The old pioneer car radios solved this problem by supplying the battery power to the radio from the amp. When the radio turned on, it began to draw more power from the amp supply lead and this would turn the amp on. It was a simple circuit in the amp that only used one or two transistors. You may need to build this circuit or find a manufacturer of a similiar circuit. In the short run, you can use a small toggle switch to supply the trigger voltage (+12 volts) to the trigger wire connection on the amp. Good luck.
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