First off the +/- 3DB means the speaker is within spec as it allows for a 6DB swing.

I'd say 60HZ would be a tad low for all but the M22s. If this were my system I would try a 100HZ crossover. With you liking what you hear when using a lower crossover could mean that the sub you're using is even less capable to reproduce lows than the M22s.

An upgraded sub might do your system wonders.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud