I am currently using a pair of Sonus Faber Mementos, wonderful speakers that go down to about 40 Hz with decent bass. Lately I've been getting a case of full-rangeitis and am considering using a subwoofer with these elegant little two-ways. I've always been reluctant to do this but am told of the benefits as well as the drawbacks in terms of coherence, tonal balance etc. Since I have a relatively small room a monstrous sub wouldn't be necessary, just something to catch the impact of a bass drum, low brass and percussion, and take some pressure off the mid-range drivers. Any advice would be gratefully received.