Customer Ratings & Reviews

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.

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

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.

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.

Good solid product

It is not easy to find good quality heavy guage(10~8 awg) speaker wire. You will not find products like this one at your local Best Buy. With 8awg silver tinned copper as the conductor, I don't think there's anything better out there for the price. At the time of this review, I was able to purchase 20ft of this cable for $50 on ebay. At that price point, if needed, I would make this purchase again in a heart-beat. If you are interested in this product, buy without hesitation. And, to the manufacturer: please do everything in your power to keep supplying us with this quality product for the same price!

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!

It's speaker wire built with quality

This is very definitely not cheap wire. Flexible, no corrosion so far, great power delivery and looks good with a premium feel. Not much else to say about speaker cable.

Good quality

This is the best power cable, it flexed like a charm.
Buy it you will not regret it.

Good quality

This is the best power cable, it flexed like a charm.
Buy it you would not regret

Great Product !!

This wire is silver tinned IFC and is true to spec. Heavy duty jack and a high strand count for easy installation. Best wire I have ever purchased!
High Quality!.. I will Buy again for sure

best speaker cable ever!

By far the best speaker wire I have ever used. I'm running it fome my kicker 300.1 ( just a filler until I get kx 1600.1) to my dule kicker comp r 12" and those things ate now hitting so much harder, its like the wire game me like 50rms watts more! If you want a high quality high flex cable this is the one.

Great quality wire

This wire is so big, unfortunately I had to cut a few strands out to fit into my speaker terminals on my DC xl. I suppose it's not bad to have to much rather than not enough when it comes to wire size. I've always been impressed with NVX and their products. This is no exception.

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.

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!!!

Expensive but WELL worth it

I was hesitant to spend $50 on mere speaker wire, even if it was 8 Gauge. I will say that after installing it I am extremely satisfied with it. It is a great quality wire, very flexible, and easy to work with. Now I can rest assured that my Subs are getting every milli-watt my amplifier throws to them.

By Newton on June 12, 2015 Verified purchase

nvx cable

awesome product only thing I don't like is the fact that one side of the wire is square so doesn't make it easy to work with overall great product

By rafael on September 17, 2015 Verified purchase

NVX XWS0820

Exelent wire do the best performance on speaker audio performance

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.

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

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.

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 ! ! !

NVX BABY!

these guys keep it real with high quality products! y e to the a

nice OFC wire

quality made speaker wire for my application clean & flexible hope Santa brings me more lol

By Anonymous on September 30, 2018 Verified purchase

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 transparent

I build 3 or 4 sets of speaker cables a year for my home stereo system in search of better sound. This wire rivals my best wire from many years ago.
This wire has a very transparent sound, lots of "air" It reproduces bass very cleanly and, not too much or too little. It accurately lets me hear the sound of my 1970's Mullard tubes on strings and horns. A very well balanced cable that punches way above its weight class. Highly recommended !

By Anonymous on September 25, 2019 Verified purchase

Highest quality

I purchased this to match my 4 runs of NVX 1/0. I've seen many other brands and only a few compare. Super flexible and they look great!

By Anonymous on November 18, 2018 Verified purchase

Great Product

Very good speaker wire. Hard to find this quality in any other place other than a real audio supply shop.

By Scott on January 12, 2023 Verified purchase

Great product

This is true to AWG specs and has a high strand count. Perfect for sub wiring. This could also be used as power cable for a 500 watt amp or below. Will buy again!

By Erick on August 26, 2020 Verified purchase

Great value

While they are on the bigger side for speaker wire, it allow the full current to flow without interruptions or generating heat.

By Garrett on August 9, 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

Tom Drummond

Some of the best wire I have found highly reccommended

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

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

Great OFC

I chose NVX for all my wiring needs; from the silver tinned OFC for power, ground, and speaker wires, to the RCAs. After my research, these were the wires to get; and the pricing here is great.

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

Great wire 4 Tha PriCe!

