JA Woll, now comes the Bass

Simply Great Shock resonance absorber under the heavy boxes from the early 90's years down and go to the fun with the bass control. At least complains now a little less of the residents under my apartment.
In real life and at moderate volume they bring a lot of parts, also no longer the boxes directly on the floor, which indeed may lead to losses in quality. Especially useful I find that one (if necessary) and several other and thus stacking / layers could. So a clever article unfussy and an (8-pack) adequate and fair price.