I haven't had a chance to ask about it, but JTR announced a bit back they are coming out with the Growler Duo.
From what I can tell from the website, its an active twin driver horn loaded subwoofer with two modes: "LOW" mode is +/-3db from 20-180hz, "NORMAL" mode is +/-3db from 37-180hz. Low mode is 122db at 20hz.
Here is the best link I could find:
http://jtrspeakers.websitetoolbox.com/post?id=4608644
I'm sure pictures will be out soon.
$2800 is expensive, but considering it has a built in 4,000 watt amp with DSP.... by the time you buy a nice pro-amp and a processor.... it starts to sound like more of a value.
Anyways, whatcha think!?