Alto Trouper using all Channels

Hi good day! I have an Alto Trouper speaker, which I am planning to use the 3rd channel (rca/trs) input as a mic by using a rca to xlr cable or trs to xlr cable. Is it safe and possible to use all 3 channels altogether? Which is also better, rca to xlr or trs to xlr?

Thanks,

Van
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