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Romy, I realize that you have a good deal more acoustic drive available than I do, but here is my experience, FWIW:  I lived in a larger version of a very similar configuration for 13 years.  My listening room was in "the same" spot as you picture, with a 20' high 1/2 vaulted ceiling.   I could not really load it with 100 wpc (RM9) driving 92 dB 5-way speakers (Fulton modulars), despite a solid slab floor and a longer [reflective] wall section opposite the drivers.  I got some very nice sound at times, but no real room loading I could build on.  Later, I got some nice sound and very nice ambience (when the power was good) with 7 wpc Wright 2A3 SETs driving the 97 dB DEBZs, but this combo would not load the room properly, either.  IMO, the ML2s are at the peg driving the DEBZs into a 17' X 21' X 8' hard-plastered room with raised, carpeted floors.  What there is of LF has some redeeming qualities, but nothing serious yet.  I am a hopeful guy, and I still believe I can tweak my way toward a more loaded room; but I am not where I'd like to be, with plenty of power to burn.

As we have discussed, much can be done with a raised floor if there is underfloor access and a way to solidly shore up the floor from the ground under it.  OTOH, the classic yuppie "apartment", with raised, carpeted floors and high, vaulted ceilings (volume!), and no way to shore up the floors, is the ultimate energy sink.

I am not sure from the little reading I have done on the subject, but I think there is a whole school of followers that aim the speakers directly at their ears and they do not try to load the room.  Duddleston (sp?), Geddes and some others, I think, might have some ideas for people who cannot or do not want to load their rooms.  I have no serious idea how they would do LF.  If I had to guess, I would guess biased plate amps or similar exponential power schemes.

Paul S

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