Avian, a 70% volume setting shouldn't be worrisome. Since you didn't mention it, note the end of my previous reply. It's unlikely, but there is a setting that drops the main speaker levels(i.e. if they're too sensitive in relation to the other speakers)by 10dB. If you haven't done so, double-check that it's still at the normal 0 setting.

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Enjoy the music, not the equipment.