I used to have the same problem. Then I got Event sp-8's I can easily hear the difference with slight EQ tweaks. I agree with the others....monitors/room
The size of the monitor really is not as important as the quality of the monitor and the quality/integrity of the signal you are feeding it. Before I switched to Dynaudio BM15's I used BM6's. I really did not have much of a problem translating low end on the 6" drivers. In fact, because of the way they ported, they almost put out a deeper low end with the 6" driver than with the 10" driver I am using now. You just have to learn how to navigate whatever room/monitor situation you have.
<You just have to learn how to navigate whatever room/monitor situation you have.>
Yeah I've been doing alot of research on room treatment the last couple of days, and it seems like I've got my room setup all wrong. Lots of weird reflections and bass problems. Thanks for your help people.