OrganiCaliYes, thanks for asking. We have found the culprit -- the wrong capacitor was installed in the power supply, which raised its noise floor. We are checking all units to make sure that's not the case anymore.
HTvishThe noise floor became audible with certain headphones. While it's not theoretically possible to avoid all noise, DACmini is pretty darn quiet. We are doing 100% testing on the stock now, so bad units should not be showing up in the field.
HTvishA couple of people were affected, they sent their units in and we fixed them. We are not aware of any others. We check these things thoroughly, but one batch had a couple of rotten apples. We apologize and have further improved our testing criteria. You should be fine. We are watching for this now.