Tweakophyte, I had quad TV-12 Ultras -- but I'd much rather have 2 PB13 Ultras. 
FWIW I am not reporting or judging on SPL capabilities; IIRC Tom said dual PB13's will do around 120dB at 2m outside on the ground, and when Illka finally gets one and does a complete test we can discuss output capabilities in great detail. With maybe a couple exceptions I have no plans to discuss comparative performance either, Craig has that well under control.
Aetherhole, I'm talking about attack/decay characteristics -- impulse response. How 'sharp' is the leading edge of a transient? Please examine Illkas data and discuss this with folks more expert than I, but there does seem to be correlation between decay time (how fast the woofer/enclosure system stops) and perceived sound quality. To my ears, in the 15 Hz tune which is all I've tried so far, Tom has found a sweet spot between rise time and decay time for this system.
To me, subjectively more articulate that the TV-12, may help put this discussion in perspective

FWIW I am not reporting or judging on SPL capabilities; IIRC Tom said dual PB13's will do around 120dB at 2m outside on the ground, and when Illka finally gets one and does a complete test we can discuss output capabilities in great detail. With maybe a couple exceptions I have no plans to discuss comparative performance either, Craig has that well under control.
Aetherhole, I'm talking about attack/decay characteristics -- impulse response. How 'sharp' is the leading edge of a transient? Please examine Illkas data and discuss this with folks more expert than I, but there does seem to be correlation between decay time (how fast the woofer/enclosure system stops) and perceived sound quality. To my ears, in the 15 Hz tune which is all I've tried so far, Tom has found a sweet spot between rise time and decay time for this system.
To me, subjectively more articulate that the TV-12, may help put this discussion in perspective






















...a single PB13Ultra (around $1,300 each) will match or exceed its output capabilities. Both will have exceptional *SQ*. The advantage for the JL is its smaller size and auto-EQ. The SVS is less than half the price and has some cool features of its own(PEQ, Room comp,ect).



