I agree with Ritteri on two counts,if I understand him correctly. 1. You need a full range speaker to properly implement a pair of subwoofers and 2. the most perceived improvment in sound from adding powered subwoofers comes in the midrange and highs. Might seem conterintuitive, but IMHO is correct.
Full range or sub/sat ?
Which give you what you want.I feel the best dedicated stereo only came from a pair of spica TC-50's and a vandersteen sub.The amp was a Musical fidelity B-1 or a B-2 I seem to have forgotten ( about 35 watts per ch. ).I felt the monitors got out of the way better than a full range with it's large baffle.