A little test. Without the turntable spinning, place the cartridge on a record as if you were going to play it. Slowly advance the volume control. If, at some point, you hear howling out of the speakers, turn the volume control down very quickly. Post back into this thread with the results of this test.
If this happens, you have acoustic feedback. There are two paths for acoustic feedback. Structure borne means thorough the stand that the turntable is mounted on, and air borne means through the air.
If this happens, you have acoustic feedback. There are two paths for acoustic feedback. Structure borne means thorough the stand that the turntable is mounted on, and air borne means through the air.