Belva 1SV12G Single 12" Vented MDF Enclosure - Sonic Electronix

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Belva Sub Box 1SV12G (Gray)

Single 12" Vented MDF Enclosure

In Stock | new
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List price $99.99

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$44.99

with warranty

Order within 19 hrs 10 mins to ship 10/21

Arrives by Wednesday, Oct. 23 to zip 23465

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50% Off Speaker Wire with Enclosure Purchase

Get 50% Off Belva 12 Gauge Speaker Wire when you purchase a Belva Subwoofer Enclosure. Simply Click the "Add Both to Cart" button to the right. This offer cannot be combined with any other coupons or offers.

7.50

7498

401

Belva Sub Box 1SV12G (Gray)

$44.99

+

50% OFF

Belva BBSW127

$14.99

Special Price $7.49 ($14.99 if purchased separately)

Belva BBSW127

• 7 Meters
• 12 Gauge Speaker Wire
• High Strand Count for Maximum Flexibility
• 23 Foot Length

(Offer 1 of 1)

Combined Total Price

$52.48

You Save $7.50

 

Belva Sub Boxes are custom built to fit your application. Enclosures are made with only the highest quality materials, including 3/4" MDF, to ensure your subwoofer enclosures can handle the test of time and the thump of your new subs.

  • Single 12" Vented MDF Enclosure
  • Holds one 12" subwoofer
  • 3/4 MDF (Medium Density Fiberboard) Construction
  • Durable gray 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

Port Details

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

Warranty and Return Policy

Parts Warranty Duration
Not warranted
Labor Warranty Duration
Not warranted
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
70%
4 Star
23%
3 Star
3%
2 Star
3%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.8
Features
4.6
Design
4.7
Usability
4.8

Novi MI

Overall
Durability
Value
Features
Design
Usability
decent box

September 1, 2012

i bought this box for the newest alpine type r.... lets say it sounded decent but not good enough for me, i have had many sound systems and this didnt sound so good with the type r..... if your decide to get a type r id go with a 3.0 cu ft box tuned 32-38hrtz for the best deep loud sound quality

57 of 67 found this helpful

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Chicago IL

Overall
Durability
Value
Features
Design
Usability
Bela Sub Box 1st 12 box

January 8, 2015

The box is built great, sturdy. I didn't pay attention to the overall dimensions the box is bigger than your average 12" box.
So if your looking to put this box in your car make sure you pay attention to the dimensions. But if your building a subwoofer for home or small club this box will do the job.

53 of 62 found this helpful

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dallas

Overall
Durability
Value
Features
Design
Usability
works great

April 15, 2014

Hooked it up with an re audio srx 12 and it sounds great very very happy.

54 of 64 found this helpful

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Minneapolis, MN

Overall
Durability
Value
Features
Design
Usability
Great Box!

December 20, 2010

This is a nice box for the price. I normally build my own boxes but I didn't have much extra time and it is too cold out to build one anyways, so I bought this one and I'm sure glad I did. Realistically to buy a sheet of MDF, spray adhesive, bottle of wood glue, nails, and carpet costs about the same as this box and it is already made. Sure it is prefab, but its a very good prefab enclosure. This is real 3/4 inch mdf and the port is tuned pretty low too. I would guess like 34-36 Hz or so. Very solid construction and rounded off port on the inside. Carpet looks great. Terminals are nice too, although they are plastic fasteners, they will hold up just fine. I have a Phoenix Gold rsdc in this box and it slams! I can feel the bass pounding my chest. If you want a nice loud box, this is the box you want. Exceeded my expectations by far!

54 of 64 found this helpful

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Sacramento, CA

Overall
Durability
Value
Features
Design
Usability
Great Solid Box

September 30, 2010

This box is built very well. It's perfectly tuned for the Alpine SWR-1243D Type-R that I also got from Sonic Electronix. The SPL of this combo is ridiculous in the trunk of my '09 Civic Si Sedan, and it leaves more than 3/4" of my trunk space left for other junk. Definitely recommend. With a set of banana plugs also ordered, I still only spent less than $225 which includes the price of shipping for these three items. Speaking of which, I ordered in the early hours of Tuesday (switching over from Monday) and I got the these three items delivered to my door by 11AM Wednesday! There's no way you can find a better deal than that! Now all I need for this combo is some serious Dynamat to keep everything from rattling apart.

