Yo,Jeffie; Best to turn everything off when switching amps and pre's. Everybody's hearing is different. For me I would listen to one setup for a full day say 6 hrs--- Then 2/3 hrs of the same, the next day. Then the other setup; likewise. AND leave things powered up overnight this is critical with ss amps. I remember driving myself crazy (saves on cab fare) trying to a/b two dacs.-- 15/20 mins. on each.(Yes, that's how I got this way.) I ended up buying neither. I just bought a different dac. (From a dealer with exchange option) --- About 2 mins. on the Theta Gen5, I knew "this" is what I was looking for. The other dac was the Res.Audio dac.---3rd being my Theta pro basic2.
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