Owen's Dual UXL-18 Sealed Build - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 43 Old 02-23-17, 10:41 AM Thread Starter
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Owen's Dual UXL-18 Sealed Build

I've been really looking forward to the subwoofer part of our eventual basement build, and I finally have made progress on that front.

I knew for a long time that I wanted to try a sealed approach this time, having had 2 different ported subs before (and currently). I thought I'd go for a pair of big ones, and when the opportunity came up last year I jumped on a group buy for a pair of Mach 5 / IST UXL-18s. These things are hand built in Canada by @mrogowski , and are extremely capable drivers. 34mm xmax, 1,200w power handling, 65lbs of woofage, and I now have a pair of them. Just for reference, on pure displacement capability, I think a single one is capable of about 2.7 times what my Tempest can move.

I fiddled around a lot with enclosure sizes, WinISD graphs, and checking other peoples builds, and I settled on exterior dimensions of 20(w) x 20(d) x 22(h) for an effective net internal volume of about 3.3 cubic feet which should be very reasonable for this driver. I'll be using a MiniDSP on the pair in the final setup, likely working in a Linkwitz Transform to bring up the bottom end. Power will be from an iNuke 6000 (non-DSP), one sub per channel. Below is an approximate comparison of my existing SDX-10, Tempest, plain sealed UXL, and the same UXL with an LT applied.
Attached Thumbnails
Owen's Dual UXL-18 Sealed Build-winisd-compare.jpg  


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post #2 of 43 Old 02-23-17, 10:43 AM Thread Starter
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Re: Owen's Dual UXL-18 Sealed Build

After a lot of calculation, speculation, and general sitting around doing not much, I've finally made some progress with real tangible results.

My drivers came in (boy, are they heavy!) and arrived in good condition. My junior inspector seemed excited to get them... but it turned out he just wanted to play with the packing material. They sat around in their packing for quite a while, because I didn't have an amp for them, MDF for them, or time to actually DO anything with them. Eventually I picked up an iNuke 6000 (non-DSP), and hauled out the MDF sheets I had buried in the garage, and got to work.

Where to start? First impressions I suppose. Until now I have owned an original 15" Tempest (which was a monster, especially to me, back in 2006 or so). These things are straight up beasts in comparison. The carbon fiber cones and caps are beautiful, and the big fat surround is impressive, to say the least. The magnets are huge, and did I mention they're HEAVY? I know there are bigger drivers out there now, but these are still right up there. Build quality seems very good, and I found no issues with a visual inspection on arrival. Mark does great work, and I am very excited to have 2 of his exceptional drivers in my theatre.

I will be using Speakon connectors, so to get any kind of a signal to the subs, I had to put together the enclosure connection terminals. A little bit of soldering, and some quick and dirty heat shrink, and they were ready. My senior inspector enquired about modifying some settings before going off to bed, and had his request denied. Lol. When I did have the opportunity to set up a quick test with the iNuke, everything worked the first time out, which is always nice. In free air, sitting on the floor, with limited power after the kids were in bed, my wife could still hear "Bass I Love You" from upstairs. I had a bit of hum at higher gain, but I'm not worried about that for now since the setup for the theatre will be completely different.
Attached Thumbnails
Owen's Dual UXL-18 Sealed Build-uxl-18-001.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-002.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-003.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-004.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-005.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-006.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-007.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-008.jpg  


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post #3 of 43 Old 02-23-17, 10:44 AM Thread Starter
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Re: Owen's Dual UXL-18 Sealed Build

Now that I knew I had working subs and amp, it was time to start the hard part and do some work. That didn't happen for another month or so until I had a morning off work with the kids at daycare. A week or so prior, I pulled out the MDF sheets I had and did a quick thickness test, and a rough cut with the circular saw to make the rest of the cuts more manageable on the table saw. Conditions hadn't improved much by the time I got to the rest of the cutting. I had less snow, but a lot of fog and periodic misty periods. I rigged up a little support system for the first cut on the larger panels, and got to making dust.