54 of 64 found this helpful

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Elmer, NJ

Overall
Durability
Value
Features
Design
Usability
Not correct box volume

November 9, 2014

The box is advertised to have 1.8 cubic feet of volume. It's not, the actual volume when taking into the account of the wood thickness and the ports is 1.3 cubic foot. Plus when you add a sub in it that will also take up some volume so you can count on 1.1-1.25 cubic feet with a sub mounted. The 1.8 cubic foot might be true if their talking about total volume of the outside but that is compleatly irrelevant. The only volume that is important is the inside of the box. And yes the difference between 1.8 and 1.3 is a lot and will make a difference

53 of 64 found this helpful

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canton, TX

Overall
Durability
Value
Features
Design
Usability
great

April 15, 2014

hooked it up to re audio srx 12 and it sounds great

50 of 61 found this helpful

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Biloxi, MS

Overall
Durability
Value
Features
Design
Usability
Sounds great

February 9, 2014

This box sounds great with my alpine 12. The terminals were easy and the box is put together well.

49 of 59 found this helpful

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Cheyenne, WY

Overall
Durability
Value
Features
Design
Usability
A+ product

January 29, 2009

Fast Fast shipping. For all you guys that are looking for a clean box with great value and durability this it. I'm using it to support my 12" Olympus Series Dual 2 ohms Subwoofer (OLM-1612). Buy it !!!!!!!

47 of 55 found this helpful

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Canada

Overall
Durability
Value
Features
Design
Usability
Sick box.

April 29, 2014

It's pretty massive. Carpet matched my trunk which is a win. Screw terminals are not the best but they work.

46 of 54 found this helpful

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Portland, OR

Overall
Durability
Value
Features
Design
Usability
Good Box for Cheap

May 4, 2014

I needed a box for a C2 Audio Threatcon 4 subwoofer. C2 cuggests a box near 2 cubic feet tuned to 35 hz. This one is tuned to 36 as a I recall so it's pretty close. It's nicely constructed. Wish that it were slanted so that I could put it up against the rear seat of my car and that it were tuned a bit lower. For 35 bucks I couldn't build it for less.

46 of 55 found this helpful

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Saegertown, PA

Overall
Durability
Value
Features
Design
Usability
Awesome

October 15, 2014

Great sub box, looks good. Its heavy, heavier than i expected. Lined with the poly fiber stuff as well

47 of 58 found this helpful

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Jupiter, FL

Overall
Durability
Value
Features
Design
Usability
great box

September 14, 2014

I bought this belva 12in box last month and put a 12 in kicker comp r in it whick I'm putting 800 watts rms to it and it sounds great. This box is also listed at a great price.

45 of 54 found this helpful

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Walnut Creek, CA

Overall
Durability
Value
Features
Design
Usability
Great

December 20, 2009

I bought this box for my Rockford P3. The box takes up half of my trunk but it slams my sub. You can't find a better deal on a ported box like this anywhere

45 of 54 found this helpful

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elgin, TX

Overall
Durability
Value
Features
Design
Usability
Belva

February 11, 2015

I have 2 of these in my car but they do the job with Type-R's no complaints

43 of 51 found this helpful

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Aurora, IL

Overall
Durability
Value
Features
Design
Usability
awesome subwoofer box

January 8, 2014

This subwoofer box is great and produces a lot of loud bass. However it is huge so make sure you have enough room.

46 of 57 found this helpful

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conway, arkansas

Overall
Durability
Value
Features
Design
Usability
Bad.

February 12, 2013

I bought this box a while back and one of the speaker wire terminals is loose causing the connection to be weak.. its been loose since I got it but it just recently started causing problems.

