Emu XL-7 & MP-7 User's Group

I multi-track my music on Fantom X8 & EMu MP7.  I do vocals on Akai
DPS12i + DPS16.  I monitor through a pair of Event PS6's and/or Sony
Studio Monitor Headphones.  

Problem: I have made CD's from the DPS and from the Fantom.  My mixes
on both always come out bass heavy and muddy. Is this a frequency (EQ)
problem or a monitoring problem?  Would a sub-woofer help in the
mixing process?  Is this a possible problem with the bass or kick drum
patches that I am tracking?  

Again, the overall mix is find.  I'm just not getting a good reading
of the low end in my current setup.  Any help would be much appreciated.

Rev-P