i think the point has been lost..

if your running your channels on each track in teh red - no matter how low the master is - your overunning the channel - so you get less clarity or quality - or basically distortion.

so if you keep the channels at a decent crisp sounding level, eg 1st red at peak on the djm600 and run the master out just the same way - you'll have a decent sound, if you want it louder!!!!

turn up your amp - but again don't distort it, then add more amps and speakers to make the overall sound loud - but clear and crisp.

as dirtybass said overun = poor sound - period -

but i can't level that a&h to well eh.. one day!!!