Design Analysis Paralysis... - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 16 Old 08-31-2019, 04:08 AM - Thread Starter
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Design Analysis Paralysis...

I'm looking for a relatively uncluttered arrangement for my HT... hoping to do a couple of subs either behind the AT screen or in the ceiling (see my other thread) and am not interested in near-field subs. I like music and movies but I'm going to ask this question mostly for movie use.

If everyones room was the same and we didn't have to account for differences in size, furniture, treatments, etc... what would you all recommend as a sub cabinet design that does everything well as opposed to excelling in one area while falling short in another? Something that has both good LFE and mid-base thump.

I have room for two submaximus v3's, four devastators, etc... but just can't seem to settle on a design and was hoping that someone with experience might chime in. I've attempted to model different setups, but really don't fully understand what I'm doing...
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post #2 of 16 Old 08-31-2019, 05:56 AM
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I would say 4 B&C 21's are a good all-arounder. They have enough lows and enough mid-bass to keep most people happy.
Port it to 15-20hz and you're done!

A FP20k is a perfect fit for that application, it has all the power you'd need, and if you get the DSP version you'd even be able to set some basic XO's and EQ points via touchscreen or pc.
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post #3 of 16 Old 09-01-2019, 03:37 PM - Thread Starter
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I would say 4 B&C 21's are a good all-arounder. They have enough lows and enough mid-bass to keep most people happy.
Port it to 15-20hz and you're done!

A FP20k is a perfect fit for that application, it has all the power you'd need, and if you get the DSP version you'd even be able to set some basic XO's and EQ points via touchscreen or pc.
I have been lusting over the B&C 21's since @eng-399 built his first cabinets. It that the type of design you are recommending, or something else? I've also been reading about the FP amps, but that thread is making my head hurt with all the options of who to purchase from, so I'll be asking more questions about amps soon.
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post #4 of 16 Old 09-02-2019, 04:36 AM
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Still looking or abought?
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post #5 of 16 Old 09-02-2019, 04:51 AM - Thread Starter
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Still looking or abought?
Still looking... was just reading some of @Red Five different design threads trying to settle on something.
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post #6 of 16 Old 09-02-2019, 03:33 PM
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Still looking... was just reading some of @Red Five different design threads trying to settle on something.

If you have the space for four Devastator V1s loaded with LaVoce 214.50s I would highly suggest going that route. Reception on the Devastator has been very positive thus far. Talking to John 19Hz tunes for most folks seem to be enough extension. My sub is tuned around 18 to 19Hz and I am very pleased with the low end it delivers in room. If you want to get more extreme a couple HST18s tuned below 15Hz and some clone amp power paired with two Devastators would give you the best of both worlds. They are on sale at the moment.

Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #7 of 16 Old 09-02-2019, 03:57 PM - Thread Starter
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Originally Posted by Red Five View Post
If you have the space for four Devastator V1s loaded with LaVoce 214.50s I would highly suggest going that route. Reception on the Devastator has been very positive thus far. Talking to John 19Hz tunes for most folks seem to be enough extension. My sub is tuned around 18 to 19Hz and I am very pleased with the low end it delivers in room. If you want to get more extreme a couple HST18s tuned below 15Hz and some clone amp power paired with two Devastators would give you the best of both worlds. They are on sale at the moment.
I like the way you think! So what type of design are you suggesting for the HST's? I guess what I'm asking is what type of cabinet would I use to get the 15Hz tune?
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post #8 of 16 Old 09-02-2019, 04:10 PM
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I think you would blow air velocity out of the water on the double helmholtz resonator Low bass module with the HST. It is designed around using a UM18, which hits 28mm at 1200 watts roughly
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Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #9 of 16 Old 09-02-2019, 04:12 PM
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I have a sim on a quarter wave + helmholtz design that has better excursion control than this one, but it is tuned higher around 15.5Hz. This one is tuned at 13Hz. The QW with the higher tune his 125 db with the UM in the 20Hz range and with 1500 watts of power. An HST version would get out of control lol.

Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #10 of 16 Old 09-03-2019, 07:44 AM - Thread Starter
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I have a couple of questions, but I'll start with this one;
The HST18 is $580 ea, and the UM18 is $570 for two... is the HST that much better than the UM?
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post #11 of 16 Old 09-03-2019, 08:14 AM
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I would say build two of the Devastators. If you have so much mid bass it is hard to breath, maybe adding some more low end is right, but if you feel like you need more of that mid bass and are happy with the low end, just add two more Devastators.

Stormbreaker | Wisconsin Home Theater Meet Thread | The Devastator Index
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Epson 5010e | 120" DIY AT Screen
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post #12 of 16 Old 09-04-2019, 04:52 AM - Thread Starter
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Here is question #2 ;
The pic below is a 'top-down' view of the screen area of the theater... ceiling height is at 9.5 ft. I'm not able to 'flip' the room and put the screen on the opposite wall which is flat for several reasons, so I'm forced to put my subs in the weird 9' x 3' notch area. How bad is the sub positioning I've drawn going to be on overall sound? Do I need to consider other types of cabinets for that space?
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post #13 of 16 Old 09-04-2019, 03:03 PM
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Do I need to consider other types of cabinets for that space?
If that notch is behind the screen and will not be used for anything else OMHO sealed would be the only thing I would consider. 243cuft sealed enclosure with 20 -21” subs would make this entire forum take notice. Only problem would be powering them. I would suggest making “rows of 4” and throw them in as you can afford or what your electric company will allow you to use. Someone should model that.....
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post #14 of 16 Old 09-05-2019, 03:30 AM - Thread Starter
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If that notch is behind the screen and will not be used for anything else OMHO sealed would be the only thing I would consider. 243cuft sealed enclosure with 20 -21” subs would make this entire forum take notice. Only problem would be powering them. I would suggest making “rows of 4” and throw them in as you can afford or what your electric company will allow you to use. Someone should model that.....
Once again, I like the way you think! I have this image in my head of the AT screen looking like a child blowing up their first balloon... expands, contracts, expands....
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post #15 of 16 Old 09-05-2019, 04:07 AM - Thread Starter
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I've been thinking about this, and taking inspiration from others threads. I don't see a reason to limit myself to one cabinet design. So, I'm thinking about a Submaximus v3 in the center of the notch using something with a healthy motor like a UM18 or HST18. Then flanking that with a pair of Devastators running LaVoce 214.50's. This would give me LFE from the SMv3 as well as mid-bass (spelled correctly) impact from the Devastators's. I see a possible issue with driving an odd number of subs, but correct choice of amps should take care of that... or... I could just add another SMv3

Any thoughts?
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post #16 of 16 Old 09-05-2019, 08:43 AM
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Originally Posted by mumbles60 View Post
I've been thinking about this, and taking inspiration from others threads. I don't see a reason to limit myself to one cabinet design. So, I'm thinking about a Submaximus v3 in the center of the notch using something with a healthy motor like a UM18 or HST18. Then flanking that with a pair of Devastators running LaVoce 214.50's. This would give me LFE from the SMv3 as well as mid-bass (spelled correctly) impact from the Devastators's. I see a possible issue with driving an odd number of subs, but correct choice of amps should take care of that... or... I could just add another SMv3

Any thoughts?
Sounds like a solid plan!! Time to press "Place Order" and then get loads of plywood for the Submax!
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