Popping sound

@gdaddy1 ...and +10 for the Chat GPT tip....
Can't think of a less biased info source for now... 👍😎

It could be a tube. In this case the problem would most likely manifest itself even if the music is not playing. Other problems could be as mentioned above capacitors. 
It might also be power or digital connection related. You have powered speakers - is the popping sound in the bass region or in higher frequencies?

I would rule lout tubes first. Swap tubes left to right and see if the problem moves with the tube to another channel and go from there. 

The way my system is set up and my physical condition it’s just about impossible to access things such as speaker leads.  I can  swap tubes out though.  If that doesn’t work I’ll live with it.

@ghdprentice Giving the list of equipment is really important. The more information you give the better the result. I have used it several times with excellent results.

I stream from a laptop using Audirvana and one day, out of the clear blue, the music would just stop playing in the middle of a song for no reason. I could not figure it out for several days.

I gave GPT a list of all equiptment and it came back and asked me what make, model of the laptop and what operating system. It came back with a specific list to follow and was dead on accurate. I would NEVER have figured it out on my own. It did it in about 6 seconds and worked perfectly.

I used it also for a bilge pump problem on my son-in-laws boat. Again it required all associated equiptment but it did give an accurate assessment for correction even including part numbers.

Welcome to the new age! 

Welcome to the new age indeed. Enjoy the music