Customer Ratings & Reviews

OK wire if you like red wire

I received this wire because when I bought my Image Dynamics speakers from Sonic the description said it included speaker wire in the box, but when I received them there was none. I called Sonic and they sent this wire to make up for the error. I later called Image Dynamics and found out that they no longer include speaker wire with their speakers so Sonic if you are reading this you can update your description and pictures on the ID speakers to NOT show speaker wire. For the record I bought the Image Dynamics CTX65cs and the CTX4 speaker sets. Great speakers by the way. Thanks Sonic for all your great products and sound advice, no pun intended:)

Quality Product

Works very well with my Rockford Fosgate sub system in my car.

Giveaway

At the price they are asking,($40 shipped), this is a no-brainer. You'd be very hard pressed to buy the MDF used in this enclosure for the price they are selling the complete box for. Its true 3/4", ( I laid a caliper to it to check), and its advertised dimensions and airspace are spot on.

good deal!

Pretty decent value for the price. Worked out great, thanks.

Great bass

Bought this for an old punch 2 I had sitting around that I put into my sons car. Previously it was in a small truck box for an s10. Couldn't believe the difference that this box made. The sub is getting 200 watts from the little fosgate amp that I had for it but it is twice as loud as it was in my truck with no distortion. Obviously I had it in way to small of a box before. I got one happy kid though.

solid box

Solid box had one screw that didn't grab anything must of hit a soft spot in the wood other then that solid box

Usable

The wiring has done me right so far but the only thing I don't like is the speaker wires. You have to carefully split it so the wire doesn't show. Other than that minor thing everything was great and a great value!

A winner

This is just what the woofer doc ordered. The poly fill is already installed. The black carpet looks great. I'm installing a Rockford T-1 dual 4 ohm 12 in the box. I'm anxious to hear how this is gonna sound in my Mark VIII.

Exactly what I needed.

I purchased this box to house an Alpine type E sub. I had originally intended on building my own box, but after looking around at the prices of MDF, I found this box, I literally couldn't purchase the materials cheaper than buying this. It's sturdy, and is a perfect match for my sub. I am extremely pleased with my purchase, and would recommend it to anyone looking for a very well built, sealed, enclosure.

Good box!

For a pre built box it does the job very well! The poly fill is useless if you need a bigger box just order a bigger box... No leaks what so ever. I did replace it for a custom built ported box.

price is right

the price is right for this setup. the ground wire and the power wire are to big for my amp but i made them fit. better to have to much than not enough so if i upgrade to a larger amp it will be fine.

nice sound

very good product at a pretty good price lowest i could find on net and sounds good

Great price

I'm running a rockford fosgate p2 in it. This box has held up great. i can hear a very small leak but only when I was checking for leaks. Otherwise it was inaudible from even a few feet away. Being 100% sealed is very crucial considering it is a sealed box. But overall id say that this is a great box. Cant beat the price. Nothing a little silicon cant fix.

SEALED ENCLOSURE

Yes its a prefab box, it is constructed very well with .75" MDF. Solid no leaks.Carpet well done.Looks nice. Just match the air space you want for your sub and your done. I could not build this for the price i paid, so its a no brainer for me. If i was looking for ported or vented i would build one myself because of propper tunning. Just wanted something simple and this exceeded my expectations.

Awesome price and fast shipping

Very nice for the money. You can't go wrong with this box. Very nice craftsmanship. Does not come pre-wired though. More than enough poly fill though and very durable carpet.

Nice Touch!!!

This box has bundled with the NVX 12" VSW sub and it does some good bass! Well crafted, quality carpet, more than enough polylester. It doesn't come pre-wired though, but since it was a free bundle... I could careless!

Accessories for product

Just what I needed and made installation so much easier. Thanks

awesome products

I run 2 12inch audiobahn exursions on this amp and it pushes them very well. The size is perfect not to big and fits right unerneath the seat or small space. The best part is it stays pretty cool even after running most the day.

good wires

I like the wire kit I got with my amp it seems to be holding up goo it handles the power of the amp I got but I would of gave it 5 stars all the way around but I wold of like the ground at less 2 more feet for good use but over all its a nice kit

Good stuff

Great product last a long time good value for the money.

Cable

Good product fast shipping awsome seller... keep up the good work.....

