by Neil Bauman, Ph.D.
A man explained:
I found an interesting effect with my induction loop system. Seems if you turn up an electric guitar, the sound from the induction loop gets picked up by the guitar pickups and broadcast through the guitar amplifier. Ever heard of this before?
Yes, you are not the only one to discover this phenomenon. It can be a problem when you loop the platform of a church or auditorium and then want to use an electric guitar up there. The electric guitar pickups are basically t-coils so they pick up the varying magnetic field from the loop system if they are close enough to it, just like the t-coils on your hearing aids do.