I found a little known tweak that can greatly enhance your listening pleasure. After a lot of fiddling with my PB12 Ultra I have cured most of the issues I was experiencing. I had been searching for the chest-thumbing-headpounding-ball aching bass I had heard so much about but still wasn't getting it. Anyone in this position can cure this instantly with a little know HC guru tip: Turn up the Volume you ****! Yes, I was said **** There is, however a good reason my volume was set to a sensible level... the rest of the system can't keep up I was warned but now I see the light, my lovely SVS is going to bankrupt me in search of equivalent sound from the rest of the system. Anyone considering buying an SVS be warned, they are a hard act to follow!