I know this is an old topic, but did you resolve that issue with the bluetooth scratching noises? I'm experiencing the same thing intermittently with a R20B. I'll probably be sending the unit back for a replacement, just not sure if a new one will have the same problem.
Hello, I recently bought a Klipsch R20B soundbar and am overall happy with the purchase. I have the wireless sub woofer cranked up about 2/3 of the way and notice a constant faint rumble/crackling noise and occasional pop even when no sound is being emitted. This is noticeable at low volumes as well. I figured this could be due to interference from my wireless internet so I changed router channels and have it set to broadcast at 5 GHz since I believe the wireless sub operates at 2.4 GHz. This didn't solve the issue so I went through the factory pairing process which didn't help either. This is my first soundbar system so wasn't sure if wireless sub wooofers tend to make these types of noises? I'd appreciate anyone else's thoughts on this. Thanks!