44 of 53 found this helpful

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Wenatchee, Wa

Overall
Durability
Value
Features
Design
Usability
Nice product

May 26, 2010

This box is a very nice box especially for the money. Gives a crisp clean sound and doesnt matter what type of music you are listening to.

44 of 53 found this helpful

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Conroe, TX

Overall
Durability
Value
Features
Design
Usability
well built

March 9, 2009

this is a very solid, well built box. the box is sealed well at all seams also and made of good quality mdf. I have a kicker cvr in it and it sounds great. great choice for a single ported enclosure. can\'t go wrong. by the way, i think it has great binding posts. good value, it won\'t disappoint.

45 of 55 found this helpful

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MANASSAS, VA

Overall
Durability
Value
Features
Design
Usability
Belva sub box

December 21, 2014

I have owned this subwoofer box for 30 days now and it sounds great and looks great. The porting on the box makes it sound even better. And is the best box for the money

44 of 54 found this helpful

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OR

Overall
Durability
Value
Features
Design
Usability
1SV12

August 10, 2010

I bought this box for an Alpine Type R 12. I usually build all my own ported boxes but I decided to save some time and buy this one. The box is built from quality 3/4" MDF, the carpet looks great, and the seams are well caulked. What you really should know when buying this box, it is around 1.5 cubic feet net, and tuned to around 35hz. A little small for most 12's in vented applications, but the 35hz tuning was a pleasant surprise. Most prefab boxes I've seen are tuned >40hz and can't quite hit the low notes. Overall, definitely a great value and a decent design.

45 of 56 found this helpful

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Livermore, CA

Overall
Durability
Value
Features
Design
Usability
decent sub box

June 14, 2010

Bought this box for my son and put a sony 12 and visonic amp and it hits pretty hard and very loud but not as tight as the sealed box he had so he loves it because he's a teenager !

43 of 52 found this helpful

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Findlay,ohio

Overall
Durability
Value
Features
Design
Usability
Not to bad but could be bigger

February 12, 2010

Got this box to house a American bass xfl 12". I needed a bigger box but I have a small trunk so my options are limited. my 12" beats in this box just not at full potential. good box for pre-fab

43 of 52 found this helpful

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Silver City, NM

Overall
Durability
Value
Features
Design
Usability
Great Speaker Box

March 22, 2009

Makes a big difference in the bass. This box is good for a smaller type of trunk.

45 of 56 found this helpful

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Mesa, AZ

Overall
Durability
Value
Features
Design
Usability
Great box

March 16, 2009

I put an Audiobahn Alum12X in it with a 200 watt RMS amp. I had to widen the hole a little to get it to fit. It is nice and loud. I put it in the back of my Honda Element so the port fires under the rear seat toward the driver seat. For the cost it cant be beat. It would have taken me hours to put one together. What a time saver. This is the first box I have ever purchased. I usually just make my own.

42 of 50 found this helpful

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Greenville, NC

Overall
Durability
Value
Features
Design
Usability
Awesome box

September 16, 2008

Looks attractive, feels sturdy, wasnt expensive. Perfect for my memphis 12. I actually ended up with the exact box except black.. so i assume the picture is wrong, although i'd rather a black box anyway.

43 of 52 found this helpful

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Onsted, MI

Overall
Durability
Value
Features
Design
Usability
Great box for a prefab

October 7, 2014

I have a RE Audio SXX 10” in it. Sounds great in the box tight and clear. Bo is tuned to 36hz. Great box.

43 of 53 found this helpful

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chicago, IL

Overall
Durability
Value
Features
Design
Usability
Solid well built box.

May 25, 2014

This box is great. ! I have a Power Acoustik GW3-12 in this box and it really pushes some air! All my mirrors are blurry while im driving nice clean bass

42 of 51 found this helpful

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Oregon

Overall
Durability
Value
Features
Design
Usability
Sub Box

October 3, 2010

Great box! Excellent quality, especially for the price. Have had it for 6 months now and it looks like new. Very impressed for how cheap the price was!

