Greetings!

A recommendation: hook it up through the empeg first, see if you can quantify the noise introduced. You might find that it is very small, or if it is enough to warrant a switch.

I don't know if the voltage differences (empeg input 1V, output 4V) will cause you any problems. If you use a switch, both inputs from to the switch should be the same approximate level. I don't know if the CD you are looking at is adjustable, or what voltage it uses, but if your amp(s) expect 4V from the empeg, you may wind up with a quiet signal if your CD isn't 4V as well. Likewise, if your CD is 4V, running it through the empeg may give you a very loud signal...

Disclaimer: I am a very basic beginner, so I don't know how practical this is for a competition level vehicle.

Paul G.
SN# 090000587 (40GB Green)