The Alpine CD Receiver is quite likely to have two pairs of preouts - one for the front and one for the rear. Also, depending on the model, you may be able to disable the Alpine's internal amplifier (if it has one), in order to have cleaner sound come from the preouts (or so they say).
I would simply connect the front pair of preouts from the Alpine into the AUX in pair of the empeg. I am using the same method to run my empeg through my Kenwood headunit, since I don't currently have an external amplifier.