Had the exact same failure twice. They also sent replacement woofers. Didn’t realize that the LFE channel was so much hotter than music. With sub set perfectly for music, I’d switch to Netflix and the first space scene in Ad Astra started crackling huge. I have now set up the 4 pre set buttons on the Denon remote to have an Apple TV - Music preset with subs at 0 and Apple TV - Movies with subs at -10. And even then I sometimes think I hear a crackle. You’d think they (SVS or any sub manufacturer) could figure out a way to have a built in limiter....