Will the amp or speaker get damaged?

i would think a speaker selector would be the way to go if your intent is to use both speakers at the same time & it would take away the chance of amp or speaker damage.

mike.

Bryston makes a well-respected switch box for those purposes. It has three outputs for three sets of speakers (a single input, or course). I recall reading of a reviewer using one of these units to compare speakers claiming that it did not introduce an audible coloration to their ears.

Marco

If you want something cheaper than the Bryston, Niles Audio also makes a switch box. My local dealer uses a Bryston switch in his setups. This is assuming you don't want to run both speaker pairs at the same time.

Your amp would probably be ok with both speakers in parallel but in general you shouldn't submit an amp to that because the speaker impedance halves. Since B&Ws are not efficient, it would be a tough load if all 4 are used simultaneously.