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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)

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List price $99.99

You Save: $45.00 (45.00%)

$54.99

with warranty

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Arrives by Thursday, Mar. 5 to zip 98144

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Bundled Savings with this Product

50% Off Subwoofer Grill with Purchase

50% Off 12" Bar Style Subwoofer Grill with the Purchase of a Belva Enclosure. Simply Click the "Add Both to Cart" button to the right. This offer cannot be combined with any other coupons or offers.

7.00

19279

445

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

$54.99

+

50% OFF

GS Audio BG-12

$13.99

Special Price $6.99 ($13.99 if purchased separately)

GS Audio BG-12

Grille fits most round 12" Subwoofers • Keep your Subwoofer Safe from Accidental Damages with this Amazing Grill • Sleek Aluminum Finish

50% Off Speaker Wire with 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.

5.00

19279

401

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

$54.99

+

50% OFF

Belva BBSW127

$9.99

Special Price $4.99 ($9.99 if purchased separately)

Belva BBSW127

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

FREE Sub Box with select Kicker Subs!

When you buy this Kicker subwoofer, you qualify for a FREE 12" ported subwoofer enclosure.

54.99

69519

303

Kicker 40CWRT121 (CompRT121)

$189.95

+

100% OFF

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

$54.99

Special Price $0 ($54.99 if purchased separately)

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

FREE Sub Box with select Kicker Subs!

When you buy this Kicker subwoofer, you qualify for a FREE 12" ported subwoofer enclosure.

54.99

69520

303

Kicker 40CWRT122 (CompRT122)

$189.95

+

100% OFF

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

$54.99

Special Price $0 ($54.99 if purchased separately)

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

(Offer 1 of 4)

Combined Total Price

$61.98

You Save $7.00

 

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 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
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
Not warranted
Labor Warranty Duration
Not warranted
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
67%
4 Star
21%
3 Star
8%
2 Star
2%
1 Star
2%

Average Attribution Rating

Durability
4.5
Value
4.7
Features
4.5
Design
4.5
Usability
4.7
Bryan

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

9 of 16 found this helpful

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Rick

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.

9 of 17 found this helpful

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Edward

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.

4 of 7 found this helpful

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Alex B.

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.

9 of 17 found this helpful

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Josh C.

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.

3 of 5 found this helpful

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Jamiere l

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

3 of 5 found this helpful

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Muck

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!!

11 of 21 found this helpful

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justin

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

1 of 2 found this helpful

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eduardo

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

1 of 2 found this helpful

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Matt

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.

2 of 4 found this helpful

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Trevor

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.

8 of 16 found this helpful

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Luke

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.

8 of 16 found this helpful

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Jeff

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.

8 of 16 found this helpful

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Joe

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,

6 of 12 found this helpful

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Erik

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.

6 of 12 found this helpful

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nathan

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

6 of 12 found this helpful

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KING CHARLES

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!

4 of 8 found this helpful

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Trenton

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!!!

3 of 6 found this helpful

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BassHeadDan

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...

1 of 2 found this helpful

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Lizzard

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

0 of 0 found this helpful

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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 $89.99

Belva BAK42 - 4 Gauge Amp Kit

CCA 4 Gauge Wiring Kit with RCA & Speaker Wire

Your Price $29.99

8 Gauge - Stinger Amp Kit

Single amplifier 4000 Series complete installation kit.

Your Price $39.99

Belva BAK02 - 1/0 Gauge Amp Kit

CCA Wiring Kit with 2-Channel RCA & Speaker Cable

Your Price $59.99

Scosche WGB12

12" Protective Waffle Style Subwoofer Grille

Your Price $4.99

GS Audio BG-12

Chrome Bar Style Grille for 12" Subwoofers

Your Price $13.99

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 $44.95

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 $109.95

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

40 ft. Bulk Pack of Sound Dampening Material

Your Price $119.99

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 $164.95

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 $7.99

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 $6.99

Car Stereo and Speaker / Subwoofer Installation Tool Kit

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

Your Price $14.99

Browse 4 questions and 24 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Price and box volume
mark h on Feb 1, 2015
i have 2 12"s but one is fucked up and makes a slapping noise when it plays, so i needed a 1 12" ported box and this one seems durable and for the best price.
jacob u on Jan 30, 2015
cheap
Jason M on Feb 1, 2015
Improvement over current box.
Chad M on Jan 28, 2015
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 800w@2ohm 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)
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 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

UPC

818060011429

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)