What's up with lousy bass on classic rock recordings?


Few examples: ACDC Back In Black, Van Halen 1, Boston (1), WHO's Next, Def Leopard Pyromania. 

The low end is almost non-existent. Digital and vinyl. 

It's not my system, I listen to a lot of jazz, other classics like Janis Ian Breaking Silence - bass is rich, full, has slam when appropriate.

Compression? Or were the low frequencies never there? Pretty disappointing. 

macg19