Okay, it appears that I had my SST2 set at 2 volts instead of 1.

My other amps were set at 1 volt. I may switch the SST2 back to 1 as I got use to having the surrounds 6 db louder than the fronts.
This also seems to be the reason I was getting slightly boomy bass in Pure Direct 2 channel stereo mode.

Having said that, I still prefer MC stereo with enhancer over Pure Direct 2 channel. The bass is more articulate & highs marginally more linear.
