I'm going in from an RME ADI-2 DAC FS via XLR.What’s your source? I’ve had odd buzzing sounds sometimes when I turn the amp on while I’m BT mode but once I switch inputs it goes away. I can’t figure that out. I have Sparkos op amps in the volume stage and Staccato opamps for the input stage and I get more of a “pop” with the staccato op amps. Still my amp is very quiet, thankfully, after my very noisy Woo amp.
Opamps are 4x of the Sparkos 3602's. What headphones/iem's are you using, just so I have a benchmark for what "quiet" is haha.