My room has an open archway into our kitchen on the back wall, two large sliding glass doors on one side wall, high ceilings, and two more hallways leading off of it. With the Thiel sub and controller, I could adjust for optimal crossover point, but I could not account for the "bass suck" in certain frequencies from my room. Shari felt that I would benefit from the range of adjustable parameters and EQ-ing offered by the Digital Drive series, and I, too, was very impressed! I was even more impressed when I fired up the DD-12. It has been, by far, the most significant upgrade that I have made to my system, and I do not think that I could have achieved results this good without the diagnostic and tone-shaping abilities of the DD-12.