Six speakers in paralle would be a load of 1.5 Ohms, most HT recivers are desinged for 8 Ohms.
What I did was to keep the old reciver and split the speaker load between the two amps. I put a Y cable to split the CD player feed.
There are Pro amps that will drive a 1 Ohm load but they are BIG $$$$$.
Most Recivers that have two speaker outputs put the speakers in series when both speakers are on, this make the load 16 Ohms.
The seletcor will have be able to maintain a 4~8 Ohm load on the amp, thay may have resistors that switched in and out to do this. John
I have six pairs of speakers in different rooms and outside. Each pair has a volume control in that room. The selector I currently have is basically a bar splitter receiving input from the receiver via one speaker wire. It was installed by a flake several years ago and has never worked right. The receiver (an older 75w Denon) often cuts off when trying to push all six pairs. I am going to buy a new receiver (Denon 2807) that has multi zine capabilities and want to replace the strip with a selector and possibly new volume controls for each room. I have seen seen selectors by Niles and Monster. Anyone have any experience in this area.