Interesting reading, Jason. Yeah, Rotel apparently wants to keep the crossover frequency a secret(a direct contact might pry the information out of them), but those older HT receivers with a fixed crossover often used 100Hz, so that would be my guess.

With the difference that you've noted with the CC-370, it might be worthwhile to turn it off and at least as an experiment try using the M50s to form a "phantom" center to see if the overall effect was better.

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Enjoy the music, not the equipment.