What I do, and it's worked well for me for years, is set the lowest reading speaker to "0" and everything else "up" from there.

Does ot help? I dunno, but at least I know I'm not attenuating anything, and I'm not asking any nondiscript and ununderstood(is that a word?)circuit to do anything heroic on my account.

That, plus the fact that my Onkyo can also be set to an absolute reading of zero to a hundred, and if I get up much past eighty, I get nervous.

And can't hear, either!!