Thanks for the info Tekdredger. The Yamaha does NOT have features for channel calibration, all it has is Large and small settings for the speakers, Bass out is Main/sw or sw and Main level at 'Normal' or -10db. However the Normal and -10db would take care of any apparent volume disparity, I suppose.

In view of that, it may be best to upgrade....Sigh. $579 for 2 M200's vs a 950 and a 5 or 7 channel amplifier....This will take some time to think through