It is not about the 'sub'. If your main speakers can get down to at least 25 hz, no need for sub. Otherwise, a sub is a must. Also, records in most cases needed to take out the bass as the cutting on the disk master was always a problem, groove width. Once cd's came on, and were in turn re mastered from the original tapes, it was very clear what had been dropped from the vinyl stuff. I've gone back on a number of records and compared the vintage cd, you will amazed what was dropped. All this being said, the integrating is still the biggest challenge to get it right.