Was definitely pleased with how well this wire runs my Four BoSs AuDio 12's to my 5,000 watt amp.. THiS WiRe RoCKs My CHeVy S10 My wife is Waitin for Windows to BLoW lol... Definitely a DeaL For YoUR DoLLaR with this Wire..

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

Chunks Deluxe: aint no skimping on the chocolate chips

Quality is the first thing that comes to mind when holding the wire in hand. the jacket is durable yet flexible. not super stiff like more plasticized jacketed wires are. when trying to stuff these into a ferrule decided to compare total conductive dia to an old tsunami 4g Amp Power wire, and they are pretty dang close. Way to go NVX! your 8g wire for speakers has nearly the same conductive diameter as Tsunami 4g power wire. UNGH!
Great value, fantastic performance. upgraded from some over spec 10g cause my terminals weren't stuffed to maximum capacity. LOL.
bottom line is this speaker cable aint no slouch. nice thick wire to carry a fat load of power to your hungry woofers.
The spring terminals on my Belva 4 Ohm DVC 12" couldn't accept the wire 8g ferrules. resorted to stuffing the naked wire in the terminals. we all know how frazzled wire can get when trying to insert into something just a smidgen bigger in diameter.
Its not the wires fault that the terminals are too flipping tight.
Thanks Sonic for carrying this NVX Chunk deluxe, aint no skimping on the chocolate chips, gauge speaker wire.

By Dylan on October 13, 2022 Verified purchase

sub wiring

big subs get the wire and this was a perfect match

By James on January 11, 2020 Verified purchase

8 gauge speaker wire

Absolutely the best speaker wire A+ I will be back to shop

By Anonymous on September 21, 2019 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

I trust all my Car Audio Wiring needs to NVX now

8 AWG speaker wire. WOW! This stuff is impressive. I don't currently have a system that would need such wiring for a Subwoofer but in the future, I might and I wanted to snag some of this good wiring before they might not sell it anymore. All my other wiring throughout a few cars is now NVX and I am 100% satisfied. Highly Recommended!

By Chase on January 2, 2023 Verified purchase

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.

Good buy

Its true too spec 8 guage wire good stuff just like every other nvx product

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

Great Value

I received the wire for free with a purchase of a 10” alpine type R so I used it to wire the sub and I am not disappointed.

By Brennan on January 17, 2020 Verified purchase

NVX 8 ga speaker wire

NVX 8 ga speaker wire is very flexible, and also has thick insulation. Very good wire, i would recommend it to anyone looking to maximize their subwoofer amplifier output.

By Joseph on December 20, 2019 Verified purchase

Great Product

Always great products with speedy service! Thanks again for the positive experience.

Great value

I got this at a very good price and the material looks really good as well nice and thick wish shipping was a little faster .

By Anonymous on April 24, 2019 Verified purchase

great wire

this is great wire you don't realise how large it really is till you get it. it also has a nice heavy weight to it

NVX XWS0820 8 Ga. Speaker Wire! Nothing better!

Wow, I really like this speaker wire. Perfect for my Subs. Shaped jacket makes it easy to tell which wire your working with. Great Value product from NVX.

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 for Subwoofers!

