Eximius seems to offer a program that takes a CD and applies some sort of DSP effect before saving it to a DVD in a compressed format (probably MP3). This seems like a waste of time if you are interested in improving the sound of CDs.

If you are open to the idea of ripping a CD on your computer to music files and then using the PC as a playback device, I highly recommend trying Foobar2000, which offers equalization, resampling (and bit-depth changes), and many interesting DSP effects. It is free, plays just about every music format known (I recommend FLAC), and is highly customizable.