@blackbag20 I did not use any splitter-box because the 2 DACs I used, the Musetec 005 and the Benchmark DAC3B both allowed RCA and XLR output at the same time. So one RCA went to 1 preamp and the XLR output went to the other preamp. I did the same with my Magnum Dynalab 108T tuner. I also had identical streamer paths using 2 sets of FMC and Sonore OpticalRendu,
I am a fan of the low cost Benchmark XLR interconnect between my 2 preamps and the amp at the speaker end. So I used 2 sets of 15-foot XLRs with 1 set connect at the amp end. When I wanted to switch preamps I just changed the amp end interconnect to the other preamp’s.
The CODA 07x preamp I used as 1 of the 2 preamps did not have an ON/OFF button so that was a little bit tricky. You need to be careful when the gear was turned on and off so as not to mess up the speakers. I never did.
I should add that not all gear allow RCA and XLR to be connected at the same time, such as the Audio Mirror Tubadour SE III DAC (now sold).
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I am from Toronto (YYZ, similar to LAX = Los Angeles) . I now live in Santa Barbara. I am huge Rush fan. I actually listen to more Rush these days since I have nice gear and the music is instantly available. The song YYZ is supposed to represent taking a flight out of Toronto’s YYZ airport.