Question Speaker Selector Switches. Which one?

[Scratcher]

System specs are in my signature. The 8300A Has two sets of dedicated speaker outs with no switch (Set up for bi wiring)

I like to run two sets of speakers (Not at the same time) for different genres, but I cannot switch from one set to the other because the amp has no speaker selector switch. I did try an SP93V switch but it was a marked decline in sound quality. I'm a two channel listener but the MA 705s are my preferred speakers for movies and such.
I thought on an inline option for each set of speakers but cant source anything that might not degrade sound quality.

So basically I'm looking for a good quality speaker switch that is definitely audiophile quality or inline switches on my cables that I can install myself. Thoughts? Suggestion?
Thanks in advance!

 

[Al ears]

You'd be better off simply removing the speaker cables from back of amp and plugging in the ones you want to listen to. But of a pain I know but certainly will not be any degradation of sound quality