Hey y'all, thanks for all the help! I wasn't expecting SBAF to be quite this super and friendly. @bixby, you're right I'm playing Qobuz on my iPhone, AirPlay to the Apple AE, which feeds into the Bifrost via Toslink. Per your suggestion I tried streaming Apple Music (I know, lossy, but we're troubleshooting) from my MacBook Pro, and the same clipping at the same point in the track (at least the first minute). I can't find a USB A -> USB B cable in the house right now, to try something other than Toslink. I have one in my office on campus, but can't get there right now. Shit, it just occurred to me that the MBP has optical out, so I could bypass the Airport Express that way. I can't test that right now, I'll try it later. I tried gently pushing in on the woofers, didn't hear any scraping, thank god. I've had a niggling sense of dread that maybe I damaged my speakers with the Peachtree. It's possible I did, but I didn't hear anything pushing the woofers. The W5 does have a tiny tweeter on its back that's protected, and I can't press on directly. @tranq and @monacelli, I'm using new Blue Jeans cables. Not super cheap, but no quantum crystal tesseract magic. I have the Vidar and Freya S plugged into a Tripp-Lite power surge protector, but I got the clipping with my Peachtree (as @rlow mentioned) plugged into a regular power strip. No fancy power conditioning. Couple other great suggestions here that I'll get to later. Gotta finish some work before I can play. I could have waited to post until I had a more complete picture, but I'm grateful for all the support.