ok first, if an abm head (the 900) runs 575 watts @4 ohms, what does it run @ 8ohms? is it less than 300 or no? also does anyone here use ashdown cabinets? how do they sound, what are they conparable too? im looking for something that has mean sounding low end, with very pronounced mids and crisp articulate highs (i shoudl be a salesmen at GC). thanks for the help.