Posting this here and in JTR thread:
I currently have four JTR Cap 1400's in our theater area on hardwood over cement slab floor. It's open on two sides to a 39 ft x 49 ft open space that's approx 10,000 cu ft in volume. I also have an unfinished Danley DTS-10 that I built before buying the four Captivators.
Room gain is normally 12dB/octave starting at the frequency where the longest room dimension is 1/2 wavelength. A wavelength in feet is the speed of sound (1130 feet per second) divided by frequency. Therefore, I don't expect to get any appreciable room gain until approx. 11.53 Hz (49 ft x 2 = 98 Ft, 1130/98 = 11.53 Hz.)
I am looking at options to increase extreme ULF below the 17 Hz roll off on the Captivators and beginning of room gain at approx. 11 Hz:
Option # 1 - Crowson Tactile Transducers
($2,499 Level 3 motion system)
I will probably end up adding tactile transducers no mater which option I choose because of the inherent limitations in a room this size on a concrete slab floor However while transducers alone might give the "appearance" of extreme ULF through tactile response, it will not give the sound pressure that I was hoping for without the augmentation of true spend pressure ULF under 17 Hz.
Option # 2 - Two more Quad JTR Captivator 1400's
($4,599 teak finish)
Get two more Captivators in addition to the four I already have. I'd stack two at the front between the FR/FWR and F/FWL speakers and keep two at the rear behind the sofa. Cap's do have some response below 17 Hz and with enough of them in the room, maybe I can get the sub 17 Hz response up to reference levels.
- Danley DTS-10
($1,000 teak veneer finish)
Finish the DTS-10 and try to integrate it with the four Caps. My wife wouldn't let it into the living room until I veneered it it in teak to match our other furniture, so in the garage it sits. the DTS-10 would need to be veneered at a cost of about $400 for 2 sheets of premium qtr teak and $600-$800 for labor and finishing. I already have a QSC 4050HD amplifier to drive it. The plan would be to put it in the front right corner where we were going to build a media cabinet to hold BluRays and LP's. This could be problematic with phasing issues between the tapped horn and multiple ported subs.
Option # 3 - Deep Sea Sound Mariana 24 SR Sofa Table
($3,999 teak finish)
The Deep Sea 24" can be built as a sofa table in teak and would have the highest WAF (plus having the main LP aprox. 12" in front of a 24" woofer would allow for sone serious near feels tactile response). It would get placed directly behind the sofa underneath the rear center channel.
Option # 4 - Dual UXL-18 Sofa Table Sub
($990 drivers + $1,100 custom cabinet in teak finish)
The sofa table with dual UXL-18's might offer the same textile response as the Mariana 24" at a reduced cost (I'd have my cabinet maker build it to get the same furniture grade finish). It would get placed directly behind the sofa underneath the rear center channel. I'd use the QSC 4050HD amp I was planning on using for the DTS-10 or have to buy another amp if I did both options.
Option # 5 - Dual Reaction Audio Gamma 21's
($3,599 black + $600 custom teak cabinet). I would have to make a teak cabinet open at the front and back to enclose the dual Gama 21's. It would get placed directly behind the sofa underneath the rear center channel. Recent problems on the RE thread here at AVS give me some pause at this option.
Option # 6 - JTR S2
($3,399 teak finish). This would most closely match the "voicing" of the other JTR products in my system, plus JTR could make it in the exact Teak finish they used on my other subs. It would get placed directly behind the sofa underneath the rear center channel.