Andrew - Thanks for the quick reply.

My pre-amp is a Integra DTC-9.8 and it uses 1/8 jacks for the triggers..

One more thing is that when I daisy chain my subs together the last sub in the chain has a green LED and the one connected to the preamp has a RED one, this state is the same no matter if the cable in plugged into the amp or not. I'm going to measure the Voltage from the pre-amp to rule it out tonight.