I can tell you that while at AXPONA I was in the Credo Audio / EMM / VPI room where the HW-40 was being used. While in there HW, at an opportune moment, started pounding on the rack the HW-40 was sitting on while it was playing. Not a ripple in the music. I'll be the first to admit I wish my Avenger was that good at isolating from external structure borne vibrations.