Speaker A/B Option With Separates?

I agree with Elevick. I would find a decent used receiver that you can hook the pre-outs from the pre-amp into and then have a seperate volume control.

I am not sure what the parasound left/right volume control gets you in the context of a multi-room application but it is no doubt a good option and I did not intend to slight the recommendation. By having a second amp or receiver you can play different sources in different rooms at different volumes. I have a multi-room receiver as well as an additional receiver in my system so I can drive my mains, kitchen, and screened porch at different levels and with different sources, i.e. the kids can be watching a movie and we can be on the porch listening to a CD or even vinyl if we want. I guess it depends on what you want to accomlplish in the end.