addition of 2nd pair of speakers

Bryston unit does not provide protection for speaker or amp. It is only a switching device. I mis-spoke in my earlier post on the protection segment. Thanks to rantes7 for bringing it to my attention, he having checked with audioadvisor. My checking the unit and the schemactics confirm such. The unit made to provide the best sound quality possible. The protection left to proper matching of sets of speakers, ie using both 8 ohm speaker pairs. Along with amp that could handle 4 ohm load when necessary. My experience with my gear has never encountered any problems. I've used the Bryston with different sets of gear.
The Parasound unit according to AA has impedence matching.
Sorry for any confusion and thanks once again to rantes7 for bringing it to my attention.

I bought an Acoustic Research AR1108 at a pawn shop to switch between two sets of tower speakers. It worked perfectly. It has built in protection circuitry. I ran it off my B&K 200w amp. I did not hear any audio degradation at all.

http://www.ambientweather.com/ptrcaar1108.html

http://www.amazon.com/Acoustic-Research-AR1108-8-Position-Selection/dp/B00005I9QH

Bill

Thanks for the reply, this has been helpful for me.

Adcom also makes a speaker selector switch. Does anyone know how it compares to the Bryston?