I had no hum or similar on the unit. Hab get connected the device immediately. and complicated is there is not really much, so I also do not understand the bad reviews just because the people are too stupid to operate the amplifier. But it is a guide as folks! I have to evaluate with an asterisk, since he now simply is no more sound of itself him unfortunately. And as I read here so far, I guess, I've caught a Monday device or the like. would still buy it again, because it has so far is working properly.