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

Looks good, well built, and when paired with an appropriate subwoofer for the airspace specified it sounds great!!

decent box

I bought this box to house a 122x MOFO, which is kind of a tall order. The box is pretty thick and definetly acceptable for the price. Definetly plain jane. I wouldnt exspect it to stay perfectly sealed for more then a year with the sub I was useing but held up just fine for the 3 months I used it. Pretty good for the price and would definetly survive for a long time without any abuse.

Use to purchase this all the time

Belva brand is good affordable material when starting out but through out time cca corrodes if you have the money buy ofc cable

Solid Box

I use a JL Audio W3 in this box. It is firing to the rear in a Honda accord coupe. The sub has about 350 watts running to it. The box is very well built. The sound from it is perfect. I am very satisfied with my purchase.

Seems very well made

I have a 2700w on a 3400w amp installed on this Subwoofer Enclosure and play it very loud all the time and still no air leaks. This box is Big in the inside, looks like a mini tunnel. The Poly Fill is pertty well laid out, you will have to move a little out of your way to access the Speaker terminals but trust me its no big deal at all. Since the box is so big for a single box, it does not move around trunk nearly as much as smaller single boxes. Had it about a month and two weeks since the time this review was written.

Belva MDFS1215

This might be one of the best non-custom sub boxes that I've ever owned.

RE Audio SX12 + Rockford T5002

Decent subwoofer enclosure

I wish it was a little smaller since it is a sealed enclosure. But it does put out a nice sound with the poly fil.
I'm sure you can find better, smaller boxes

Good product

High quality material, convenient, and super easy to install. Looks good too.

Just do it!

I totally expected this box to be a temporary solution to be replaced later by a "real" box. Well, I like it just the way it is. Won't be building that "real box" anytime soon! I have a Massive Hippo 122 and 3600 watt amp, so I expected the box to explode at some point, but it hasn't and it sounds great! Thick, heavy, tight, clean, handsome, cheap!!!

Perfect kit

Comes with everything you need. Works good with my 800w system

By Chad on May 14, 2020 Verified purchase

Good extra fine wire

This is excellent speaker wire. One wire has round insulation while the other has square insulation making it easy to identify hot and grounds. My only installation problem was I didn't order enough. I needed a quantity of 2 just to wire a single cab pickup.

Good wire

This wire is great speaker wire. I like the way it looks and works great.

Excellent value

The speaker wire is a good price for the length and gauge.

Good product

Very nice box, and well built. I have a memphis c3 sub, powered by an alpine mrx-m110 @2ohms. I have only had it for a short amount of time, but it hasn't fell apart. So I'm satisfied. Would buy again.

Good deal.

I purchased this for the value. Everything you need for a simple single amp install in one package. Good quality with good value, thanks.

Great Value Kit!

I would highly recommend this package to anyone looking to do a cheap install, i have friends who got these before and its nice, simple and cheap!
Never had any issues, great value!

By Craig on October 15, 2016 Verified purchase

Ok. not the best kit.

The eyelet connectors are flimsy and the speaker wire is hard to separate. When it does it exposes some of the copper. Otherwise the kit is ok.

By Lloyd on December 10, 2015 Verified purchase

Ok value

Good product , but not enough speaker wire to wire two front door speakers in a scion xb. I guess it would have been enough if I had run one of them with the power wire instead of running on the other side of car, but everybody knows that's a bad idea due to engine noise. You would think they would take that into consideration. Also not a big fan of the square and round speaker wire very hard to separate and strip without exposing bare wire.

Great value

Does the job does what it needs to do. It was packaged nicely.

You get what you pay for....

Bought this kit for my 650 watt rms amp. Not true awg 4 guage, but close.jacket is pretty thick.all wires flexible. Reached under the back seat of my 2008 silverado crew cab. But not a whole lot of slack if your going to a trunk. Fuse is ok... ive seen better and worse. Bottom line, if your on a budget and running 800 rms or under, this will work fine.

By Trevor on June 8, 2016 Verified purchase

Awesome box

Its a good box as expected. I've owned other Belva MDF boxes. Sounds great with my setup. Would buy again.

By Franklin on August 12, 2015 Verified purchase

Great wire

Ran wire though firewall with ease m, and is powering my 1500 RMS amp no problem.

