Depends on the alignment too, there's many quasi IBs around. In addition to normal subs in my room, I've got a quad set of these in full IB with an attic backspace ... and they don't need much power (that's the beauty and inherent superiority).
I've powered these so many different ways experimenting, currently I'm config'd at 225w per driver with good results. I want bullet-proof no high-pass operation though.
They're rated at
[email protected], but I've found 500w apiece is too much with HT material (full bandwidth LFE)
I'd suggest anywhere around 300w-400w for no worry operation, 400w-500w being careful.
Maybe explore an INuke with prudent setting of the limiter. I always thought a pair of EP2000s and four channels of 4ohm power would be nice too.
I've got 4-15"s in addition to the quad 18 IB, so operation on the ragged edge is no longer a concern.
The version I own is pre-redesign, the newest have a back-plate that's bumped a bit more than mine.