40 of 47 found this helpful

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WA state

Overall
Durability
Value
Features
Design
Usability
works well

April 20, 2010

works well with my alpine 12". installed the sub into it myself, very easy. good value. go sonic!

41 of 49 found this helpful

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San Mateo, CA

Overall
Durability
Value
Features
Design
Usability
great buy

February 22, 2010

my brother bought this for his kenwood 12. it sounds like he has 2 12s. the crazy thing is he is only pushin 220watts rms. box makes all the sound. get this if you need a great box

41 of 49 found this helpful

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Hill City, SD

Overall
Durability
Value
Features
Design
Usability
great box great price

May 6, 2009

u will never find a better ported box for this cheap. it is very well built. sadly it is currently serving as a nightstand in my bedroom due to the sub no longer living there lol

42 of 51 found this helpful

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Bloomington, MN

Overall
Durability
Value
Features
Design
Usability
Strong Box !!!

October 13, 2014

A well made , strong, & nice looking box .Being glued then screwed is the only way for a sub box, to be made , with the vibbrations it must enduere ,this one pass the test .I have recomended them .

42 of 52 found this helpful

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Bellinham, WA

Overall
Durability
Value
Features
Design
Usability
Outstanding quality & Price

July 10, 2014

Would recommend, sturdy construction with insulation.
Improved bass quality, w/new box I could hear bass notes that were missing before.

40 of 48 found this helpful

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Reno, NV

Overall
Durability
Value
Features
Design
Usability
great box for the price

April 19, 2014

It sounds great. and looks nice. fits well in my trunk also

41 of 50 found this helpful

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Bismarck, ND

Overall
Durability
Value
Features
Design
Usability
Great so far!

January 31, 2010

Bought it six months ago to house an Adire Brahma 12" (old-school). I needed 3/4" MDF and around 2sq.ft., ported... Even with shipping it was about half the price of buying a similar box locally, because all my local shops are rip-offs...Sonic can't be beat for price!

So far, everything is great! Only thing that's failing is the window trim on my Pathfinder. X)

40 of 48 found this helpful

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Cuse, NY

Overall
Durability
Value
Features
Design
Usability
Okay enclosure

February 15, 2009

I bought this box because it was a lot bigger than the previous box I was using. I have a Pioneer Premier TSW3001-D2 in this box and it still needs more than 1.8 cu ft to show its true potential. Overall its a good box and it does have good sound quality, but I am not hitting any of those low notes with it that I really want.

41 of 50 found this helpful

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lewisburg, TN

Overall
Durability
Value
Features
Design
Usability
Great value

February 21, 2012

Ive had this box for a good 6 months and havent had any problems. Very durable and built right. Im running an RE 12 and an RE amp in a tahoe and this thing slams! It would be hard to build one for this price. Only complaint i have is that it stinks like they heat treated the mdf or something. My truck smelled like a forest fire for a good month or two.

39 of 47 found this helpful

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Bakersfield, CA

Overall
Durability
Value
Features
Design
Usability
THE BEST

March 24, 2009

This box is the best if you want a ported box. It just has everything you need for a well cheap price but the box is just amazing. I put my kicker cvr 12 and that thing bumps, am definitely buying another of the same box for my other kicker.

42 of 53 found this helpful

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guadalupe, AZ

Overall
Durability
Value
Features
Design
Usability
great box!

March 31, 2014

When I got the box, it was broken at the face plate by the port. It was in the bottom corner. It wasn't too bad so I decided to drop the sub in anyways.
I have an nvx sub in it and it sounds really good. The lows are deep.
Overall it's a good quality box and sounds great

39 of 48 found this helpful

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Winnemucca, NV

Overall
Durability
Value
Features
Design
Usability
Great value!

March 3, 2012

This is a great well built box. I have an RE12" sub in it and it produces the sound that I wanted. Great box recomend to all!

