I auditioned a Supercube II and thought it was a great sounding sub. I know it cant go as low or as loud as others due to its size but what impressed me was the tightness it had. Probably a better sub for music than HT. My question is these other subs that Craigsub test are they comparable in the clean tight sound that the Supercube produced. I'm interested in the PB13U, MFW-15, and Castle or in that price range. Does anyone have first hand experience of the Supercube and any of the others?