[elawton]

Willy-be, sorry I don't know what Qtc is or "critically damped alignment" is. Over my head. Care to explain?

You mentioned "rise time". I can think of a couple of things that might apply to...guessing in this context you mean the responsiveness of the sub driver to a signal compared to the responsiveness of the planar speakers? The reviews of the Infinity Kappa Perfect drivers indicate they are "fast".

So, are you saying the enclosure (slotted vs. ported vs. sealed vs. IB vs. LLT) can make that much of a difference with exactly the same driver? This is probably a sacrilegious remark here. I'm not discounting what you are saying, it's just that I don't understand why a sealed enclosure is preferred to the slotted/ported.

I still could do an IB design as stated earlier in this thread by opening a hole into the space below the stairs adjacent to my HT room. Would you recommend the vertical array with 2-4 of these Infinity drivers and simply cutting a large hole in the wall in the adjoining wall to add that volume? The hole will be invisible.