I believe it all depends on what media the music was originally recorded on. If the music was originally recorded on 2" analogue multi-track tapes and then mixed down to 1/4" 2-channel analogue tapes, the dynamic range will suffer due to the high noise floor of magnetic tapes. If the mixed down was done directly on DAT via a DAT recorder, it should be able to capture to a high degree the original analogue recording with better dynamic range. Of course, it also depends on the quality of the ADC and DAC.