For a $500 budget, a DAC will do much more for you than trying to get another CD player.
For used, $500 will get you many things, including a Bel Canto DAC-1. I am sure others will have DAC recommendations also. I think a used "Full Nelson" MSB Link DAC is in that range, and a Gold Link DAC.
For used, $500 will get you many things, including a Bel Canto DAC-1. I am sure others will have DAC recommendations also. I think a used "Full Nelson" MSB Link DAC is in that range, and a Gold Link DAC.