Shallow DIY 18” Sub - Anyone done it? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 01-09-2020, 05:17 AM - Thread Starter
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Shallow DIY 18” Sub - Anyone done it?

I’m looking to build two DIY sealed subs, probably using UM18-22, but open to other drivers. Not very price sensitive. I’d like these subs to handle all frequencies up to 105 hz.

They will be going behind my AT screen wall. My Left and Right are 16” deep, but will be firing on axis, so figure 18-20” max depth. I imagine I’ll want these at least 4” away from the screen material (my screen goes down to 12” off the floor).

Anyone done a similar build? Any drivers I should consider other than UM18-22?

Thanks.
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post #2 of 9 Old 01-09-2020, 11:12 AM
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https://www.avsforum.com/forum/155-d...n214-50-a.html


Not an 18, but pretty epic. FYI, the search engine is very useful for these types of questions...
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post #3 of 9 Old 01-09-2020, 11:45 AM
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I've done it with my FTW21s. Rebuilding them soon into similarly dimensioned but prettier boxes. 36cm deep external from memory.

“You are not special. You are not a beautiful and unique snowflake.” Chuck Palahniuk
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post #4 of 9 Old 01-09-2020, 12:56 PM
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About 20" deep, LaVoce SAF184.03. They are awesome. The TV and media stand and Overnight Sensations are temporary as the plan will be 125" AT screen eventually. Saving for the JVC RS1000 and will do a 10" two way with compression driver, similar to an HT-10.

Box is 24W X 20D X 60H tuned to around 17 hz.

Powered by NX6000D. Definitely happy with these.
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post #5 of 9 Old 01-09-2020, 03:43 PM
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The cyclops thread has a few thin 18 builds.
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post #6 of 9 Old 01-09-2020, 03:57 PM
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If you want decent output I’d go with some B&Cs or LaVoce 18’s or 21’s, they give the same output down low as the UM18s but more midbass!


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post #7 of 9 Old 01-09-2020, 05:06 PM
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DIYSoundGroup Stonehenge enclosure is only 16" deep. I have a SI HT18 in one and love it. It's tuned to 17 Hz, I believe.

https://www.diysoundgroup.com/stoneh...8-cabinet.html
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post #8 of 9 Old 01-09-2020, 06:24 PM
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I second the DIYSG Stonehenge enclosure. Built like a tank. I've got UXL-18's in my pair. 16" deep is perfect for behind the AT screen.
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post #9 of 9 Old 01-10-2020, 04:47 AM - Thread Starter
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Thanks for the responses. A lot to think about. The Stonehenge looks great. With wanting it to perform well up to 100-105hz, what drivers should I consider other than the UM18-22. I’d like to keep each driver a 4 ohm load so I can bridge my existing Ashly FTX-2001 to them and get > 1350 watts RMS. I also want to be able to DSP each sub individually, so wiring 8 ohm drivers in parallel won’t work for me.

I’m also liking the idea of 21”, especially the B&C 21ds115-4. The La Voce don’t come in a 4 ohm version anymore. If I went 21” I’d lean toward a sealed enclosure, that’s 16-18” deep. Any designs out there for it? What about 21” flat packs?

Where can I find response curves or BL curves for the above?

Thanks for the help.
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