For manual XLR selector, check out the Goldpoint
https://www.goldpt.com/sw2x.html
If you want 12V trigger XLR selector, there's an Australia made ARX RS-1 remote switcher
Balanced switch for preamp output
My Ayre KX-5 Twenty is connected to a VX-5 Twenty amp that drives a pair of KEF Reference 1s. I'd like to alternate to a pair of Parasound JC 1 monoblocks driving Magnepan LRSs. Can anyone recommend a passive balanced switch?