I'm looking to buy a good rig, like a 4X10 with a 1X15, looking at ashdown ABM's, or possible Mesa/Boogie powerhouse setup. my question is if say the mesas, if th 4X10 is 600 watts, and the 1X15 isanother 400? what head do i buy to power it? and ive read the 4/8 ohm FAQ but still dont understand what would matter. Would one head power both the 15 and the 4 10's? Pleas ehelp im desperately lost. -Brian Schmitt AIM: SchmittUML if snyone can explain it in a conversation. Thank you.