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Belva Sub Box 1SV12G (Gray)

Single 12" Vented MDF Enclosure

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List price $99.99

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$44.99

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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

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
25%
3 Star
2%
2 Star
6%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.8
Features
4.6
Design
4.6
Usability
4.7
Luke

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!

7 of 9 found this helpful

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basshead93

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.

5 of 6 found this helpful

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jason

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.

5 of 6 found this helpful

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Star

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.

3 of 3 found this helpful

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Nick

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

5 of 7 found this helpful

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Mario

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.

4 of 5 found this helpful

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Daniel

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.

2 of 2 found this helpful

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Murad

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

3 of 4 found this helpful

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DJ JonnyB

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.

3 of 4 found this helpful

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Christopher

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

1 of 1 found this helpful

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billy

canton, TX

Overall
Durability
Value
Features
Design
Usability
great

April 15, 2014

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

1 of 1 found this helpful

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Jake

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.

4 of 7 found this helpful

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Amerskier

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.

2 of 3 found this helpful

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Greg

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.

6 of 11 found this helpful

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THOMAS

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

1 of 2 found this helpful

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Trent

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.

1 of 2 found this helpful

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Elguanaco

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

1 of 2 found this helpful

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Mark

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.

1 of 2 found this helpful

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Andre

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.

0 of 0 found this helpful

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christopher

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

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 $69.99

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 $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 $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 21 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Cheapest ported box
Marcus B on Dec 19, 2014
Seemed like a good product
Jose L on Dec 5, 2014
This is a good, solid box for what I needed to accomplish. I mounted my amp right to the top. This box makes my Kenwood sub sound great!
Ted E on Dec 8, 2014
Looking for a smaller box. Have a probox now but taking most of trunk space.
Byron D on Nov 30, 2014
how do I wire this box to the sub? those brackets look flimsy and there is not much space on the bolt from the outside connector
A shopper on Aug 10, 2014
Best Answer: Wiring a box isn't that difficult, it's pretty straight forward and there are plenty of videos on YouTube for different ways to wire them up. There aren't any brackets used on this box, the box itself is very well made in my opinion and gives my kicker comp a nice bass note
Reply · Report · David A on Aug 11, 2014
· Add Answer · I Have This Question Too (0)
Will Kicker Comp S sub fit in this box?
A shopper on Dec 30, 2014
Best Answer: Hello ,

Assuming you are referring to either the Kicker 40CWS124/2 ; Yes.
Reply · Report · Customer SStaff on Dec 30, 2014
· Add Answer · I Have This Question Too (0)
Can the polyfill be removed?
A shopper on Jul 30, 2014
Best Answer: Yeah, it sure can. Typically the polyfill is placed in the box with a light coat of spray adhesive to keep it in place.
Reply · Report · Seth WStaff on Jul 30, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

1SV12G

UPC

818060011436

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)