Denovo Audio Sledge M4-18 MDF 4.0cuft Subwoofer Flat-Pack for 18" Subwoofers

I was blown away by the great packaging and simplicity of these boxes. I ordered 2 and was able to glue the first one together faster than it took to break down the cardboard and dispose of the packing materials. You do not need much skill to assemble these! It was extremely simple to put together and afterwards I feel like you could drop it off a roof and it would stay together.

Bought two of these for a pair of Dayton Ultimax 18" subwoofers. This was my first DIY audio project and it was as straight forward and easy as it gets. The CNC cut pieces fit together with near perfection and zero slop. Once the glue dried, the box was incredibly strong and very well designed. My pair of Ultimax subwoofers sound solid in these boxes with zero noticeable flex or air leakage that I can tell.

I'm now fully sold on the concept of DIY audio and am looking on building at least two more of these to add to my home theater setup.

I used this kit for my Dayton Ultimax 18. I was originally going to have a buddy of mine build my box for me, but the time this saved us BOTH was INSANE. It's foolproof, requires little to no tools (great for first time DIYer's without a ton of clamps/saw/routers, etc).

The box is about as sturdy as it gets. The Ultimax 18 in this box took all my bridged Crown XLS2000 could take and didnt move much if at all. This is due to proper bracing and panel construction resulting in little to no vibrations, ensuring all your power goes to making sound instead.

I've since gone a route that requires custom boxes, but this is my first recommendation for anyone looking to DIY a good box that doesnt have a ton of tools handy, or a budget to buy them.

(Posted from the old site)

I purchased one of these flat packs for my Dayton UM18 sub and the packaging job was the best I have seen from any on-line retailer. They used a well thought out method of strapping the panels together and an abundance of styrofoam to protect the MDF in shipment rather well... so no worries there.

The fit and finish is second to none and the precise CNC cuts make it a breeze to put together with wood glue and a handful of clamps. A close inspection of the seams after glue up indicated that it should be air tight, but I used caulk to seal the seams for peace of mind. I finished mine with Restore 4X tinted black and used a 4 Pole Neutrik connector for the speaker cable.

The finished product looks great and I'm seriously thinking about picking up a second one as the time the flat pack saves in sourcing the MDF, measuring, rechecking, cutting and cleanup is well worth the selling price. If you're on the fence, don't think twice... buy it!

(Posted from the old site)

As the reviewer above noted, skipping the steps of designing, then buying, hauling and cutting the mdf for the boxes makes the job so much easier (been there, done that). And the flat pack was precision cut, heads above what I could of done at home.

I used Titebond II glue with a bristle brush to spread, 24" wood clamps and also smaller Quick Grips clamps where needed. I do recommend using clamps to assemble these, as they will squeeze out the excess glue and make a tighter fit.

Thanks again to Erich for the great product and service. Now that I built one box, plan on doing second for a pair of Ultimax 18" subs.

(Posted from the old site)

I put together two of these bad boys for some Subs. I'm not done yet but I have managed to glue them up. They are so perfectly cut that I only needed titebond wood glue and painters tape. First I ran my fingers along the wood channels where the glue would go to make sure they are clear of any dust or packing material debris. Then i dry fitted the whole box to make sure the panels are in the right way. The top and bottom panels are not a perfect square (as its designe), so it's important to dry fit to see which way they go. Then don't over do the glue, put a bead on he bottom piece keeping about an inch from the ends. Pop in the two braces and finally the third brace to fit on top of them. Press down and you'll see some glue squeeze out. If it comes out the sides, wrote it away. It's important to wrote it away because now you will reassemble the box with the remaining pieces without glue, line up all the edges by hand and them use your painters tape to tape up all corners. What you are doing is letting the box itself BE your clamps. When dry, t she the tape off and the remaining dry pieces. Now we are going to glue all the sides on. Put glue where ever MDF will touch MDF keeping the top piece dry. Wipe away any glue that might touch it. Then put the top piece in place and use your fingers to line up all the panels, keep checking the corners and seems to get them as close to perfect as you can, then use painters tape to hold them in place. When dry, pull the tape and then inspect the inside. Squeeze glue into any seams you can see inside, its ok to use your finger to drag it up and into place. Then put the glue down for the top piece and put it back into place, it should be a tight fit. Line it up with your finger and let it dry, hold it in place with painters tape. Finally use lots of glue on the backside of the baffle and put it on top. Line it up with fingers. Put weight on it. Done.

(Posted from the old site)

The quality and ease of assembly is second to none. I used Titebond wood glue and everything worked out perfect. These boxes are highly recommended!

Erich answered my questions promptly and the packaging for shipment was superb.

Now time to save my pennies to buy another one.

(Posted from the old site)

i bought 4 of these for 18" woofers they went together great and smooth. Saved me time and was able to get to the fun stuff. They are awesome and thank erich for his work. keep it up! looking forward to other stuff.

(Posted from the old site)

What a great idea cutting these boxes with a CNC machine. I ordered 2 and they went together about 10x faster than if I cut them myself, and certainly nicer looking too. Highly recommended.

(Posted from the old site)

Ordinarily I wouldn't dream of buying a flat pack because I enjoy the woodworking aspect of building speaker boxes. Unfortunately a torn Achilles early in the year has me a little hobbled, but I still eagerly wanted to build a new HT sub. After picking up an Ultimax 18 from PE I weighed my options. The idea of all that work suddenly seemed more daunting and that it was a perfect time to try a flat pack.

I received the kit in just a couple days and it went together in another two without a hitch. As others have noted, everything came EXTREMELY well packed. The precision cuts are fantastic. I was very impressed. Kudos to Erich all around.

Anyone with limited time or mechanical means should definitely consider one of these kits. It really is a great deal when you consider the time and mess you'd otherwise have in a project like this.

Highly recommended!

(Posted on 2/4/16 from the old site)

There is a reason these have nothing but 5 star reviews, they are EASY to put together and you end up with one hell of a good value. Very tight tolerance on the cuts, the panels fit together perfectly. My OCD won't allow me to use tape, just a bunch of clamps and letting every panel fully set before removing them. Still, they went together with just a few minutes per panel whenever I had time. I managed to get a few of the sides slightly out of square during assembly but a very quick touch with a belt sander yields a box with perfect edges all around. I haven't even bothered to put the Duratex on them yet because they honestly look pretty good as is.

Finally, and most importantly, after building these I ordered a pair of volt 6's for my business and am probably going to order some volt 10's for my shop. I like these DIY kits and would recommend them to a friend.

(Posted on 12/10/15 from the old site)

I've originally ended up with this same enclosure when I ordered my 18" Dayton RSS460HO subwoofer as a kit. It's been quite some time since, when I ended up going with the dual opposed enclosure flat packs that were for sale here on DIYsoundgroup. It was my first flat pack assembly and it sure was a good learning experience.

I recently decided to re-use this enclosure, and I ended up having ordered another one that fitted the Stereo Integrity drivers. The reason being, because the JBL 2242H drivers fit the baffle cut for the SI drivers perfectly with some space to spare. I had to modify my original enclosure to make it fit.

I didn't want my original enclosure to go to waste and I wanted a second matching enclosure which made life easier. =)

(Posted on 9/4/15 from the old site)

The boxes are totally top notch. They go together very easy. Just "dry-fit" them first and make sure the to put them together in proper order. I used Titebond 3 wood glue, excellent. I also used ratchet straps and some gym weights to apply some pressure to the pieces as they dried. I only did a section at a time to ensure proper curing time of the glue. Erich, can you upload the sequence of installation panels onto your site here? I know it's on the avs forums, unfortunately, I can't find it to post a link at this time. Thanks! BTW, I have a qty. of 6 18" SI Subs in my home theater. Stop thinking about building your own and just order these! You will thank me!

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Note from Erich: The photos showing assembly order have been on the 4cuft product page. The clickable photos are under the products picture. I'm glad you liked the flat packs.

(Posted on 2/13/14 from the old site)

A fellow member from the Klipsch forum directed me here to start my first diy sub, and I'm glad he did.

