Originally Posted by goros
I use ERD-1's in Bipole for heights in my 11.2 system because I can't make monopoles fit in my setup with the ceiling clearance that I have in my house (13x18x8, main seating is 11' back).
Just because it isn't optimal, doesn't mean you don't do it at all.
Also, Atlantic makes bipole heights SPECIFICALLY for PLIIz height channels. Audyssey insists they will mess the world up and suck.
My personal experience differs. The sound is hands down amazing. Would it be better if I could set it up optimally and put identical voice matched monopoles 14' up the wall and pointed down at the correct angle?
Probably. But since I can't crap out 6' of additional ceiling height in my living room, my meager 11.2 setup with Bipole heights will just have to cope with being "Imperfect".
Way better than not having heights at all, or having monopoles in the complete wrong configuration.
For wides, you need to match the other speakers in your main soundstage (L, C, R) as closely as possible. A crapload of information comes to those channels and you will notice a difference in voice matching.
For the record, my 11.2 system consists of:
Emotiva XPA-5 Left, Center, Right, Wides (MC305)
Emotiva UPA-2 Rear Surrounds (MC305)
Emotiva UPA-2 Side Surrounds (ERD-1, Dipole)
Emotiva UPA-2 Front Heights (ERD-1, Bipole)
7x CSW MC305 MTM Acoustic Suspension LCR's (80hz-22khz, 92db, 150watt)
4x Emotiva ERD-1's (80hz-25hkz, 89db, 200watt)
2x Klipsch Synergy Sub-12's
Audyssey MultiEQ XT32 sets my MC305's at 70Hz or 80Hz (I run @ 80) and my ERD-1's at 90Hz and the sound is, hands down, amazing.
I run everything in A-DSX and it sounds perfect. Even if it's "designed for monopoles bla bla bla", bipoles as ambiance/effects channels, bipoles do a pretty good job, and there is so little information coming from your heights, you really shouldn't need super-large, powerful speakers up there.
Rainstorms and thunder sound like they are coming from the sky, helicopters, flyovers and dragons (ie, how to train your dragon bluray) all sound exactly the way they "should".
If you want them, and have the money for them, pull the trigger (although I'm not certain dipoles would be right for your front soundstage by design, if they switch to bipole, I'd do it in a heartbeat).
When I do a real home theater in my basement in a few years, I'll follow the Audyssey recommendations. But since I can't right now, bipoles do the job quite nicely.