Originally Posted by DS-21
I've found that I prefer the presentation from high-mounted omni-ish surrounds as well. My current ones are upfiring 8" Tannoy Dual Concentrics. That is overkill. I don't think surrounds have to be particularly good. If I were starting from scratch I would probably use the cheap Pioneer 8" widebander designed for ceiling speakers. But I had the drivers, so why not?
I have DC's like you and have done some surround channel testing using my 8" DCs compared to the 6.5" ICTs (full-range crossover-less for those that don't know their Tannoy drivers
). I switched back and forth for about an hour between the two and really could not discern any appreciable difference when crossed over at 80 Hz.
Even though I have many other 6.5" and 8" DCs, I'm going to go ahead and run two pair of ICTs for the side surround and a pair for the back surround; all upfiring as my room is only 12' wide and this configuration should really help to make them less localizable. The ICT is a 4 ohm driver and there will be one to the side of each row of seats, with a series connection for an 8 ohm load.
I have to watch the impedance as I'm using an Emotiva DMR-1 receiver rated at 125x7 into 8 ohms with no rating into 4 ohms; I figure it will be fine for the two back surrounds since there is very little data coming from them. Front three are System 1000 and at 94/dB efficiency should yield plenty of output.
How high do you have your surrounds mounted?