Shaun, subtlety was not a descriptor I was expecting when discussing subwoofers. But that's a good thing, as it is a very positive quality to have in this case. Makes me feel encouraged to try it myself now. Last thing I want is overbearing bass booming away in the corner...I feel the headache coming on just thinking about it.
Did you get just the one unit? How big is your room? The Yamaha has an 8" cone, correct?