I have a Niles CS12V current sending remote trigger. It senses when a receiver, preamp, etc. is powered on and provides a solid 12v trigger for your amp, etc.
It is very robust, fully shielded steel case and has an adjustable trigger delay.
Niles makes pro grade AV equipment & accessories for custom installations.
This a much better solution than a power sensing strip which sequences power and do not generate a trigger. Plus, they are designed for multiple plug in devices, not the best scenario for a power amp.
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