A noble experiment with Isoacoustics Gaia 2 feet & matching carpet spike pads for my speakers ended the other day. I had bought the Gaia II as used but in near perfect condition, and had to pay full price for the carpet pads. There-in lies the rub...the carpet spike pads didn't reach any further into the carpet backing nor the thick synthetic pad beneath, so any gain in isolation was negated by the speakers being just as wobbly as the stock M8 x 40 spikes. Those are made from black oxide treated brass, and the tips rounded off too much to penetrate and get to the wide-plank pine subfloor.
My solution was to order some M8 x 50 stainless steel set screws and put a sharp 30° angle on the tips. The longer length is just what was needed to finally get the speakers firmly planted. I will be honest and say that these speakers are so inert that I don't believe the Isoacoustics Gaia II do anything. I sold both the Gaia II and the carpet pads quickly, so the whole experiment cost me about $30. I can live with that.
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