Hmmm... The head unit's site seems to say it uses an ISO out adapter. It might be that it uses the same position in the ISO adapter that the empeg uses (pin 5 in the wiring diagram). Still looking...

Edit: Aha! Over on their support FAQ page, they answer about connecting the amp remote out line with:

Quote:
Where can I connect the remote wire of my amplifier?
If you are using an after market radio you would connect the remote of the amplifier to the remote wire of the radio labeled; (remote, amp turnon or pwr. ant) on most radios a blue wire or on others a blue with a white tracer. If you are interfacing the amplifier with a factory (OEM) radio you will connect the remote terminal to an accessory wire that powers up only when the key is in the on position.