I just added a DAC with a tube output stage going to a Denefrips amp. The source is a Cambridge streamer. Adding the DAC, every time I start a song there is a noticeable pop. It's a single pop. I changed cables from the streamer to the DAC but it's still there.
If I remove the DAC, and plug the Cambridge directly into the amp, there is no pop.
What can be causing the pop? I'm guessing it's a grounding issue but I'm not sure how I fix this.