Weird "chirping" noise from firewire interface

I’m getting this weird “chirping” noise from 3 different laptops and 3 different firewire interfaces (2 Firestudio 2626s and a M-Audio Profire 2626). It happens when using high gain on the mic pres and I’ve tried isolating the grounds on every unit so it’s not a ground loop. It’s very annoying… Anyone have any ideas?
Chirping Noise.mp3 (293 KB)