Why I don't hear bass drums on Jazz LPs?

I don't hear the bass drums during playback of a number of jazz LPs (Webster, Hawkins, Ellington, etc). I have Thiel 3.6 speakers powdered by Mark Levinson 23.5 amp. I can isolate the sound of bass drums on rock/pop LPs but not on jazz LPs unless drummer play solo in the middle parts.

I read somewhere this has to do with size of the bass drums used in 40s, 50s and another explanation was the way drummer play bass drums. I can clearly isolate the double bass, snare drums, and cymbals on jazz LPs, but hardly the bass drum. Let me know your experience with this issue.