39 of 48 found this helpful

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englewood, OH

Overall
Durability
Value
Features
Design
Usability
nice box for good price

June 15, 2010

product is durable, produces good sound and is a very good deal

38 of 46 found this helpful

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carmichael, CA

Overall
Durability
Value
Features
Design
Usability
great box

June 10, 2010

This box is great and you wont find such a nice one at this price anywhere.

39 of 48 found this helpful

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Wisconsin

Overall
Durability
Value
Features
Design
Usability
Worked well

October 11, 2009

Was used for mtx 9512-44 worked well for what I needed it for...

39 of 48 found this helpful

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Lubbock, TX

Overall
Durability
Value
Features
Design
Usability
One hell of an upgrade

July 4, 2009

went from sealed .8 cubic foot box to this ported box for more volume. the difference was night and day. i have scaled back the gain on my amp and dropped the sub volume to 0 on my deck, and this box still provides so much volume i'm afraid the back glass will fall out. simply unbelievable. fyi, alpine type x and hifonics bxi1606d, 1100w rms @ 2 ohm.

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san diego, ca

Overall
Durability
Value
Features
Design
Usability
not the best for a type r

June 3, 2009

its pretty loud but tends to sound kind of sloppy at some notes. if your new in the audio game i would get it but i wouldnt recommend it. if you want to save a little money id go with a sealed 1.0. on the other hand if you want crazy loudness id go with a building your own ported box or you can find a good prefab tuned at 32-38 hz. but im happy with it but soon to change box.

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McLeansville, NC

Overall
Durability
Value
Features
Design
Usability
works great

February 20, 2015

this box works and sounds great if your sub calls for the air space buy it

38 of 47 found this helpful

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clallam,wa

Overall
Durability
Value
Features
Design
Usability
great box

March 23, 2013

nice well built. only thing it lacks is being pre wired. so you might have to spend a few bucks on connectors. but it is nice. buy it

im running a dvc 12inch pioneer champion series off a fli acid amp its 600watt rms 2ohm mono... bumps

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port saint lucie, FL

Overall
Durability
Value
Features
Design
Usability
Great buy!

August 17, 2012

Matched the air space to my boston g2 12'' sub have no complaints at all
sturdy, clean !

38 of 47 found this helpful

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Antelope, CA

Overall
Durability
Value
Features
Design
Usability
single 12 inch vent ported box

June 10, 2010

Bought this box a while back and must say for the price its a great box. Ive looked at other higher end box's and they are way over priced. Good construction and seems sturdy. I would recommend this box to anyone who wants a single sub system.

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Santa Clarita, CA

Overall
Durability
Value
Features
Design
Usability
Great Box

February 1, 2010

The works perfect. The box is more durable than i thought it was going to be. Just the right size that i needed. I even put some poly-fil inside to enhance the sound of the subwoofer. Great price for a great box!!

37 of 45 found this helpful

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Coon Rapids, MN

Overall
Durability
Value
Features
Design
Usability
box

April 15, 2009

this is a great box, great build quality. great port flow and absolutely no port noise. great box

37 of 45 found this helpful

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sturgeon bay, WI

Overall
Durability
Value
Features
Design
Usability
pleased

February 14, 2012

I bought this to go with my orion xtr pro. it makes the deeps better mids louder and highs annoying. Make sure if you buy this product to tighten the connectors a little more. i put my system together but damn near broke one of the connectors when tightening by hand. Other than that i am very pleased with this product. Sonic Electronix never fails me! I recieved it in three days from KY to WI!

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Humble, TX

Overall
Durability
Value
Features
Design
Usability
Solid box for the price!

April 27, 2014

This is a good solid box for its value, very study and looks decently sharp. obviously there are better boxes out there, but for this price you cant as for much more. i'd recommend it to anyone trying to build a system with out big spending. great product, thanks to sonic for low prices and super fast shipping as always

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grain valley, MO

Overall
Durability
Value
Features
Design
Usability
good box

June 11, 2015

This box does what it says. Make sure to use the right screws as this is soft wood and will strip out.

