I know this is kind of an old post but just wanted to let you know I have had an issue with rumble from my subwoofer and Planar 3 table when I turn the volume up loud. It was mainly due to the placement of table. I was getting this terrible feedback loop. I ended up using Sorbathane 2.5 inch half spheres under the feet. I placed them flat side down on the shelf and round side under the feet. This completely eliminated the feedback issue. I can beat on the shelf right next to the table with my fist and hear nothing from the table.
Best T/T Pods/ wood blocks to eliminate vibrations
My table is 3 feet from the right speaker. When the tonearm is in play, knocking on the table plinth or dust cover creates an amplified thumping sound. The table is a Rega P3-24 and has THREE rubber cone feet that are not removable (There are two in the front and one support in the middle at the back of the T/T. The table sounds good, but I know that feedback is degrading the sound. Need recommendations for either footers, pods, points, or blocks to eliminate that thumping sound. BTW, I can not use a wall shelf because the walls are concrete, and also cannot be drilled
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