Hmmm... from what papermaker says, ill take the AQ over the sundown every time.
Everyone strives to maintain 14 volts, doing big 3, running 0 guage, etc. so if the amp does 1200@14.4 volts, which is what everyone should have, then u get a true 1200 watts.
My aq does not even get the slightest warm, im not kidding, if u didnt hear the subs playing, u wouldnt know its on. Why would i pay more for the sundown to have the temps lower? if its already ice cold, its not going to die fast. Sure the sundown is cooler, but for what, heat isnt going to kill it if its already not even slightly warm.
now if i was looking for 1300 or whatever watts @1 ohm then the sundown would be an option, but again only if it was right for the money. if the sundown was $300 for 1300-1400 watts @1ohm, but i could get an aq 1500for same price, u can bet i would go aq.
but on to the mb quart, how does it do more power than the aq and sundown @1ohm and its cheaper? at 14.4 volts, clean power, no clipping to hurt speakers/subs, if it does not get any warmer than the aq amps, why wouldnt the mb be the best option then?