By Carey on March 12, 2020 Verified purchase

Belva BAK42BK (Black)

Great prices on great equipment and Fast delivery thanx sonic

By Anonymous on March 6, 2019 Verified purchase

Great value

Bought it to try out but is a really good power rating and not cheaply made for price and is really flexable

By Paul on October 17, 2017 Verified purchase

Great price

This kit has a great price. Everything in the kit seems to be great quality much better than expected for the price. Very fast shipping. Everything you need to do a amp and sub install. Will be ordering more.

By Deek on December 20, 2019 Verified purchase

Excellent product

Very nice love what I got came two days early couldn’t ask for more

By Anonymous on June 4, 2019 Verified purchase

Perfect!

Was surprised with the quality of the copper and actual size of the wires compared to other cheap brands like Schoshe. Worth every penny.

wire kit

I have used sonic for years and all their products worked as promised, knowledgeable staff, very good prices and you can depend on their products stats being correct including watts and specs!!

steve

By Steven on July 22, 2020 Verified purchase

Good kit

Basic kit to get you going. Speaker wire needs to be just a little better.

By Anonymous on March 25, 2019 Verified purchase

Great package

This kit had everything I needed to complete my installation. Great product.

By Tony on December 15, 2017 Verified purchase

Great wires!!

After reading reviews and most importantly watching the video Sonic posted with this product, I decided to give it a shot for my Cerwin Vega VPAS-12. The wires are exactly as described, true 4 gauge, not all insulation like the other brands. The fuse block is solid and easy to set up. I was worried it may not fit the VPAS connectors since they mention 8 gauge, but it works and it is holding in no problem.

The only thing I did change was the actual battery and ground terminals, they seemed weak, so i chose something stronger and all is well.

Thanks again Sonic!!

By Fabio on March 16, 2020 Verified purchase

Good value

This a good box for the money. can't be beat for me being that it was free with my speaker purchase

Cons: some of the carpet material was peeling off when I opened it. Can hear some resonance with higher bass notes. Terminals are a bit cheap.

If you can't build your own go ahead and purchase it

This is coming from some one who has built boxes and installed many systems.

Decent Product

Works very well, wish it included longer zip ties but overall a good kit that has true 4 gauge wire!

By Lachlan on April 8, 2020 Verified purchase

very satisfied with this enclosure

i usually build my own enclosures, however this deal was too good to pass up on, especially since it was exactly the volume that i needed. buying instead of building was a huge time saver for me and i didn't have to clean saw dust off of everything in my garage. i would not hesitate to buy another Belva enclosure again. great product ! ! !

Can’t beat this

Great box for a steal of a price. Haven’t noticed any leaks and Sonic got it to me super fast!

Good box

It performs just fine. The port is pretty cheap so I replaced it.

Very well made products

For the price, this installation kit is great. You can spend 4 times the amount for killer connections but if budget and functionality are key, this is the best.

By JAMES on June 9, 2020 Verified purchase

Great valule

Great quality wire, plenty enough for the job. Works great and made my install a breeze.

By Josh on January 11, 2020 Verified purchase

Wired out

Great product, great price does excalty what I needed it to do... would recommend for anyone who needs to get there AMP hooked up properly.... comes with everything you need to do the job right

By Edward on February 18, 2020 Verified purchase

What's "budget" about it?

Great sealed enclosure, and the poly lining is a nice touch. No leaks. The carpet is darker (blacker?) than most automotive-grey boxes. Didn't strip any screws during install. The nameplate (on the front! they're really proud of it) is a little obnoxious and attaches with small screws, which may create a leak, so I took the plate off and put the screws back in their holes. Terminal binding posts are what you'd expect and were tight. Overall just what you'd expect for a carpeted, sealed enclosure at a great price.

By Thorn on March 29, 2018 Verified purchase

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

Fits in my Camaro perfect and makes my 12s sound better.

Great Box!!!

If you need a no hassle ready to go box n a hurry.Really good sound quality. Well made Also.

By Anonymous on December 16, 2018 Verified purchase

Great for deep low hard hitting bass

These boxes are built extremely well and hit very hard. If you want to hit those low window breaking notes these can take it. I have 4 of them and have never had one problem.

By Jasen on November 9, 2017 Verified purchase

Good box

Got this one with a 12" NVX sub. Looks to be well constructed and should work out just fine. Could not build it for what these cost.

