My 500 gets so f-ing hot I can't even touch it after a long show- it needs cool down time before going in the bag. And I agree the ad 500 is one of the better sounding ad's out there. Its that 18bits- no dither- which is what i think sounds bad in other lesser quality ad's. It seems like everything is 24bit ad's- even low grade 30$ wall mart special cd players, sound cards, dvd players, yet everything is dithered down- just keep it at 16. Just my 2 cents.