28 of 33 found this helpful

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Broken Arrow, OK

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Value
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Design
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Box works great.

July 10, 2015

Nice ported box. Helps get those deep tones. Very happy with the product.

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Murrieta, CA

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Nice enclosure.

September 3, 2015

Bought this box and put a Pioneer Champion pro series 12" in it. Only pushing about 400 watts to the 600 watt Pioneer, but sounds nice and clean. Hits the low notes well. I really like the durable gray carpet, (doesn't tear and get dirty as fast as other black boxes I've had in the past). Box is well built and I like that it has pre-filled walls inside.

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Whiteman Air Force Base, MO

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Sounds great

February 24, 2016

I was skeptical at first for I was going to go with the box made by Rockford for my P3 12'' but decided to go with Belva to save a few extra bucks and man I am happy I did. Its not to big and looks great aswell as sounds amazing for my Rockford P3.
Would recommend to anyone interested in this product!

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Ca

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Decent box

October 9, 2015

Id revomend this box for anyone that doesnt need a custom box

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Paintsville , ky

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Great little box !!

June 19, 2019

Kinda small but just big enough a “12 sub to get loud ... Good Buy!!

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Carson, CA

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Very Good!

July 25, 2018

I bought this because a customized box for my Skas vvx 12 was too much. his song great and I feel this is the best option other than customized boxes.

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$city, $state

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Great product

May 10, 2017

This product works great. Sound quality is definitely good, and I would definitely recommend this for anyone who's looking for a ported box.

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$city, $state

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Great value

April 21, 2017

Good box true to size, adds lots of bass for the woofer

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grain valley, MO

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great value

December 7, 2015

This is an awesome box. I have 2 of them holding my twelves. Very loud deep bass. Would definitely buy again.

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Murrieta, CA

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Overall
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Value
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Design
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Nice Box.

September 27, 2015

Well built box. I like the durable black carpet lining. Holds up well and doesn't tear easily like other boxes I've had. Check how much room you have in your trunk because it has a good amount of cubic space. I still have plenty of room in my 07 Honda Accord. Love that it's pre-filled. Have a pioneer 12" champion series sub inside and pairs up nicely with this box. Sounds clean and the lows hit nice.

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Slater, MO

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Features
Design
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Good price and well made

August 10, 2019

I was looking to down grade to a single 12” and this box was a perfect purchase for what I needed with still having space in my trunk for other items.

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Chicago

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Design
Usability
Best bang for your buck!!

August 4, 2019

This box made my Type R 12 pound harder than my last box! Just an FYI It’s slight bigger and wider from the other 12in boxes. But it is definitely worth your money!!!

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Saint Ann, MO

Verified Purchase
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Value
Features
Design
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It's a box

November 4, 2018

works very well with the alpine type-s 12. The only problem I had was the metal plate on the front rattling but it just two screws to remove and the problem was solved

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ROSEVILLE, MI

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Value
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Design
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Awesome Prefab Enclosure

November 19, 2017

This enclosure is made extremely well. It made my NVX VSW124 sound amazing. It looks nice and will turn any subwoofer install into a professional looking setup. I’d buy this or another Belva enclosure and non enclosed subwoofers over a powered or non powered pre-made setup any time. Buy you sub, an amp that meets your subwoofer’s RMS, and the appropriate Belva enclosure, and be amazed. Amazed at not just the sound, but how much you saved over a pre-made setup.

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horn lake, MS

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Value
Features
Design
Usability
Very nice budget enclosure

November 16, 2017

Been running an Alpine tye R in a sealed box for a while and have been OK with it. I have tried this 12 in a couple of other prefab vented boxes and sound quality was terrible. One box was similar in size to this but was tuned way too high and was nothing but boom. The other box was much bigger and tuned to around 32 hertz and was a little better but had absolutely no upper bass and an overly pronounced low bass impact.(very uneven response even after much time spent on setting adjustments) With only a day of listening to this particular enclosure, I have to say it's much more musical and really surprised me. It's blending with my components much better and has the advantage over the sealed box of digging into the very low bass with more authority. I'm hesitant at this time to say it's actually sounding "better" than the sealed box but at this price point you can't go wrong here. Construction is good overall and my box had no cosmetic flaws at all. My recommendation is, if you want a relatively smooth sounding vented enclosure that won't break the bank and looks real nice then this one's for you. Really, at this price point it's a steal and I highly recommend.

