First off.. I don't know of any powered mixers that have four amps in them. I know Carvin makes one with three amps.
Originally Posted by damonseed
Another issue is your ohm load. Speakers in parallel cut the ohm load. In other words, two eight ohm speakers in parallel would show a 4 ohm load.
I never recommend going below a four ohm load regardless of what the amplifier manufacturers say.. Don't ask me why, just old school.
Since you have two 8 ohm main speakers, you can easily daisy chain them together to create a 4 ohm load. That would take up one amp.
As to running four monitors, if you don't purchase another stereo amp to run them, one alternative is to run the speakers in "series". That requires building a box with the series connections made in it. You do not want to simply daisy chain your four monitors together, that could lead to burning up your amp. Better to maybe purchase the Carvin three amp PA system and use one amp for a pair of monitors, another amp for another pair of monitors and the third amp for the mains. I am not familiar enough with the Carvin unit to know if this would work, but I believe it would.
I have built a box that allows me to connect up to eight 8 ohm speakers to any amp and still show an 8 ohm load. I call it a Series/Parallel Box.
You are correct in saying you need four amps. Carvin also makes an amp with four amps built in that would work for you too.
WARNING! INCORRECT USING THIS FEATURES MAY CAUSE YOUR SYSTEM BROKEN!