Expert Service 1-877-289-7664 [Hours]

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)

In Stock
|

List price $99.99

$54.99

with warranty

You Save: $45.00 (45.00%)

Arrives by Tuesday, Sept. 9 to zip 98144

Add an Extended Warranty

Fast, Free Shipping

Within the US 48

60-Day Money-Back

Hassle Free Returns

Low Price Guarantee

Seen it for less? Click here

365-Day Coverage

Warranty assistance for a year

In Stock

Arrives by Tue, Sept. 9

Get FAST answers from customers ASK a Question See questions answers

Bundled Savings with this Product

Save 20% on a Trunk Sound Deadening Kit!

Get rid of the rattles and improve your ride! Save 20% on the Maxxlink VSD-TK Trunk Sound Deadening Kit when you purchase a select Subwoofer Enclosure. This offer is only good for a limited Time!

14.00

19279

640

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

$54.99

+

20% OFF

Maxxlink VSD-TK

$69.99

Special Price $55.99 ($69.99 if purchased separately)

Maxxlink VSD-TK

• Eliminates Road Noise
• Reduces Rattles
• Heat Insulation
• Five 18" x 32" Sections
• Butyl-Based Material

25% off a Matching Box w/ Sub Purchase!

For a limited time receive 25% off a matching ported subwoofer enclosure when you buy select Kicker subs.

13.75

66618

453

Kicker 40CWR122 (CWR122)

$149.95

+

25% OFF

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

$54.99

Special Price $41.24 ($54.99 if purchased separately)

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

25% off a Matching Box w/ Sub Purchase!

For a limited time receive 25% off a matching ported subwoofer enclosure when you buy select Kicker subs.

13.75

66619

453

Kicker 40CWR124 (CWR124)

$149.95

+

25% OFF

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

$54.99

Special Price $41.24 ($54.99 if purchased separately)

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

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.

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.

7.50

19279

401

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

$54.99

+

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

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)

FREE Sub Box with select Kicker Subs!

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

54.99

21915

303

Kicker CVX122 (10CVX122)

$299.95

+

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 8)

Combined Total Price

$110.98

You Save $14.00

 

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
20%
3 Star
9%
2 Star
2%
1 Star
2%

Average Attribution Rating

Durability
4.4
Value
4.7
Features
4.5
Design
4.5
Usability
4.7

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!!

2 of 2 found this helpful

Help our customers find the most helpful reviews

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.

1 of 1 found this helpful

Help our customers find the most helpful reviews

Damian

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Alvin

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ernest

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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

0 of 0 found this helpful

Help our customers find the most helpful reviews

Matthew

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ron

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Alexandro

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Lunchbox

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

0 of 0 found this helpful

Help our customers find the most helpful reviews

Chris

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

blakk

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Bradlee

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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,

0 of 0 found this helpful

Help our customers find the most helpful reviews

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Christopher

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.

0 of 0 found this helpful

Help our customers find the most helpful reviews

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

0 of 0 found this helpful

Help our customers find the most helpful reviews

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

NVX XKIT02 - True Spec 1/0 Gauge Amp Kit

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

Your Price $149.99

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 $159.95

Banana Clip Terminals

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

Your Price $3.99

Insulated Female Quick Disconnect Connectors

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

Your Price $7.99

Spring Post Terminal Cup

Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

Your Price $3.99

20 oz. Bag of Poly-Fil

Polyester fiber fiberfill adds better bass to your system.

Your Price $5.99

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 $12.99

Browse 1 question and 1 answer
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
the only thing they offered close to airspace needed
Ron M on Aug 28, 2014

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)