I can NEVER find this stuff in stock anymore! So, a lot of people ask me why I need such large speaker wire to my subs. Two words: damping factor. Damping factor is the amplifier’s ability to send the current generated by a subwoofer when it continues to move after the signal stops back into the voice coil to STOP the cone. Just like a shock absorber on your car. It has nothing to do with current flow or heat. It has to do with linear resistance and the fact that damping factor for the subs can be thrown off by mere thousandths of an ohm in linear resistance of the speaker wire. Most people really wouldn’t notice a difference because of the music they like. Rap/Hip Hop/R&B will never see a difference. It also depends on the amplifier as well. Most amplifiers don’t have a very high damping factor. I run Alpine PDX amps which have a 4-ohm damping factor of >1500 at 4 ohms, >750 at 2 ohms. For rock/metal like I listen to, this makes all the difference in the world with the bass drums. Sealed box, stiff subs, and damping factor. You want the speaker wire as large as practical and as short as possible. For instance, 12AWG CTA-2015 wire has a linear resistance of 0.00559 ohms per meter. For simplicity, let’s use an amplifier with a DF of 1,000 at 4 ohms. This means the output impedance is 0.004 ohms. So, it’s 500 at 2 ohms. The linear resistance is ROUND TRIP. So 1M would be 1/2M long from the amp all the way to the sub, both inside and outside the box. Now, say you have 1M of 12AWG on an amplifier with an output impedance of 0.004 ohms. Add the linear resistance of the wire and now it’s 0.00959. On a 2-ohm sub, that’s now 208 (2/0.00959) You’ve effectively cut it by 60%. Now for 1M of 8AWG. Linear resistance is 0.00221. Total would be 0.00621. Damping factor is now 322. The “ideal” is around 311. The problem with going any larger than 8AWG is that it starts to create inductance and also most amplifiers and subs can’t accept anything larger than 8AWG. You could use those output adapters that reduce a larger wire into a terminal, but each interface/connection will add resistance. Remember, we’re talking thousandths of an ohm here. So, the largest practical gauge with the shortest length and the fewest possible connections will maximize the damping factor. Now, if ohave an amplifier with a low DF, this isn’t going to make any difference at all. Most Rockford Fosgate amplifiers only have a 4-ohm DF of 100, 50 at 2 ohms. Use 12AWG at that point. It doesn’t matter. If you listen to music with long drawn out bass notes, it really doesn’t matter either. This only applies to music with sharp bass and amplifiers with high Damping Factor. But for those of you like me who want those double bass kicks to sound like a jackhammer rather than a messy tone with the pulses run together, this is the way to go. You should also run your sub’s speaker wires through a small hole in the box with them attached to the sub already, install the sub in the box, and pull the wires until taught. Then install the amp as close to that as possible. Have the hole on the side of the box closest to the sub’s terminals. A connection like binding posts or a terminal block will add resistance. If you can get the run to be 1/4M long, which is about 9-27/32”, you’ll be even better. Then your total DF will be 392. So, there’s the reason for running such large speaker wire to a subwoofer.

SonicElectronix, stock more of this stuff PLEASE!

NVX XWS0820

NVX XWS0820 is exactly what I wanted. The delivery was also very fast.

By Jose arellanes on October 30, 2022 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 price on 8ga OFC speaker wire

Never been let down by NVX. Great overall value. High quality OFC copper and properly gauged

Good

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

Exactly what I needed

The speaker wire is awesome. I’ve used the nvx 12 gauge wire before but need a larger size for better current flow. This solved those issues have this wired on 2 dc audio level 3 15’s and fit like a charm. Would highly recommend it.

By daniel on June 28, 2020 Verified purchase

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

Awesome

Speaker beat harder than I thought it would! Holy Lord 2 of these and a 4000w hifonics amp sheeeeeesh

Awsome Subwoofer!

It arrived on time and was in great shape. I would recommend this product and would purchase another one.

Cvx 12s

I would recommend these to anyone who loves Kicker and this is basically a round L7 they get down hard

Very happy.

This thing sounds amazing. Installed in a Ford Flex in a !.5 cubit foot ported box paired with a Kicker CXA800.1 amp. Pretty decent lows and very crisp sounding. Been using it for a little over a year now and still sounds great

By John on January 22, 2021 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

Like all of NVX this is amazing

NVX has always been the king of making awesome products that won’t hurt the bank! This wire I would honestly say beats all the the competition and doesn’t cut corners! Thank you NVX!

By Carson on March 29, 2025 Verified purchase

Awesome 8 ga speaker wire...it's the only wire I use for subs!!

I love the quality, durability, and flexibility of this speaker wire!!

By Ryan on March 14, 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