[BScout]

You haven't specified what speakers you are using, but other than the annoyance of the pop, those pops should do no damage to your speakers. You can check with the speaker manufacturer, but those re-clocking pops aren't DIRAC spikes or full scale signal and speakers can handle those easily without damage.

I honestly don't know a standalone DA converter that mutes when reclocking. The only ones that handle that easily tend to be ones that SRC any input (so they aren't actually reclocking but just resampling the digital signal on the way to the speakers.) I know a few makers who have that.