Just tried it; there's an extremely minor hiss/high-frequency buzz, but the volume is so low that I have to have my ear within a foot of the speaker to hear it. Possibly more of an issue with more sensitive speakers is my guess, but definitely a 100% nonissue for LS50 Meta. This is with the volume turned up enough to play average about 65dB from 10 feet away, but then paused.Would you mind testing the amp’s unbalanced inputs from your Ultra’s analogue output?
-Ed