It's one of those ignorance is bliss things. Once you know where the issues are, you just gotta fix em.
This is where you can really start to pin down your subjective taste and correlate it to an objective result. Once you start to measure and tune you are on the road to what is possible. Your $ will go much farther when you can rationalize cause and effect relationships. Don't buy anything yet. Figure out where in your room the M22s roll off naturally without a sub. Then add the sub. Doing both at the same time is fighting uphill because the sub will null the M22s response until it is put in phase with them. You should be able to get a good response down to 30hz or so if you mess around enough.
