I can understand why you'd want to have good quality direct radiating speakers in the rear that are timbre-matched to your mains.....especially for multi-channel audio. But with bipolar surrounds, the speaker is sending the sound off the walls instead of directly to your ears.....so does this mean you can get lesser quality bipoles for the back than you would if you went with direct radiators? For example....I have designs on upgrading to the Paradigm Signature line.....they have di/bipolar surrounds for that line that are around $2200.....but the surrounds from the studio line (one step down) are only $990/pair. Would I really notice a difference if the signal is being bounced off the walls before it reaches my ears????