Amp Receivers Weatherproof, But Not Much More Speaker Outputs From One Amp/receiver To Rca Inputs To Trigger Another Amp To Turn On. Is It Possible? How?

Speaker outputs from one amp/receiver to rca inputs to trigger another amp to turn on. Is it possible? How? - amp receivers weatherproof, but not much more

I try to activate a second amp with the rest of the house of power, but my old receiver / amplifier has RCA outputs to shoot. I have speaker outputs further, though. Can I have an RCA converter of a type of work? I saw the car-audio converter. Done the same for the amplifier of the apartment?