So I was running sound for a gig yesterday and had an odd (to me) issue with feedback from an acoustic guitar. The guitar was hooked up direct into a di box into the system. Sound check had no issues. two songs into her set she hits a note and it suddenly starts howling (in the 5-700 hz range). I turned down the gain a bit and it went away. She started the song over and 4 notes in hits the same note and it sets off howling again. I backed off the gain a bit more and it never had feedback like that again, but every time she hit that same note you could hear a funky resonance in the tone, but it didnt cause feedback.
So what the heck. Is it the pickup having problems? Di box? Purely a gain issue?
So what the heck. Is it the pickup having problems? Di box? Purely a gain issue?