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On 12/06/2012, DAVID BURNHAM wrote: > These all sound like good ideas; however, I find I'm plagued with air > borne acoustic feed back. My speakers are on a concrete floor and my > sound equipment, including the turntable, is in a shelving unit built > into the wall surrounded by isolating rubber and behind a large glass > door with rubber surround. The feedback frequency is sub-sonic, (more > felt than heard). > This is why you want the turntable to have a fundamental frequency of around 0.5 Hz or less. Regards -- Don Cox [log in to unmask]