I have early 50s jazz tracks and they sound fabulous and compared to some newer jazz recordings they sound even more fabulous. Old recordings can be very good but maybe sometimes the sizzle on the cymbals is a bit harsh but passable as per listening fatigue. I'm not sure if the mastering process boosted the highs or if the recording process did it.can't repeat this often enough but the sonic differences among my favorite jazz recordings from the 60s and 70s are significantly larger than the differences among my favorite audio chains, no need to worry about the last dB of SINAD, etc... YMMV.