By Brandon on September 17, 2016 Verified purchase

Sealed box heaven!

Bought this for a 12" JL w3. Replaced a lager ported box that took up too much room in the trunk and was hard to tune for an overall flat system response. Ported gives you quite a bit more bass around 30-60hz but between 100-180hz it sounds horrible And if your crossing over around 125hz and want flat response, sealed is the way to go! This was a great bargain. Sturdy, light and perfect amount of airspace. I was worried that it was like .125 over my specs and had a small layer of dampener but in the end I just slapped it in and started tuning. Glad I did, sounds great!!!

Great product

Good box but a little pricy.I would recommend shopping on this site

Wow, nice box for the $$

Extremely nice box. Fit and finish is great.

Again. Very Nice box for the money.

Very solid and well built.

Highly recommend it for the JBL cx 1200. I used two for my home theater as near field subwoofers.

Excellent Pre-fab. box! (12" Champion Pioneer sub.)

Made very well and sturdy with true spec. high quality wood. Nice gold plated terminals and the inside is truly lined with poly-fli, glued securely, solidly sealed with no leaks. Does have a logo screwed to the front which at first I didn't like but has grown on me. I have attached my sub. amp to the back of the box and has held up very well. I trust in the build and plan on attaching another small amp to the top of the box as well. Fit almost perfect for a 12" Pioneer Champion sub (I suggest lining the front and inside wall with gasket tape for a more sung fit). I un-screwed the speaker terminals and put a little gasket tape around it to seal it better to the box. Highly recommend this box. Feels like you could drop it and would still hold up.

By S-Dizzle on November 2, 2017 Verified purchase

You cannot build a better quality box for cheaper

I can't believe how much of a steal this box is. Very solid, sturdy box with attractive carpeting and even polyfil on the inside walls. Bought it for a Type R 12 and it sounds VERY good. Hits the lowest note in Young Jeezy's "Put On" easily! Never seen a sealed setup do that. If you're going sealed then buying this box is a no-brainer.

Deep bass, solid box.

I'm running a 12 inch Kicker Comp in this amd let me tell you, This is the deepest sounding sealed box I've ever heard. I had one from Best Buy that was a little bit smaller than this 1 and it doesn't even come close to being as deep sounding as this box. Honestly I prefer two of these boxes over my old double ported box I had. The build quality is outstanding. It's glued all the way around and there are no leaks. I shopped and compared boxes for quite a while and you're not gonna beat this one.

By nick on May 11, 2016 Verified purchase

Great Box at a Great Price

I bought this sub box to house my NVX NSW124V2 (12" 4-ohm DVC) subwoofer. I use the NVX JAD 900.5 5-channel amp to power the sub. Wired at 2 ohms it gives me 440+ watts. The sealed box really puts out bass that's powerful, tight & accurate. After 30 days I haven't noticed any deterioration with the build. And I have been slamming my system so I could check speakers/amps/etc. The sub itself calls for a 1.25 cu ft space so this box works out perfectly IMO. Highly recommended.

By NolesAndSteelers on December 26, 2015 Verified purchase

Great Sealed Box!

Own 2 of these bad boys already.
Pros: Strong constructability, clean fabrication. Will definitely by a 3rd one, and would recommend to anyone who plans doing a single sealed woofer in their application.
Cons: None

By Anonymous on July 15, 2019 Verified purchase

Good

Well built box, very fast shipping! Good for deeper subwoofers.

Belva 12" Enclosure

I bought this as a package that came with a JL 12" sub. The box is well made and fits perfectly in a 2016 Jetta. Items that should be included with the box are a 2-foot length of 10-gauge speaker wire and 8 wood screws.

By Ferdinand on March 27, 2020 Verified purchase

Great value and built well

This is the third one of these enclosures I have purchased from Sonic Electronix and all three have arrived quick and packaged well. Would not hesitate to buy another and I consider the Belva line of prefab boxes a "best buy" in each class whether it be ported or sealed.

By Jeff on February 27, 2018 Verified purchase

Perfect for what it's advertised as.

