JTUK and Spacey may be onto something here - maybe it's the influence of dance music, which seems to be in a cock-waving competition about how low it can all go. Mega sub-bass may sound impressive on kick drums (if you like that kind if thing), but for a pitched instrument ?
I dunno - I'm not a sound engineer, but as has been said on other threads, the treatment of the bottom end for live events does IMHO sound awful to what it used to.
But then I'm getting to be an old gimmer, so it was all better in the past wasn't it ?