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Reciever impedance ratings never directly effect sound quality directly. (You can get good or bad quality from a low impedance or high impedance receiver.) If a receiver can run 4 ohm speakers in what I'll call "native mode" (no switch), then that receiver is sturdier in that it can supply more...

Robert hit it all, but just a couple of elaborations ... Regarding receiver/speaker power ratings. The receiver spec is peak power, and the speaker spec is an average "endurance" rating. To make it worse, power is not linear, it varies by frequency, so saying "90W" is correct for a specified...