Ken,

The power supply is fully capable of supplying the maximum power of all channels together.

My Denon for example is rated at 90W/channel x 7 channels. That's a total of 630W. In fact, it's capable of a lot more.

I can in fact pull out all 630W...and more. Don't let anyone deceive you by telling you that just because you have an integrated receiver rated at 90W/channel, you can only pull 90W out. No way! It's 90W x the number of channels.

Do you understand?

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated