I have started creating mix tapes of my ~300 LP collection. I listen to the tapes at the office and also play them around the house when I need background music. I am making the mix tapes on my 3-head JVC v662. I notice that good sounding LPs obviously create good sounding tapes. But many of my LP's do not sound good! I would say only 10-20% of my LPs have true audiophile sound. The rest are ok, but definitely lack highs and treble. This becomes more noticeable in the mix tape. So I guess my question is why do LP's have such huge variation in sound quality? I know there are a hundred variables that go into making a LP. What are the most common reasons only few sound audiophile grade? I know folks are going to question my LP setup or tape deck. I am fairly sure I have no issue there. The problem IMO is in the LP source.. I could have 100k turntable and top of the line Nakamchi and will still create crap sounding tapes from crap sounding LPs. For the record I have a Marantz TT-15s1 with Grado gold with 8mz stylus. My JVS cassette deck is calibrated and has no issues. I hear almost no difference when I switch between monitor and source during recording.