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.
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