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Aberdeen md

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Value
Features
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Great value

August 27, 2017

Works good what I need good price great service great quality

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NC

Verified Purchase
Overall
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Value
Features
Design
Usability
I'm amazed

July 13, 2017

I purchased this box for my friend. He has a 1st Generation Alpine Type R 12" subwoofer on 300 watts and his system honestly scared me because it was that loud. He seemed very happy when I got this for his birthday, and it makes me happy too. Very fast shipping and easy to install. Loved the cotton inside the box as it helps up the cubic feet inside for the sub to operate in. 5 stars.

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Charleston, WV

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Value
Features
Design
Usability
Quality > price, must buy!

June 19, 2017

I bought this for my nephews new civic. He has a kicker CVX that requires 1.8-2.5 cu ft of airspace. I purchased it through sonixelectronics eBay page for 44 w free shipping. Pairs with the sub and matching 300w kicker amp it produces 42hz of clean clear bass. The beauty of ported boxes is that you can get clean low punchy bass with minimal wattage (assuming you make sure your speaker is wired correctly so the resistance matches what your amp can push efficiently). Look up the wiring diagram for your speaker and amp then match the lowest stable ohm possible. Matching the ohms resistance is more important than just getting the most wattage and your system will last longer and endure less stress. Ok now back to the box. It comes carpeted in either black or dark grey and comes with a nice layer of insulation inside which helps produce the low clear bass and the knock behind it. It also comes with a removable manufacturer tag if you don't like the look. The box has really nice terminals that accept banana plugs which I highly recommend, not only do they look nice they make the connections easier. Overall the quality and value of this box far outweighs the cost. I really couldn't get over how nice it was for the price and when I install systems where only one speaker is involved I am now recommending this box if they do not want or cannot afford a custom box. You won't be disappointed with this box, & for any reason you don't like it send it right back to them.

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Oregun

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Durability
Value
Features
Design
Usability
Good box, was looking for something tuned a little lower.

March 24, 2017

Well built box for the coin. I did cut out the polyfil just so the port was clear, but left the rest in. It's got a good universal sound and is a lot more pronounced than the sealed box I had before. I have a 12" NVX VCW dual 4 ohm, bridged down to 2 ohm running a Hifonics Brutus 1000.1D
At max I am getting 700 watts RMS, but probably less. The sub is broken in properly and sounds great in the box, but would hit harder with another 300-500 watts RMS. I have my subsonic filter set to about 25HZ. I think the sub plays a little lower than the box is tuned for, not sure, but I think the lows could be better if the box was tuned lower for the particular sub I picked.. NVX tech recommended 2.25 cu. ft. @ 30 HZ. I will be building a new box when I can and tune it closer to 30HZ with a bigger amp. Like I said, this gets me by fine and I have no complaints!

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Birmingham

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Value
Features
Design
Usability
Nice box

March 23, 2017

I have had this box for about a month now. I am very pleased with it. I have an Orion XTR Pro 122 in it and it's very low notes. I have no complaints

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New York

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Great product

February 23, 2017

Very nice fabricated box, great sound quality highly recommend this enclosure

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Swainsboro, GA

Verified Purchase
Overall
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Value
Features
Design
Usability
Great Box

October 11, 2016

Put a 500 watt sub in this box and wow. It sounded so good playing at any volume. The box is sturdy and good quality. The sub did match up with the box. The polyfill inside the box makes a big differance also.If you have a 12 and need this size cu ft air space box this one will not disappoint.

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Grand Rapids, Michigan

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Value
Features
Design
Usability
Love it!

