Yes, you can do this. The easiest way is to use a HIGH QUALITY speaker selector switch. Luxman and Van Alstine make these. I haven't used the VA box but it looks good. I regularly use a Luxman AS-50R for making A/B tests on speakers.
There is a current thread on the speaker forum regarding this very subject.
Warning: you are going to get a lot of advice and flack about your inquiry here. Apparently selector switches are the root of all audio evil. I would agree with that re: cheap selector switches but I have never noticed a degradation in SQ from a good box. Keep the cables from the box to the amps as short as possible and utilize the same speaker cable that you use for your speaker runs and you will be fine.
There is a current thread on the speaker forum regarding this very subject.
Warning: you are going to get a lot of advice and flack about your inquiry here. Apparently selector switches are the root of all audio evil. I would agree with that re: cheap selector switches but I have never noticed a degradation in SQ from a good box. Keep the cables from the box to the amps as short as possible and utilize the same speaker cable that you use for your speaker runs and you will be fine.