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.