Scousepasty, it's interesting that you mention the last part. A couple of years ago Sound Lab demonstrated a pair of 5-wide arrays of ProStat 922s, each array set up in a continuous arc at each side of the stage in the 21,000 seat LDS Conference Center main auditorium in Salt Lake City. Ultimately the arrays would be several units high, producing clear, coherent sound of uniform loudness no matter where you are seated. The mind boggles.
Dealer disclaimer.
Back on topic, I too find it odd that Maxxes would be blowing capacitors, especially with such amplification that I couldn't imagine would be clipping. Have the amps been passing or putting out some DC or other spurious signals on occasion? I would get them checked out before doing anything else.