1 SI HST18mk2 or 2 Dayton Ultimax18 or other? - diyAudio
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Old 3rd May 2017, 04:34 AM   #1
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Default 1 SI HST18mk2 or 2 Dayton Ultimax18 or other?

Looking to do my first subwoofer build and hoping for some input. I'd like flat output to 20 or lower. Sound quality is first priority. This will be used in a 75% music, 25% ht setup. Supporting a pair of Zaph Audio ZRT 2.5 sealed mains. Plan to use miniDSP. Source will be OPPO 105D. Most likely looking at a sealed enclosure no more than 5 cubic ft. Would like to keep cost of sub(s), enclosure and parts, and sub amp(s) under $1200. Like the look of the Stereo Integrity HST18mk2 in a 4.2 ft3 enclosure but the Dayton Ultimax18s are much cheaper and seem to be pretty popular. I am new to this and open to thoughts and/or suggestions. Thanks.
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Old 4th May 2017, 12:22 AM   #2
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I"m no expert on subs, but I think you're headed in the right direction - many people like sealed subs with music. I don't think you'd ever be dissatisfied with the UM18.

you can get the free Winisd program and model the sub yourself.
https://www.facebook.com/WinISD/

You will also get a lot of boundary gain at low frequencies, so you might find that you don't need "flat to 20Hz" to be happy with the bass production.
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Old 4th May 2017, 01:34 AM   #3
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Thanks. Also curious as to what I should use to power it/them. See a lot of people using the iNukes but if I'm using the miniDSP, it seems like a waste and that I would rather my money for the amp be going toward clean power and not DSP stuff that I already have covered.
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Old 4th May 2017, 02:06 AM   #4
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You can get inuke without DSP its cheaper too
Mark
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Old 4th May 2017, 11:01 AM   #5
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I modeled the UM-18 in a sealed 4 cubic foot sealed box. It looks pretty awesome with 500 watts. If you use a HP filter at 15 Hz and a bit of parametric boost you can get a bit more out of it, but I don't think you will miss that last little bit if you don't have it.
the UM-18 with 500W models at 112 dB without exceeding excursion.
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Old 4th May 2017, 09:50 PM   #6
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The HST-18s appear to be intended to offer an option for those who want a lot of output in a small enclosure and can bring power to bear. Not everyone has room for multiple boxes or big boxes, but even the most powerful amps don't take up much more space than low power amps (outside of the breaker box). If you have the room, the two probably draw closer with the HST-18 probably pulling ahead just a bit in terms of maximum output and reduced distortion at higher levels over the longer term. The advantage to running two UM22s, though, would be to address room issues, which could mean more than absolute distortion levels at higher dBs. DSP does a lot, but room modes are best treated with multiple subs as has been known for decades.

I should mention that there is a third option that's just come about: popular demand has brought back the Stereo Integrity HT-18 as a MkII variant. I've not had a chance to model things up yet, but just looking at the specs that looks to have the potential to be a good competitor to the UM22. The inductance is up there, so it would be better to not to run it with too high a crossover and it doesn't have the useless carbon fiber bling if you're one to listen with your eyes, but you could get four of them for a little more than two UM22s. All three models have been proven to be good to great drivers, so it comes down to how much space you're willing to part with to make way for subs. Just note that good drivers loafing can give you cleaner sound than great drivers going flat out.
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Old 5th May 2017, 08:38 AM   #7
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The um18 dayton looks nice, ideal sealed has f3 of 26hz in 9.6ft3

But qtc .9 makes for 4ft3 with f3 of 27.5hz, pretty sweet for the small sealed sub with no eq.
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Old 7th May 2017, 03:08 PM   #8
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Default SI HT 18D2 model

Pauly -
I modeled the SI HT 18 in a sealed 4 ft^3 box with 500 watts. Pretty awesome. 116 dB maximum with 500 watts.

You can run it without parametric boost filter, or use up to 5dB boost at 25 Hz for a more flat response without exceeding xmax. Rename the attached file from .ZIP to .wpr and load it into Winisd if you'd like.
Attached Files
File Type: zip SI HT18D2 closed.zip (1.8 KB, 3 views)
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Old 7th May 2017, 03:42 PM   #9
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I'd go with the 2- um18's, almost always better to have multiple subs.
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Old 9th May 2017, 03:40 AM   #10
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true, I'm a push pull fan, and a pair of 18's can be a heavy mdf box !!!!!!!!!!!!!!!!

I've always been curious on trying a deep sealed sub.
I have my eyes on a pair of rs390hz for 11ft3 push pull sealed F3 around 30hz, and drivers come in a bit more than $345 total.

Ported F3 (and tuning) of 27hz works just fine for me, ported tuned F9 of 27hz is a little lean for me.

Last edited by norman bates; 9th May 2017 at 03:43 AM.
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