Can I Have More Than One Amplified Zone with my 600 Series Head Unit?

Yes, but you need a high level to low level adapter. We recommend using the Fusion HL-02 for this. This allows you to connect a pair of speaker output wires from the head unit to the HL-02 input wires, with the voltage then reduced to match the line input level of an amplifier. The RCA connector output can then be connected to RCA cables and run to the amplifier.