I did this and please check my build thread. Actually there are Amps which can accept speaker level out signals so you may not need to add a line level converter. But I did add a Audison bit ten which act as a line level converter as well as a signal processor, it also wakes up by sensing audio signals coming out from RNS 510 so you don't have to worry about a remote wake up line from RNS 510.( RNS 510 do not have this remote wake up line). Audison bit ten will generate a remote wake up line for the Amp.
When you get a line out converter be careful to find one with the ability to produce this remote wake up signal for the Amp.
Adding a external amp properly with signal sensing wake up / or remote wire with line out converter will not affect the audible warnings because audio system will power up as soon as RNS 510 out put any audio signal. Everything should work as before.
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