Thanks for that link -- I will read that thread carefully to discover what I can learn about subwoofer / bass management for my room.
Believe it or not, I have several Classical Music CDs recorded in London studios where it wasn't possible to keep the invasive low-frequency rumble of urban traffic from becoming a permanent part of the performance. This is especially evident during quiet passages of music, when the thunder of large trucks can often be heard unmistakably as they accelerate in first gear after being stopped at a nearby traffic light on a street outside the studio. This might actually be the
deepest bass I am likely to encounter anywhere in my CD collection, and though it makes me smile when I hear it due to its accidental (and whimsical) appearance on a recording, it is probably a good example of heavy bass emanating from a subwoofer that might need to be tamed...