i just sold my Hafler 500 amp (class AB) - along with the Hafler 110 preamp - to be replaced with a QSC GX5 (class D) which makes for a total of 2 QSC amps in my HT. the GX5 is half the weight, half the height, has more power, runs very cool, is built like a tank, uses much less electricity and the sound is excellent.

the Hafler was 27 years old and running as new, but i thought it would be better to sell it before some parts would break down with no original replacement parts available, or high repair charges.