Nothing major, just a slight upgrade.

You do realize that the empeg has line-level outputs, there is no amplifier built into it as there is in your current head unit, and that you will have to install a separate amplifier?

This qualifies as more than "...just a slight upgrade."

This is not an overwhelmilngly difficult project, but it may entail quite a bit more disassembly and wire-stringing than you were thinking you had to do, plus the acquisition of the amplifier.

You probably knew that stuff already and this is nothing new to you. I hope...

tanstaafl.