Setting up the saw and running all the same length cuts one after another makes things SO much easier. Then even if I make a mistake, at least I'm consistent and things will match up. By the end of the morning I had 2 nice piles of panels ready to go. I decided to make the inner baffle out of 3/4" plywood, to give the T-nuts something a little tougher to bite into with this heavy driver. The final subs should be about 20 x 22, which seems tiny when I look at them now, but I have no doubts they'll get the job done.
Attached Thumbnails
Owen's Dual UXL-18 Sealed Build-uxl-18-009.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-010.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-0011.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-0012.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-0013.jpg  

Owen's Dual UXL-18 Sealed Build-uxl-18-0014.jpg  


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post #4 of 43 Old 02-23-17, 12:12 PM
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Re: Owen's Dual UXL-18 Sealed Build



The driver is bigger than your helper!

Excellent build thread.

-Jim

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post #5 of 43 Old 02-23-17, 02:10 PM
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Re: Owen's Dual UXL-18 Sealed Build

Coming along nicely! Looks like you could use an outflow table. You have some nice tools. It would make life a lot easier. Looking forward to the build!
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post #6 of 43 Old 02-23-17, 07:02 PM
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Re: Owen's Dual UXL-18 Sealed Build

Quote:
Owen Bartley wrote: View Post
The final subs should be about 20 x 22, which seems tiny when I look at them now, but I have no doubts they'll get the job done.
That is very small for that size sub woofer!..Is that the recommended size cabinet?

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post #7 of 43 Old 02-23-17, 07:25 PM
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Re: Owen's Dual UXL-18 Sealed Build

Wowzers that's going to be one monster sub setup! Looks great


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post #8 of 43 Old 02-24-17, 09:33 AM Thread Starter
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Re: Owen's Dual UXL-18 Sealed Build

Quote:
theJman wrote: View Post
The driver is bigger than your helper!

Excellent build thread.
Quote:
Tonto wrote: View Post
Coming along nicely! Looks like you could use an outflow table. You have some nice tools. It would make life a lot easier. Looking forward to the build!
Quote:
fusseli wrote: View Post
Wowzers that's going to be one monster sub setup! Looks great
Thanks everyone! I'm REALLY looking forward to getting these up and running.

Quote:
Prof. wrote: View Post
That is very small for that size sub woofer!..Is that the recommended size cabinet?
It's on the small side, but this driver does well in small sealed enclosures. 3.5 - 4 cubes is great, but in all my sims it was barely noticeable to go down to 3.3, and that fit the size I was hoping for. They'll be tucked behind a screen wall eventually, so I wanted to keep the depth under 2', with enough wiggle room to move them around. Also, the smaller airspace will give me a bit more protection from accidental overexcursion.

Oh, and yeah Tonto, I really could use a nice outfeed table setup. This was the best I could cobble together on short notice, but it actually worked really well. There are so many tools and accessories that I would LIKE to have, but I just can't justify for practical reasons. My tools aren't super fancy or anything, but they do the job.

That table saw was rescued from the dump by my dad and rehabilitated for me. I like the old SOLID saws vs the newer contractor ones, because having a big rigid surface is a big help sometimes. He put it on wheels for me, and I built my garage bench with a little parking spot for it underneath, so I can still fit the car in when it's put away. A table saw was one tool I wasn't willing to go without, even with my limited space.

- OJ -

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Last edited by Owen Bartley; 02-24-17 at 09:41 AM.
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post #9 of 43 Old 02-24-17, 12:01 PM
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Re: Owen's Dual UXL-18 Sealed Build

Quote:
Owen Bartley wrote: View Post
It's on the small side, but this driver does well in small sealed enclosures. 3.5 - 4 cubes is great, but in all my sims it was barely noticeable to go down to 3.3, and that fit the size I was hoping for.
If you added 2 pounds of stuffing you could make up the space, so perhaps that's something to consider.

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post #10 of 43 Old 02-24-17, 12:17 PM Thread Starter
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Re: Owen's Dual UXL-18 Sealed Build

Quote:
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If you added 2 pounds of stuffing you could make up the space, so perhaps that's something to consider.
Thanks Jman, I'm definitely planning to stuff with cheap Walmart pillows to get a little more virtual space back.

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