See the below link for a recording of this strange sound I took from my phone's mic. Dropbox - Bass Sound.m4a The bass is a yamaha TRBX 504 with active dual coil pickups. The PA is a power EV ZLX-12P. I am plugging directly into the powered PA, but I've tried going through a DI Box, mixer etc and it is still there so it can't be a ground issue. I can't figure out if its something with the bass or something with the PA. I find it hard to believe it is caused because i'm not using a bass specific amp as people play through PAs all the time without issue. Can anyone help?