Nommo Chroma: USB audio is wrecked, Aux in works

A few weeks back, I started getting a little static when playing audio. It went away after a couple of days. Today, it started playing really bad crackling static when audio is playing, but the speakers are silent when there's no audio.

I tried updating drivers and firmware, and rolling them back. but no change. I disconnected the speakers and plugged them into two other computers and got the same result. However, when I disconnect the USB and play audio using the Aux In jack, the audio is just fine.

Any ideas how I can troubleshoot further or maybe fix this? I'm beyond my warranty, of course.