Yesterday I played in my church's worship band. After the first service (My church has two) I had to switch to a wireless mic because my Ampeg BA115 was apperantly causing the speakers and moniters to hiss so bad that it was distracting the singers. The only thing was that the hiss was still there in the second service, so that makes me wonder. I said that I have to have some treble boost so my B-string doesn't get muddy, and that causes a little more hiss out of my amp. My question is mostly this: is my amp interfering with the other speakers on its electrrical circut? I didn't notice much more hum out of the moniters than is normal for a speaker with power into it with no sound. If I could get this straightened out by this Saturday it would help, since I'm playing on Easter. Thanks.