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Major Tom said:Well, the obvious anwer is to turn down... But aside from that, the only thing I can think of is that there is a resonance caused by the size/shape of the room - try moving it to different places. Or maybe its kind of small in there and the soundwaves are bouncing back off the concrete walls in full force against the guitar, vibrating it and causing it to feed back. First, try facing it into the longest dimension of the room. If the basement is kinda empty, put some stuff in there - scraps of carpet on the floor, huge heaps of dirty laundry, carboard boxes, black velvet paintings of Elvis, expensive acoustic panels, anything to help diffuse and absorb the soundwaves. Thick fabric stuff like blankets on the walls would help. Other than that, you could try to find the offending freq, and knock it down with a parametric, or even graphic EQ. Every amp I ever played in any unfinished basement always sounded harsh and ugly.