Music in the 40-80 Hz range

I've been low-passing at 40 Hz with a 24 dB/octave slope to a pair of Velodyne HGS-10s, because the 3 dB down point for the KEF Ref 1s is claimed to be 45 Hz.  Yesterday I inserted a passive fully balanced 80 Hz high-pass filter to shunt frequencies below 80 Hz to the subs and raised the low-pass to 80 Hz, both 24 dB/octave.  But I wonder if it might be preferable to have the 45-80 Hz range reproduced by the speakers rather than the subs.  How much music is in this range?

Advice sought.