Bruno, there's no audible difference(including distortion)when an amplifier with a higher maximum output capacity is used unless that higher max is actually used; unused headroom is simply that: unused.

For a comfortably loud average level in the mid 80s of dB level, only about 1 watt is needed. A 1000 watt amplifier won't be different from a 10 watt amplifier there. Brief split-second peaks will use much more, of course, but not likely anything that typical receivers(such as your 890)rated anywhere in the 100 watt area can't handle with audible transparency. You, not the amplifier, are in control of the loudness level.


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Enjoy the music, not the equipment.