Hi Jennifer I just dealt with a similar issue, crackling coming from both speakers. Swapped out a bunch of tubes didn’t help. I started to think it sounded a bit like RFI. I had recently moved my modem/router to my listening/living room. I turned the modem off the crackling was gone. Moved the modem to a higher shelf problem solved. Another source of noise can be light switch dimmers. Can you share any more details on your setup?
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I had a similar problem with crackling and a hum through the speakers. I had recently added a Nordost Red Dawn (flat cable) IC and thought it was defective. I was just about to return it when I decided to unplug the wall whart to my Ikea turntable lamp. Problem solved. Check around and see what is plugged in that could cause noise and remove them one at a time. In my case, my Nordost cable is unshielded so it picked up the noise. Good luck!
Guys I was able to solve the issue after some online research. In my case it was basically a Windows issue as described here. But think since my speaker works on Wifi it can have a similar issue too. But since my wifi router is in the other room, I could safely eliminate that cause.