Yes, felt wouldn’t defeat the function of any isolation device.
It might, depending upon its thickness, initially alter the base resonant frequency of the supported device, but should soon enough be crushed flat enough to make no difference for most devices.
Spring suspended turntables are a different matter entirely.
It might, depending upon its thickness, initially alter the base resonant frequency of the supported device, but should soon enough be crushed flat enough to make no difference for most devices.
Spring suspended turntables are a different matter entirely.