Looks like you can run all four speakers on the Crown, as it is rated for 2-ohm operation. However, if you’re currently running four 200 watt plate amps, you aren’t going to gain much in the way of power with the Crown. It’s rated for 550 watts per channel @ 2 ohms, but that will be divided between the two speakers each channel will be driving. So, you’ll end up with 225 watts to each speaker.
Regards,
Wayne
