I use two of these amplifiers to the speakers monobridge Gemini GX400 and I am very satisfied, I agree on the small drop in power when they have turned it for several hours, but we have problem is solved by setting PC fan directly on the back of the amp. The result is more than satisfactory and the amps are cold even after a whole evening, and there shall be more loss of power! Short story: one of our amp had a fall of more than 2m .... it works perfectly, I assure you it's rib, but was afraid