I recently attempted to start recording with my old audio interface (Audio Kontrol 1) in my new laptop (Windows 10), and got a horrible high-pitched metallic noise (specifically 3 distinct peaks between 7-10kHz) whenever I activated the phantom power. I tried it with my old desktop (Windows 7, drivers already installed) and it worked fine. I tried it on my work laptop (Windows 10) and the noise ocurred again.
My guess is that the laptop batteries might be causing some sort of ground loop problem with the interface, but before I buy an expensive USB isolator I would rather ask if anyone thought it could simply be the old audio interface (perhaps driver incompatibility with Windows 10?) or some advanced setting. Any ideas or personal anecdotes will be appreciated!
To be clear, the noise is there no matter the amount of sound going in through the mic, and laptops have been plugged in and unplugged. I have tried EQs and ReaFIR with improved but still unacceptable results.