Markmcan

We have recently purchased a used Crown DSI4000 amp to connect JBL speakers for a cinema system. It has a two 3-pin detachable Phoenix-type connectors. Our amps are at one end of the theatre and our projector is at the other with a xlr snake between. Is it wise or is it okay to get an adaptor from xlr to the 3 pin phoenix connector?

I have several used JBL 4638 speakers and JBL 2446h horns (impedance 8 ohm) and am looking to buy some used amps to power them. This is for a small theatre for movies. Cost is a factor so prefer used amps and grow the system along the way. Can someone suggest what amps would be best to power these speakers. Planning on using 4 of each along with some small side mounted speakers around the room.