Power supply "improvements"for CDP/DVD player

I'm using the Lexicon RT-20 and have been impressed with the improvement in sound by using increased digital isolation, AC power conditioning and upgraded power cords(top MIT).
However, I would also like to make improvements to the internal power supply and find out what the machine can really do.
P.S.There is a subtle but obvious improvement just turning off the display and I feel there is still room for improvement.
Any suggestions?