I have recently purchased an AVR55 and it has excellent rear channel output. Many sources do not have much rear channel information. Try playing a dolby-encoded music CD and see if the rear output improves. You may also want to borrow a pair of efficient rear-channel speakers made by a quality company. I also recommend inserting a regular CD player into the system to see if the problem can be isolated. If it isn't the source component or the rear speakers, the receiver may need to be checked over by a qualified technician.
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