No, although I'm part owner of Harman International, I don't use an HK. I also don't think that the sub out levels on the various receivers would vary that much, but maybe some unit does have a somewhat lower voltage at its zero setting and 9 o'clock on the sub would be needed to match up with this. In any case, whatever the settings wind up at, it's okay just so the level is correctly calibrated.

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Enjoy the music, not the equipment.