I don't know much about Honda's, but typically, there's a bundle of wires with a proprietary connector into the back of the head unit coming from the changer that has controls (HU ->Changer) and sound (Changer -> HU). The audio wires (4, or 3 if they share a ground) should be either 1 or 4 Volts, meaning you can wire the Empeg between the Changer and head unit with minimal hacking. You just need to know the wiring scheme. Any installer worth his weight in cable ties should have a diagram, or you can get the technical manual for your Accord. Read the many posts about wiring a changer/Empeg/head unit combination for more details.
If you're lucky (again, I know nothing about Hondas' stereos), the head unit has RCA inputs from the changer, but I doubt it.
Jason

_~= Dearing =~_
"WAY too happy about having #99."