It's was the exact dimensions for the sub intended, looks good (other than the silly belva aluminium badge that was easy to remove) and has held up to an 800 watt rms sub thus far. Great for standard sized 12s though needs a little trimming for slightly oversized baskets.

heavy duty

High quality and integrity - it worked perfectly for my needs

By henry on December 16, 2016 Verified purchase

Quality enclosure awesome look awesome price

This box is well made its perfect size and shape surprisingly light I would definitely recommend it to anyone

Great product

For the price it is a no brainer... simply one of the best boxes I’ve used. Usually go with a ported box but this sealed box pounds my 12” pioneer champion series.

By Anonymous on November 15, 2019 Verified purchase

Awesome, Crisp, Clear

This box pairs with my Alpine R 12D4 sound great. The box sounds clear and crisp. No distortion and build quality is excellent.

Good prefab box

Purchased this box for a home subwoofer and have no regrets. If you need a sealed box with this internal airspace I don't think you will be disappointed. Great cost effective sealed box and of course with Sonic Electronix you get lightning fast shipping.

By Jeff on February 27, 2018 Verified purchase

Quality built box

I own three of these boxes and am happy with the sound and quality of the box.

By Shane on February 12, 2023 Verified purchase

12" MDF sealed box

I love these boxes..strong well bulit and can take the SPL for serious subs. And the price wont break your wallet..highly recomend!!

By james on January 17, 2020 Verified purchase

Everything I Needed

Used this kit to run an amp to the trunk of a 2015 Kia Optima. Ended up trimming about 1½ft of excess to help clean up the install. Everything seems to be good quality. Ran the power wire down the driver's side and RCA & amp signal wire down the passenger side to avoid any interference. Plenty of length of everything for a full size sedan.

By Andy on December 28, 2023 Verified purchase

Good kit for the price

The power and ground wire are fine , speaker wires are interesting. One side has square and the other is round which makes it very easy to know what you hooking up to what. Came with everything it was supposed to.

By Daniel on September 12, 2024 Verified purchase

Good quality speaker wire

Received with my order. Very good quality speaker wire

By Josh on October 7, 2024 Verified purchase

Love there stuff been back several times will order everything I need form them

By Jerry on August 10, 2024 Verified purchase

Great value

Works awesome I really enjoyed it and it was easy to install

By Nathanael on September 7, 2024 Verified purchase

awsome

sonic did it again . we love them

By roy coffey jr on August 4, 2024 Verified purchase

Amp kit

Everything you need for a basic set up

By Mahaish on May 11, 2024 Verified purchase

nice

this amp kit surprised me how nice it was with the proper wires for the job

By Michael E on October 3, 2025 Verified purchase

Nice quality

Wired a 4 channel amp up with this wiring kit. Good quality wire and looks really nice

By Ron on May 18, 2025 Verified purchase

Great promo item

I got this item as a promo for buying my amp. Has everything you need. I would've preferred it to have a red power cable and blue remote wires.

By Aaron on January 15, 2025 Verified purchase

Heck yes

Sonic gave this to me with an order. What more to say.

By Tyie on June 2, 2025 Verified purchase

Free amp kit

Normally I use OFC but this kit was free for a starter system and has been running good since install. Wires are nice and flexible, lightweight and pretty well jacketed.

By Chris on January 11, 2025 Verified purchase

Sold box Well built

I love the dark black covering. For me it is more appealing that the drab grey. Nice design and solid. Nothing bad about this box.

By David on October 15, 2024 Verified purchase

Quality Sub Box

I bought 1 ten inch box and 1 twelve inch box . Both are mabefrom 3/4 in MDF .No cheap 5/8 . They're solid as a rock and work great with Rockford Subs . Don't look for cheaper .spend a bit more and get these

By Fred on April 11, 2024 Verified purchase

Just Buy It!

Nice kit and good price. I’d buy it again.

By Benjamin on December 28, 2025 Verified purchase

Great Value for a Solid Box!

I was pleasantly surprised by the quality of this box, as this is my first attempt with Belva products. The carpeting was neatly placed, thick 3/4" MDF, which is honestly unheard of at this price point, and it fit my trunk opening under the rear deck of my 09 Camry. I also appreciate the gold plates screw terminals as opposed to push terminals. Makes for a much more solid connection and adds to the longevity of the box. If you want a sealed 12 box and most of your trunk space left, this is the one!

By Timothy on October 29, 2024 Verified purchase