August 16, 2016

Bought the sub box about a month ago and it was easy to install, no problem with my 12" sub. Looks beautiful and professional and my sub sounds great and non-distorted.

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Arvada co

Overall
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Value
Features
Design
Usability
The best

July 21, 2016

This boc is the best i have gotten in long time from 100w to 50000w .. This thing does it all..looks size design the best tbing about it is the sounds it put out ..good job

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Shreveport, LA

Overall
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Value
Features
Design
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Box

April 11, 2016

The ported box was a good buy. Very convenient with heavy bass.

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louisburg, MO

Verified Purchase
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Value
Features
Design
Usability
awesome box

March 9, 2016

I have a cerwin Vega vmax that I've had in a homemade sealed box for years. It sounded great or so I thought. So I bought this box because I wanted my sub to get louder and wow what a difference. I could not believe what it did for my sub. I didn't change a thing but the box and it slams so hard u can feel it in your body. Could not be happier with this box. Appears to be good quality, mine came with a metal belva name badge at top left of box. They even painted the inside of the port black. Long story short lol, get this box.

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Manchester, NH

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Value
Features
Design
Usability
Free shipping, what????

January 4, 2016

This is a killer buy with free shipping. I used an Infinity 1260W woofer in this and it cranks with only a 200w amp. Place the woofer facing backwards in the trunk and near the back for best bass.

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San Jose, California

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Features
Design
Usability
FORGET THE RE SUBS

December 7, 2015

I've used this same sub box for 4 different brands of subwoofers and they all fit perfectly. This is a GREAT prefab box UNLESS you're wanting to use an RE sub. I bought this box with the RE Sxx and the basket is bigger than the opening of the box, so it won't work without modifications. And the only reason to buy a prefab box is not having to go through the hassle of making modifications. So it's a GREAT box, will be the best prefab you'll find for this price, just DON'T buy it if you're wanting to use an RE subwoofer.

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Parachute, CO

Overall
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Value
Features
Design
Usability
Decent budget box

December 6, 2015

I put a 12" Alpine Type R in this box. The carpet near the port needed a little extra glue to properly hold it down but not a huge problem. The R definitely likes it. Gets nice and loud and the box doesn't have any funny rattles or noises. The tuning is pretty good. Would prefer 34-35hz.

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$city, $state

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Value
Features
Design
Usability
Very good quality sub box

April 17, 2017

Very good bow made with quality materials. The sound is amazing...

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Canada

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Design
Usability
Great box for the price

December 5, 2016

Great box, sounds good and well built/sturdy. Only negative is that it smells really bad.

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San Diego

Verified Purchase
Overall
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Value
Features
Design
Usability
Solid box

November 3, 2016

The box is solid and good quality plus it came with polyfil. The carpet on the box was peeling around the port though. Wasn't enough to me to send it back but still.

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Accessory Tools and Products

Accessories added

NVX XKIT42 - 4 Gauge Amp Kit

Pure Virgin Copper, 4 Gauge Amplifier Installation Kit

Your Price $79.99

Belva BAK42 - 4 Gauge Amp Kit

CCA 4 Gauge Wiring Kit with RCA & Speaker Wire

Your Price $25.99

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 $49.99

NVX XKIT02 - True Spec 1/0 Gauge Amp Kit

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

Your Price $139.99

Scosche WGB12

12" Protective Waffle Style Subwoofer Grille

Your Price $7.99

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 $99.99

NVX SDBP40 - 40 ft. (10% More Than Competition)

40 ft. Bulk Pack of Sound Dampening Material

Your Price $99.95

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 $159.99

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

Product Summary

Manufacturer

Model Number

1SV12G

Weight

35.00lbs

Internal SKU

1sv12g

Internal Product ID

7498

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: Belva Sub Box 1SV12G (Gray)

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Belva Sub Box 1SV12G (Gray)

Single 12" Vented MDF Enclosure

$44.99

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NVX XKIT42 - 4 Gauge Amp Kit

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