Ott did you realize on the A7x's that besides the 3 shelving knobs there are woofer an tweeter volume knobs on the back.
They are hidden under 2 rubber plugs beneath the 3 shelvings.R= bass, L=Tweeter

Ott responded on 09/01/2012

I didn't but I do now. I shall experiment with them and report back.

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