I am currently using the Zone 2 output of my Onkyo TX-SR606 receiver to provide music throughout my home. The output from the receiver goes into to an AudioSource AMP100 amp, which has two speaker outputs. Output A goes into a speaker selector which feeds 5 pairs of in-ceiling speakers (Polk Audio RC60i) controlled by individual impedance matching volume controls (Xantech VCD100). The sound quality in this setup is pretty decent and the volume is more than sufficient for our purposes. Things have worked out so well that I would like to add more speakers. I want to add two pairs of speakers to the existing speaker selector, again each having its own impedance matching volume control. In addition, I want to connect a 4 pair speaker selector (with impedance matching and volume control) to Output B on the amp for another 2 pairs of speakers in my basement. This would give me 9 pairs of speakers (7 on Output A of the amp and 2 on Output B) and they would all have impedance matching volume controls between the speakers and the amp. I am wondering if all of this sounds reasonable, or will I start running into issues at some point?