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"The subwoofer puts out what maybe 20Hz if you’re lucky. So the iso system doesn’t actually have to be too heroic for subwoofers. The resonant frequency of the iso system for the sub would only have to be what about 8 or 10 Hz to be effective at 20Hz and above? The idea of course is to prevent subwoofer cabinet resonance to feed back to the rest of the system via the floor. The Super Stiff Springs will provide between 2 and 4 Hz resonant frequency for the isolating system depending on total mass on springs. So, let’s say your subwoofer weighs 100 lbs. For the lowest resonant frequency of the system you would use three Super Stiff Springs but since the subwoofer’s lowest frequencies aren’t really an issue - as they are for components when seismic vibrations are involved - four springs are recommended under the subwoofer for stability. You still have to isolate the rest of the components from seismic, subways, footfall and tap, i.e., all sources of structureborne vibration. But by isolating the sub you eliminate one big contributor to structural vibration in the room."