If you're still looking, here's a few:
Kramer VS-4X 4x1 Balanced Stereo Audio Switcher (XLR)
Nobsound 3-IN-1-OUT XLR Audio Switch
Coleman Audio MS6 6-channel Auxiliary 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?