Why not buy a cheaper seprate amplifier for the distributed audio. Connecting a string of speakers and the B&W's to a PS with or without the speaker selector box is like using a BMW to do farm work.
For distributed audio you could use the new Parasound 275 amplifier which has a 20 and 40 Hz filter, A&B speaker outputs, and a low impedance switch. This amplifier is really designed to do what you want it to. A cheaper solution would be one of the AudioSource amps. I use them in lots of installations for background music because they are relatively inexspensive and have features that are useful in multi zone aplications.
My 2 cents.
For distributed audio you could use the new Parasound 275 amplifier which has a 20 and 40 Hz filter, A&B speaker outputs, and a low impedance switch. This amplifier is really designed to do what you want it to. A cheaper solution would be one of the AudioSource amps. I use them in lots of installations for background music because they are relatively inexspensive and have features that are useful in multi zone aplications.
My 2 cents.