We tried to start over by unplugging everything and then just connecting the sub to the receiver. The buzz, hum, crackle was there. We rerouted electrical as much as we could & still there. We purchased a Viewsonic TV coax isolator, but that didn't do much of anything. Next up - New audio cable to the sub and an isolator along that connection.

Really annoyed by this. We tried to watch Heat Friday night and I had to turn off the sub it was making so much crummy crackle noise.