You should check also Vanderstein subs. The 2wq is extremely fast and tight and probably one of the most musical sub on the market. As a rule of thumb if you shop for a sub for music, sealed designs are the most musical and fast. Note that I am not talking about subs with passive radiators,.like for ex. the sunfire sub, because the passive radiator acts like a bandpass. I know that the 2.5s are power hungry and your amp might have a little problem driving them, which surely explains the lack of bass, in my oppinion 30w is not enough. If that is the case, I definetely suggest that you go check the Vanderstein as they have a very good solution to free up some power which will in turn free up the midrange and highs. Go check their website at www.vanderstein.com. To end this I can only tell you that buying a sub might only be a temporary solution for the innability of your amp to do bass. Try an amp with more power first to see what happens because I know that the 2.5s can definetly do bass.
Natural sound (REL Subwoofers)
I am looking for a natural sounding subwoofer, and I hear that REL makes some of the best in the business. I am interested in the REl Stadium and Stentor. Has anyone had the opportunity to try these subs or make comparisons to similarly high-priced subs? I have heard less expensive subs like Sunfire and Velodyne and they seem too boomy, and therefore not worth the money...I am looking for something that will add ambient "space" to my music. I have heard the Snell 18" subs that go with the reference "A" speakers ...very nice sound but too big. Others that I am considering are Audio Physic, and Talon. Please tell me about your experiences, preferences, and biases. I have an aleph 3, proac 2.5s and plan on running them straight from a resolution audio cd55. Thanks