Amp Power Source

Now the trigger wire is not powered until the radio itself is turned on, so there's its switched source, so I'm going to leave it be. No radio power, no trigger power. All I am wanting to do is put the amp on a switched source. Ok, one more stupid question. Do you think if I do add a relay that I can put both amps on the same relay and circuit? Thank you drive through.
Yes you can put both on one relay, just make sure it's designed for continuous use and that it's capable of handling the current draw. See what size fuse is in the amps and get one that will handle twice the current (because you have 2 amplifiers).