[Jeff]

Lane, The subs will be powered. They would get their signal from the sub out port.
Could I then run the loud speakers from the sub using the left right ports on the sub?

Flipper, I believe the volume controls have Impedance control, but will research further.

Gogar, I have A mix. In one room I have in wall speakers & in the other 2 I have floor standing. All three rooms are going through a remodel so hiding the wiring shouldn't be an issue. I'm trying to steer away from in- wall subs as I've found I can find better sounding speakers in a freestanding model $=$.

Would this work?...

For each pair of speakers, L/R wire would leave the receiver, go to an Impedance / Volume control, continue to the sub and then out to the loudspeakers.
Being able to control the volume of the sub & the speakers simultaneously.