You're right, if you want HUGE bass as a priority with Rock music or the like, then, yes, get the Inner Sound. I used the Inner Sound with the Quad 989's for a review and, yes, the only qualities that I found commendable in the amp are the same ones that you want. Given that, you might also want to look into some other speakers that, er, amplify the qualities you seek. I've seen other people on this site recommend Cerwin Vegas speakers. Try those! Good luck!
