Sonic Electronix Logo

1.2 Cu Ft - Single 10" Sealed MDF Subwoofer Enclosure (Belva MDFS1012)

10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.2 cu ft airspace 10SQTC)

Shop all Belva

• 10" 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• 1.2 Cubic ft Box Volume

Learn more about the mdfs1012
Was $109.99 Details
Thanks , You Pay:


 with warranty

Heads up

We confirm fitment and offer accessories for speakers. Please set your vehicle first if you would like to purchase more than one mdfs1012.

Set your vehicle or Return to product page
Buy any Belva item, Get 10% off another! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
In Stock
Brand new

Buy it now

Acima Logo

No Credit Option

Flexible Lease Payments

Early Purchase Options

Quick Approval Decision

Allstate logo

Keep your product protected longer! Extend the warranty after the manufacturer warranty expires. 

  • Mechanical, electrical and product failure covered! 100% parts and labor covered. (Coverage starts after Mfr. warranty)
  • Easy online management! Zero hassle claim service, available 24/7
Swoosh Icon Icon of Swoosh

For over 23 years, we've been your X-Factor – the team dedicated to having the biggest impact on your shopping experience!

Award winning icon
Award-Winning Service
Shipping icon
FREE Shipping Orders $49+
60 days return policy icon
60-Day Easy Returns
lowest price guarantee icon
Guaranteed Lowest Price
In-House Experts


Belva brand icon

Authorized dealer

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

Built for Bass

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

Belva Subwoofer Boxes are CARB Phase 2 Compliant

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

Belva MDF 3/4-inch Thickness

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

Belva MDF 3/4-inch Thickness

General Features:

  • Single Sealed 10" Enclosure
  • Internal box volume: 1.2 cubic ft
  • High Quality 3/4" MDF Construction
  • Durable black carpeting
  • Pre-lined with Poly-Fil
  • Seams are fully caulked for better efficiency
  • Gold post terminals for clean and easy wiring access
  • Box Dimensions: 14-1/4"L x 17-7/16"D x 12-7/16"H
  • 30 Day return policy

Specifications & Details

Box/Enclosure specifications
Subwoofer Size
Subwoofer Cutout Shape
Round / Circle
Box Type
Number of Subwoofers
Box Style/Shape
Cutout Diameter or Length
Maximum Speaker Depth
Total Box Volume
1.2 cubic feet
Box Volume (Each Chamber)
1.2 cubic feet
Wood Thickness
Number of Terminals
Terminal Type
Binding posts (banana clip ready)
Box Exterior Color
Box Finish
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Customer Ratings & Reviews

5 star
4 star
3 star
2 star
1 star


Customer Reviews

Sort by:


almost perfect

This box is exactly as it should be, connectors are good. But there was a large chip in the box when I got it. Looks like it had been dropped. Not sure where in the process this could have happened. But it is still sealed and works. If it did not have the chip, would be 5 stars.

By Nathan on March 20, 2014


found this helpful.

Great box for the price

The carpet is kinda cheap and thin but I planned on recovering the box to match the rest of my trunk, making this a none issue. The important part was that the box is very well built, solid as a rock, and has the airspace for my cvr10.

By SHMaRiM on October 3, 2013


found this helpful.

quality and economy

I like to make my own speaker boxes. However, it is quite time consuming to make a good one. That's why this is such a good product. It combines quality and economy of time and money.

By Aardwolf on September 4, 2014


found this helpful.

Fantastic product

This box sounds, looks, and hooks up great don't hesitate ! It's holding a PPI 10 at 700 RMS and holds up extremely well no modification required.

By Sloth on June 7, 2014


found this helpful.

Great product, good price

Quality sub box with a good price! Fast delivery . A pleasure doing business with Sonic

By Wayne on May 5, 2014


found this helpful.

sounds great

I'm using this box with a cvr 10 ( because it was a little larger than the minimum recommended volume for my sub . It hits and is clean. I recommend getting it it's basically the same price/cheaper than building one yourself.

Only thing you need is some spray glue to reattach the polyfill you fold back to run the speaker wire from the terminal inside of the box.

By Matthew on September 17, 2013


found this helpful.

I'm impressed, can't beat this box

I recently purchased this box to put a 10" Audiobahn AW-1051T (DVC 4Ohm; 800 peak watts, 300rms) sub in and this box has made my bass ridiculous. I drive a Hyundai Tiburon and coming home from work today the bass was hitting so hard it was tickling the bottoms of my feet. Now that means you've got some vibrations happening. I can't testify for the long term but from initial review you can't go wrong, especially at this price. I would definitely recommend to someone who doesn't want to lose a lot of trunk space for a huge box, but still wants great sound.

By Rachel on May 3, 2013


found this helpful.

Solid Box, Hole too small for RE Audio SEX10D4

I bought this box for my RE Audio SEX10D4 and the opening was 1/16th too small for the sub. I had to break out the jig saw and trim it all around which was a dusty mess and annoying. Besides having to customize the box to actually fit my sub it is a nice box and great for the price. I am sure it will fit cheaper smaller subs just fine.

By David on October 28, 2015 Checkmark Icon Verified purchase


found this helpful.

Good Box

Got this with a combo with a Kicker 10" and it's the perfect size for my trunk. It fits in the back corner and almost takes up no space.

By Clay on February 11, 2020 Checkmark Icon Verified purchase


found this helpful.

Great Box

I have it for a Mtx thunder 9500-1044 and it is taking a beating and still going strong.

By Ira on February 22, 2016 Checkmark Icon Verified purchase


found this helpful.


Similar Products

Best selling similar products

Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS12)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals



Single 10" Sealed MDF Subwoofer Enclosure (Belva MDFS10)

• 0.77 cu ft Sealed Enclosure
• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals



Dual 12" 3/4 MDF Sealed Subwoofer Enclosure (Belva MDFD12)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals



1.5 Cu Ft - Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS1215)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• 1.5 Cubic ft Box Volume



Atrend 12SQL

• 12" Single Medium Pro Series Sealed Subwoofer Enclosure
• Premium carpeted Finish
• Silver Spring Loaded Terminal Cups
• Completely Miter and Dado Panels
• Glued and Braced with Fasteners



Related Searches

MDFS1012 small

Item added to your cart.

Price: $59.99

Essential add-ons
NVX XKIT42 - 4 Gauge Amp Kit

Pure Virgin Copper, 4 Gauge Amplifier Installation Kit



Add to cart
Belva BAK42 - 4 Gauge Amp Kit

CCA 4 Gauge Wiring Kit with RCA & Speaker Wire



Add to cart
8 Gauge - Stinger Amp Kit

Single amplifier 4000 Series complete installation kit.



Add to cart
Belva BAK02 - 1/0 Gauge Amp Kit

CCA Wiring Kit with 2-Channel RCA & Speaker Cable



Add to cart
NVX XKIT02 - True Spec 1/0 Gauge Amp Kit

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



Add to cart
20 ft. of Dynamat Xtreme Trunk Kit

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



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

40 ft. Bulk Pack of Sound Dampening Material



Add to cart
36 ft. of Dynamat Extreme Bulk Pack

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



Add to cart
Banana Clip Terminals

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



Add to cart
Insulated Female Quick Disconnect Connectors

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



Add to cart
Save up to 10 different vehicles in your garage

Identify your vehicle and submodel details
  • Owner’s manual
  • Vehicle’s insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver’s side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon