Sledge M6-21 6.0cuft Subwoofer Flat-Pack for 21" Subwoofers

Purchasing Notice:  These are heavy flat packs that get shipped in two boxes.  Many people asked for no roundovers on the front panel so they could veneer the cabinets easier.  This first run of 100 cabinets doesn't have a roundover on the front.  If by some chance you really need a roundover, please contact me and I'll see if I can get that done for you.  

The Sledge M6-21 is a 6.0 cubic foot sealed subwoofer flat pack with full depth bracing every 7 inches.  The cabinet is made from premium 3/4" MDF which is much nicer than the MDF sold in home improvement stores. It's a heavier weight product that cuts very clean, making it ideal for speaker and subwoofer cabinets. The well thought out interlocking bracing system allows you to assemble the entire cabinet quickly and easily using wood glue with no need for screws or nails.  If you prefer to also use brad nails or screws, we've included marks on one side of each panel so you know exactly where to install the nail.  If you don't want to use nails, the panels can be flipped around so that the markings are on the inside of the cabinet and not seen.  This gives you multiple options for assembly to make things much easier than other flat packs.

Most 21” sub drivers will fit in this cabinet including the 21" Eminence and 21" Lavoce subwoofers.  Terminals, binding posts, and/or speaker spikes can be shipped for free if you order them at the same time you order this flat pack.

Product Highlights:

• 6.0 cubic feet net internal volume
• 1.5" thick front panel
• Well thought out full depth braces designed for extra cabinet strength
• Made from premium highly refined MDF that meets all Carb 2 requirements
• CNC cut for incredible accuracy
• Rabbet joints and dado grooves help align panels for easy assembly
• Can be used as a downfiring subwoofer by installing legs on the front panel

Note from Denovo Audio: We promise you ‘No Fluff’. When building any subwoofer cabinet it’s important to know what you’re getting, so we’re upfront about everything. We clearly state the net volume on all of our cabinets so you can make a more informed decision. 'NET' is the true internal cabinet volume after subtracting off bracing and ports. Don’t be fooled by other company sales tactics or over exaggerated claims.

Every flat pack is precisely cut using a $400k industrial CNC router so panels fit together perfectly in rabbet joints and dado grooves. There's no sloppy assembly with our cabinets. In fact, cuts are so precise that some people have assembled them using nothing but strong masking tape to hold the panels together while the glue dries. Denovo Audio flat packs are incredibly popular because of their accurate cuts, thoughtful designs, and premium grade wood.

Price Break Down:

Cost: $

Paypal Fee: $

Total Cost: $

Picked up in person:  Please contact me.

Pricing for 10 or more cabinets: Please contact me. 

Recommended Tools:

• Clamps that open as big as the longest side of the flat pack.
• A mallet (or a small piece of wood and hammer) to lightly tap pieces into place if needed.
• Quality wood glue like Titebond. Some people use PL adhesive.
• Sandpaper or sanding block for smaller cabinets, but a power sander speeds things up a lot.
• Some prefer to use brad nailers for quick assembly, but clamps are just fine with no need for nails or screws.

Assembly Notes:

This is an easy cabinet to assemble and can be done a few different ways.  Believe it or not the panels go together so good that some people have assembled these just using masking tape to hold the pieces together.  That's actually what they do in cabinet shops.  My directions make assembly sound a bit harder than it actually is, but once you have the panels laid out, you'll see how easy it can be done.  My directions assume you're using a wood glue like TiteBond, Elmers wood glue, or something similar. 

Assembly Tip: When clamping, you don't need to put lots of pressure on the panels, just enough to keep them from sliding around.  Too much clamping pressure just squeezes all your glue out which isn't really a good thing.

Assembly Tip: Dry fit panels as you go and mark where you need to put glue so that glue is used anywhere two pieces of wood touch.  Take your time.

Assembly Tip: Rabbet joints are purposely cut about 1/64" bigger to allow for user error, slight shifting, excess wood glue, etc. while gluing them up.

Assembly Tip: Sit the bottom panel up on something to keep it a few inches off your work bench.  This allows the head of your clamps to fit under the panel so you can clamp the other pieces to it much easier. 

I prefer to glue the port pieces together in first. Then bracing.  Photos coming.  

Last piece is the outer baffle.  Just put a bead of glue around the edges, then around the woofer cutout, then just drizzle it around the rest of the areas.  Lay the baffle on.  It will slide around a little bit, but don't worry.  Lightly tighten your clamps down while working your way around the box shifting the baffle into position.  If you have a small clamp, you can use it inside the woofer cutout to clamp the inner baffle to the outer baffle.  

More Tips:

• Dry fit all pieces together first so you can see how the cabinet is suppose to assemble.
• Don't rush your build. Glue one or two panels at a time to make assembly accurate and easier.
• Use a quality wood glue and put a bead of it anywhere two panels touch.
• Clamp each panel for at least 30 minutes, then move to the next step. (depends on adhesive used)
• Don't over-clamp your panels.  Tighten your clamps enough to hold the panel in place.
• If you're going to add any filler to the seams, sand the edges down flush before adding filler.
• Predrill your woofer screw holes with a 7/64" or 1/8" drill bit.
• Protect your woofer when installing screws. You don't want the screw driver to slip and puncture the woofer!