I don't know of any, but I'm also not sure you would really want it. Those headunits are so crammed with components, I don't think there's room to do a proper DAC stage. The Empeg's is probably as good as you'll get in a built in DAC circuit. Your best bet is to go with an external DAC and run it's analog outputs into an external amplifier. Zapco makes a converter, theDAII-SL, priced at about $700. It's design is a bit dated, but hopefully somebody will take care of that...

Stu