I purchased 2 of these for my left and right tower speakers in my home theater. They have done exactly what I hoped for in really cleaning up the sound. I took the feet off my speakers and placed them directly on the SubDude 2. My speakers are JBL ES80, with 2x6 bass drivers, 1x4 mid, and two tweeters; one a super and one of less higher frequencies. It is fed by a NuPrime STA-9 amp from a Marantz SR7008 being used as a preamp with Kimber Kable speaker cables and interconnects. The obvious proof was when I played the death metal band Nile at around 50% power. Being that the song was all double bass, everything down tuned it was really nice that I could pick out pretty much each part of the song without straining. The bass guitar line jumped out as its own entity (as a guitar player I dont know if that is good or not, but in this case it was) and everything was well defined. The same has held true in the home theater applications.