"Stewart Pinkerton" wrote in message
...
OTOH, your ceiling will rattle like crazy..........

If you use a manifold with opposing drivers it won't be any worse
than a box sub at the same SPL. Rattling, shaking, etc will be
solely from acoustic coupling.

BTW, if using an open baffle, watch out that you don't rip the
suspension loose at low frequencies, when you can easily drive
*way*
beyond Xmax! Note that most of the ultra-long throw drivers are

Sure but that's the beauty of an IB. Driving to Xmax yields the
maximum output regardless of alignment. For an IB you don't need
a monster amp to get to Xmax. Four AV15's will get you nearly
100dB at 5Hz within Xmax and around 120dB by 15Hz or so.

Ultra-long throw 15" drivers such as the Stryke AV15 handle
overdrive quite well. Xmax is 23mm but Xsus is over 30mm. The
suspension is designed to handle overdrive without damage up to
the power rating of the coil. That said, once you hit Xsus
you'll never want to do it again...the aluminum voice coil former
hitting the backplate sounds like a shotgun blast. With four
drivers we're talking over 20 liters of displacement at Xsus.
For another $700 you can make it 40 liters. An amp with an 8 Hz
double integrated 3rd-order Butterworth high-pass filter will
essentially eliminate hitting Xsus.

above my listening room, but I'm going with a pair of Tempests
in a
200 litre sealed box, driven by a 500 watt amp. This works
pretty

Four AV15's in an IB will give you 3x the output capability at
Xmax (15 liters vs 3 liters).