Thank your sir for your fine quality product. I wasn't aware that this is only a hobby of yours, and after finding that out I was blown away. The pieces for the 4 cu ft sub are cut perfectly. I ordered the cut for the 18" Stereo Integrity drivers, and they just slide right into the cutout for them. I started off with just two boxes, however I will be ordering two more once I have a bigger room to allow such monster subs. Thanks again.!

(Posted on 2/5/14 from the old site)

These things are worth every penny. After putting together two of these and two Tempest flatpacks I'm convinced that short of owning a CNC there's no way to get the quality of fitment these things provide. Everything fits like a glove. Grab a half dozen 24"-36" bar clamps from Harbor Freight and some TightBond II and you'll have it done in a couple hours (letting things set up between steps).

(Posted on 10/6/13 from the old site)

I ordered 4 of these flat packs and it is so simple to build your own subwoofer box!!

All the panels go together easily and the sub slides right in. I like the fact that I can place the threaded binding posts wherever I want...for my situation, I have a tight fit behind my AT screen/false wall and have mounted the posts on the top of the box.

Thanks again Erich!!

(Posted on 4/10/13 from the old site)

Go to Lowes, get a big piece of MDF, screws, glue, new saw blade, filler and a lot of sand paper. Spend many hours cutting, sanding and making a big dust bowl mess out of everything.

or

Buy a couple of these flat packs and a SW of your choice. Open bottle of wine to enjoy while building. Open well packed precut pieces of MDF (very well packed), lay out pieces, glue them up, bam! your done. Make sure that you get a couple of sips of wine down before you build, because they way that these kits are designed you could finish a kit before you finish your wine.

Really good kits and an easy build with your son, spouse, daughter or significant other. CNC cutouts remove all the hollering, cussing and screaming.

(Posted on 4/4/13 from the old site)

Way too easy! Perfect fit: I did the 'just glue and masking tape (blue tape)' thing and it turned out with just a red hair to be trimmed off before painting.

(Posted on 4/1/13 from the old site)

great kit , super easy to assemble , very good quality cuts and very safe packing and low price
i had my share building boxes but if its made this easy don't even bother getting your saw out ....
an outstandingly fantastic job , thank you Erich

next i 'll be waiting for a PPSL or big TH kit

(Posted on 3/14/13 from the old site)

If you are even entertaining the thought of DIY, and do not wish to tackle the woodworking aspect of the enclosures, this IS the solution for you! All panels are packaged securely and are cut perfectly for easy, snug assembly. Choose your driver, tick the proper box on the site, grab your drivers, and GO! Thanks Erich!!!

(Posted on 3/13/13 from the old site)

I'm currently building one of these boxes with only masking tape. I don't have any clamps. It's that easy. It's design is such that it almost holds itself together. I don't know where I'd be without these flat packs. Thanks. :)

(Posted on 3/12/13 from the old site)

I bought 2 of these for the Dayton 18 HO drivers. Packaging was great and the MDF sheets are very solid. I used PL Premium adhesive with a combination of bar clamps and ratchet tie-downs for one box and Titebond II glue with bar clamps for the other; both went together fine and couldn't have been easier to assemble. Thanks!

(Posted on 3/4/13 from the old site)

I just received both of my flat packs for my drivers. A lot of time, effort, and material went into boxing up these bad boys.

I've only opened one box so far (drivers are on back-order still and not in a rush). Everything was bundled/tied/padded to keep all the pieces from flying around and getting royally beat up. We all seen the videos and know how rough some of our shipping companies can be! :)

Well worth it!

Thanks again!

(Posted on 3/3/13 from the old site)

I purchased 2 of these with cutouts for the Dayton 18in HO driver. Packages arrived very quickly after shipment and were packed extremely well. These go together just as easy as all the flat-packs from this site. Dado joints make assembly a breeze using wood glue or PL., no need to nail/screw.

Once assembled boxes are extremely solid, bracing is prefect and makes for a very ridged (and heavy) box. MDF is high quality and easy to finish. Driver cutout is perfect, Drivers fit in with no play and perfect spacing all around .

(Posted on 3/3/13 from the old site)

Absolutely gorgeous cabinets! Easy to assemble, perfectly cut, attention to detail, its all there! Worth every penny! Thank you so much!