just released, and I also ordered this box. Will 3/16th of an inch cause me not be able to use this box with that sub? The recommended cut-out diameter for the sub is 10 and 15/16th and the box's cutout is 11 and 1/8th
Ross R on Jan 20, 2015
Best Answer: You should be fine. That is basically the cutout is basically only the size of the subs cone, so you will have some very slight wiggle room.

I'm not sure which sub you got but if it's this one, here is the spec. Says your mounting bracket is almost 12" inch so you should be good to go. If you go to Sony's site you can pull the manual. I looked at it but it would not let me post a link in here.

Cheers!

About this box....
1. The reviews didn't lie. The volume in the specs on their website is not accurate. It does not take into account the port space lost. So make sure your sub can run properly (produce proper bass) with the loss of some internal volume. The numbers in that document look like it should be fine but I didn't look hard.

2. Depending on the amount of juice your pushing to that sub, the box 'is' going to need some elbow grease work. Pull out that white material temporarily and put sound dampening around all corners/edges (except the mounting area). Then put it back.

I have an 12" Orion XTR Pro pushing [email protected] and it sounds great. Before I put in the dampening, it was horrible. The thing vibrated/rattled out the waazooo. Afterwards, it sounds great but still not perfect.
Reply (1) · Report · Drepi on Jan 20, 2015
· Add Answer · I Have This Question Too (0)
Will the 12' power acoustic mofo fit on this box?
A shopper on Jun 21, 2015
Belva 1SV12B
Belva 1SV12B
Power Acoustik MOFO-124X
Power Acoustik MOFO-124X
Best Answer: Well, the cutout diameter on the box is 11 1/8" and this speaker needs a 11 1/4" cutout diameter to fit. I would get it and if it does not fit I'll take a router and opened just a little to make it fit. But that's just me being a risk taker and a little DIY guy. Hope this helps. Good luck.
Reply · Report · Oscar R on Jun 22, 2015
· Add Answer · I Have This Question Too (0)
What is the port length on this box?
Jesse on Sep 17, 2014
Best Answer: 14.5 inches
Reply · Report · jeremy b on Sep 21, 2014
· Add Answer · I Have This Question Too (0)
Does this sub have a net volume of 1.8 Cubic feet??? If not, what is the net volume. i need a minimum of 1.75 net volume for my Kicker CompR 12in
sergio g on Jun 21, 2015
Best Answer: Yes the net is 1.8. Your sub should be fine, the CompRs don't really need that much airspace like some other higher-end subs.
Reply (1) · Report · Alex H on Jun 21, 2015
· Add Answer · I Have This Question Too (0)
Does this box have 1.8 cubic feet even with the foam Poly-Fil inside????
sergio g on Jun 21, 2015
Best Answer: I don't think they took that into the volume measurement, but what I can tell you is that the polyfill essentially tricks the subwoofer into thinking it's in a larger box. I have this box paired up with a Rockford Fosgate P3 12" running 600watts rms @ 2 ohms. At first I thought the box looked a bit cheap to be honest but I guarantee its worth the price cause my bass sounds clear and loud at any level. This box sounds really nice.
Reply · Report · Jake P on Jun 22, 2015
· Add Answer · I Have This Question Too (0)
Could I put a xfl1244 in this?
Nick H on Mar 28, 2015
Best Answer: Yes its fits, the top mount depth of the American Bass xfl1244 is 7.6 inches. The Depth of the Belva 1SV12B is 17". Ironically the American Bass website does most its measurement's in metric but the cones diameter is 285mm(11.2in) and the frame diameter is 325mm(12.8in). All that means is that it will fit perfectly.
Reply · Report · Nicholas J on Mar 28, 2015
· Add Answer · I Have This Question Too (0)
Is this box good for a Fosgate P3D2-12 ?
Scott H on Jun 10, 2015
Best Answer: I believe it should do you pretty good. I installed a Rockford Fosgate T1D4-12 in it and it bumps hard
Reply · Report · Alexandro A on Jun 10, 2015
· Add Answer · I Have This Question Too (0)
Does this come with mounting screws?
Taylor S on Jul 15, 2015
Best Answer: Hello Taylor,

No. No enclosure arrives with hardware.
Reply · Report · Rick MStaff on Jul 15, 2015
· Add Answer · I Have This Question Too (0)
what is the cutout size for the subwoofer? thank you
A shopper on May 17, 2015
Best Answer: Hello,

As specified in the feats & specs tab: "11-1/8"
(note: this measurement is Never exact, and is often more narrow. This is purposely done so the user can widen the opening to their need. )
Reply · Report · Rick MStaff on May 17, 2015
· Add Answer · I Have This Question Too (0)
Can I get this box with gray carpet?
Jason G on Mar 8, 2015
Best Answer: Hello Jason,

Unfortunately, the Gray Carpet version of this enclosure is out of stock.

Belva Sub Box 1SV12G
http://www.sonicelectronix.com/item_7498_Belva-Sub-Box-1SV12G-Gray.html
Reply · Report · Customer SStaff on Mar 9, 2015
· Add Answer · I Have This Question Too (0)
Does this box fit in a Ford Ranger Extended cab 2010?
A shopper on Feb 1, 2015
Best Answer: Hello,

We do not have the dimensions for the available space within a given vehicle. Please use the dimensions we've provided - 13-5/8"H x 17"D x 19-1/4"W - and compare them to the dimensions of your vehicle; This will require that you measure the intended location.
Reply · Report · Customer SStaff on Feb 2, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

1SV12B

Weight

35.00lbs

Internal SKU

1sv12b

Internal Product ID

19279

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Single 12" Vented MDF Subwoofer Enclosure (Belva 1SV12B)

Item Added to Cart

Single 12" Vented MDF Subwoofer Enclosure (Belva 1SV12B)

12-inch Vented Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.8 cu ft airspace 1SV12B)

$44.99

Keep Shopping

Get Added Peace of Mind with SquareTrade

Why SquareTrade?

  • The #1-Rated Protection Plan
  • 5-Day Service Guarantee & Free Shipping
  • Protection from Normal, Everyday Use
You have added a warranty
$4.99
Add Warranty
3 years of protection

NVX XKIT42 - 4 Gauge Amp Kit

Pure Virgin Copper, 4 Gauge Amplifier Installation Kit

$59.99

Add
Scosche WGB12

12" Protective Waffle Style Subwoofer Grille

$8.00

Add
High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.

$45.99

Add

Don't see the accessory you're looking for?
View all available accessories for the Single 12" Vented MDF Subwoofer Enclosure (Belva 1SV12B).