I'd like to use my compressor/limiter to protect my PA speakers from hard volume spikes. Also, my power amp is rated higher than my speakers too (more than 2X the power). I understand how to use it as channel inserts, but I don't have enough compressors for all the channels being used. I am using an Allen Heath mix wizard 3 board. I thought about putting the compressor on the main outs, just before the power amp. Is this not a good idea, to put the compressor on the entire mix? I'm thinking of maybe a brickwall setting for the mains, and still use a different compressor for a few channel inserts to smooth vocals out. I currently have a dbx 2 channel and a behringer autocom 2 channel.