Audio signal sensing auto on/off switch

I want to power my sub with external amps (have Behringer and QSC on hand). Both do NOT have a 12V or "signal sensing auto on/off".

I can only find circuit boards from China or Israel, and both take weeks/months.

I would assume that there is some DIY kit or ready to use 'box' available here in the US that offers this basic function. But can't seem to find one.

kraftwerkturbo01-01-2023 3:28pm

kraftwerkturbo OP Details Discussions Posts This discussion Message User 362 posts 01-03-2023 at 07:16pm Copy Comment URL Report Comment Edit Delete Good idea (to use the existing 'load sensing' power strip to control a heavy duty power relay (assuming that the big amp will melt the strip/contacts).
kraftwerkturbo OP Details Discussions Posts This discussion Message User 362 posts 01-03-2023 at 12:32pm Copy Comment URL Report Comment Edit Delete I forgot that I had a 'fancy' power strip here (bought and forgot). Now looking at it, it has a 'main' and some 'controlled' outlets. When the 'main' draws power (turned on), the 'controlled' outlets are turned on as well. Works in the test setup (receiver is 'main', CD player, tuner, another receiver, Schiit Modi 3, etc) are 'controlled'. Will now try if the big phat 1500W power amp can be controlled (I assume it has a 'softstart' to not smoke that power strip right a way. On one receiver, I have a 12V trigger. Is that 12V linked to 'power on/off' of the receiver? How many mA can those 12V triggers typically produce (to directly control a relay)?
kraftwerkturbo OP Details Discussions Posts This discussion Message User 362 posts 01-04-2023 at 12:15am Copy Comment URL Report Comment Edit Delete Sure this box can use 12DV trigger, not just a digital input?