DIY Dayton Audio 18" Ultimax Sub Kit (UM18-22 and Denovo Flatpack)

Picked me up a pair of these bundles today... Dayton Audio Ultimax 18" UM18-22 Bundle with Cabinet

Should be here on Monday along with some Duratex, stuffing, terminals, glue, etc.

Gonna put together a couple of sealed 18's and run them using my spare Behringer amps.

Nothing fancy... a fairly simple build with the pre-cut flatpack.

They have arrived...

Got one box done late this afternoon in about an hour...

The kit cost $400 direct from PE... or $800 for the pair. Then there is the polyfil (about $22 at Walmart for 10lbs)... glue, terminals, gasket and Duratex finish... figure on another 50-60 bucks.

I used glue with clamps until I was able to staple it. I used the 1/4" crown x 1-1/2" staples in my air stapler. I will sand and fill the staple holes then finish it.

Ehhh... not much talent to just gluing the pieces together and maybe a few staples.

Using Duratex from Parts Express. I believe it's supposed to be a satin textured finish... very durable... for speaker cabinets.

Thanks Peter. Yeah... I was impressed with the flatpack and the driver as well... very robust looking to be so inexpensive.

I have a couple of the Behringer EP2500's that I've had for years. Not sure if I will use just one or two yet. I will likely use both so that I can set the amp on top of or next to each sub.

Both boxes are together and sanded.

Thanks! Yeah... really easy to put together. It would have taken me quite some time to cut these out like he did... definitely need a DNC machine for this type of cutting.

My thoughts exactly... of course I've seen guys carve up blocks of ice to precise replications of various things with a chainsaw... so I suppose anything is possible.

Todd Anderson said:

Looking great, Sonnie!

Have you ever built anything like this before?

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Thanks... and Oh yeah... this is super simple compared to the previous builds I have done. The first one was the Behemoth that Rodny helped me with... in my first theater room:

Dual SoundSplinter RL-p15 D2 LLT Sub Project... (the Behemoth - Revival of old build thread)

Then there was the AudioPulse sub that started out as one unit in my great room after I tore out my old theater room... then end up with a pair of them in my new theater room:

Building the Pulse (Revival of old build thread)

And my last build was the dual Stereo Integrity 18's that Joe Alexander eventually purchased from me:

SI 2+2 HT18 D4 Sealed Build (Revival of old build thread)

The AudioPulse sub builds was by far the most challenging because I had to cutout and route out all those braces... and perfectly fit the port tube in the center. Those took a super long time to build and finish.

tesseract said:

Which room do I get to hear these bad boys in? Theater or Sun/Grace-room?

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They will be in the theater room

I got one coat of the DuraTex on them tonight. I think that finish is going to work out really nice... the textured look is just right.

Getting closer to having some subwoofin' in my room again...

Thanks... been working hard at learning this stuff you know.