Dear friends: There are other improvemenst when you mate subwoofers to your home stereo audio system, example:
Usually the location of the speakers in our room ( with out subs ) is a " compromise " ( trade off ) between the best performance at the bass against the best performance at the mid/high frecuencies ( only in a few cases the location is with out any " trade offs ". ), when we integrated the subs in our audio system we can have the best of both " worlds " and you will be in " heaven ".
Now you can really know how good ( or not ) is not only your audio system but any single audio item: cartridge/tonearm/cables/TT/preamp/amplifier/CD, and now you can detect any sound reproduction performance problems in those audio items and try to fixed/exchange: now and only now ( not before ) you can say " this is the best cartridge or tonearm or SUT ,etc.. " that I ever heard.
When your subs are settle-in in your system you don't have only a great high resolution system but a truly full range audio system in favor of the M U S I C .
Really, you don't know what you have ( the great potential of your system that right now you are loosing. It does not matters what you have. ) till you have yours: subwoofers. It is a pleasure that you can't imagine !!!!!!
Regards and enjoy the music.
Raul.