I use a Fishman Rare Earth Blender and plug into our church PA. I have a huge feedback on any A note. The soundboard guy likes to crank it up, and with 3000 watts, multiple 18" subs, multiple speakers throughout, that feedback really rattles your spine. Funny thing is that once the feedback starts, we (bass and guitarists) don't know who is causing the feedback and so we throttle back on our volume settings. Then the soundman cranks it up more, then the feedback starts again. By the end of the set, we're down to the lowest volume settings and we're at the soundman's mercy.
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