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I was going to post pretty much the same response...

...when I saw yours. The frequency range possible from SACD goes out in the ultrasonic range to ~50kHz. Some amplifier topologies appear to have trouble with ultrasonic frequencies, causing distortion and oscillation. I remember reading a caution when I had the Sony SCD-777 SACD player that one shouldn't use the switch on the back in the "full range" position (or something like that) unless you were sure that your amps behaved nicely with the ultrasonics present in the output. I never had any problems running "full range" with the tube amps I was using during the time I had the SCD-777. This reason also explains why RBCD is fine - brick wall filters take out the ultrasonic info.

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