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  1. Hi everyone, I received a new Anthem MCA-20 power amp today. The power amp is aimed to take the load of my Studio 100s off my MRX-710 so it has an easier time doing the remaining 5 channels of my sound system. Being excited, I really wanted to have a serious listening session. So I unwrapped it, and started to connect it up. I turn it on, and a droning 50Hz hum started. There was no signal, but this hum was irritating to say the least. So then I put it onto my TV cabinet, and boy did it get worse. Now I don't put too much stock in specifications, but any benefit of having a low THD would be utterly eclipsed by the drone, even in my normal listening levels. Loud movies.. well that's an entirely different matter. The power-amp's chassis vibrates when on. I can feel it with my hand. Does anyone else have an MCA-20 (or 30/50). Do they have this audible drone? I'm trying to figure out if it's normal for this model, if I have a defective unit, or if there's some environmental factors at play. The only thing I can say for sure is that my MRX-710 is dead silent. Anyway, when listening to things at louder volumes, I must say that the power amp has really given life to studio 100s. They may be efficient, but there really is an advantage to "Head room!". Hope you're all having fun! Hamish.
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