I've not heard 80's and 90's high end CD players, only the lower and mid level units. To my ears they all sound tinny, unsatisfying. Newer cheaper DVD players easily beat out 80's and 90's units, the difference in the internal DAC being the reason why. I really think many people that like the old CD players are going with build quality, not sound quality in determining their preference.
I am not an expert, but until a real one says something, I feel I should comment about this,As usual, things are not that simple: The architecture of the
DACs has been evolving, so not all 80's and 90's decks have the same dacs which in the end yield different results, which may or may not be distinguishable by the human ear. At the beginning, DACs where compared by parameters such as oversampling factors, type of digital filters, and basically were multibit models (e.g. 20 bit like the Denons of the late 80's and early 90's), until the 90's when Philips introduced
Bitstream or 1-bit DACs. Of that generation of cheaper players (the 1-bit dacs where cheaper), I've never heard any sounding very good, just decent (e.g., the Philips models). Of the multibit players, I kmow that the
Denon 1650-G had four (2 for each channel) dac chips AD1862 N-Z that were used also in Acccuphase models, for example, worth 40 $ each at the time. I produces, even compared to today's CDPs, a superb sound quality. So, I would say one must specify what models are under discussion. Good sounding models did not need to be very expensive, like the
Philips CD350 that had 2 x TDA1540P – SAA7030 DACS. This Philips DAC and the TDA 1541 are still consdered among the best chipset dacs ever made, e.g.,
http://www.lampizator.eu/LAMPIZATOR/TDA1541 corner/TDA1541.html .
Sometimes people get a cheap vintage CDP for cheap, sample it and disregard it as bad sounding, blaming the old dacs, but the reason could be aging electrolytic caps or some othe issue due to aging of, say , the analog stage.
So, my conclusion is that not all vintage DACs were the same, and sound the same, and some could even today sound better than some low-class, generic DAC chips. Lets always leave this possibility opened.