Mine was great out of the box as yours seems to be. May have gotten a bit warmer after about 100 hours but did not need any burn in to sound great.
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I own a 352,the predecessor of the 402, and I beleive that when I bought mine I really think it was fully broke in after about 50 hours. McIntosh doesn't really address this anywhere that I can see, like some manufactures. But give it about 50 hours, crank it and love it. I hear from so many people that McIntosh is not as good as other brands and that may be so but I really don't think I will ever sell my Mc amps. I was going to upgrade to the 402 but since the 352 is ecentially the same I am adding the LED lighting from AudioClassics and plan to enjoys the music.
Enjoy your amp!
I had a well broken in 402, which I sold assuming my new ARC Ref 110 would render it obsolete. But while I do love the Ref 110, I did miss the 402. So I bought another one. So I have the experience of going from a broken in one to a brand new one. I can tell you, the new one was not at good initially... It was fine, but not as riveting as the old one. After about 100 hours now, it is a great amp, like the one I sold. I would say it needed at least 50 hours to really come on song, and I assume it will only get better. The way it improves is the cleanliness of the soundstage, image placement, and composure under pressure. It is not screechy or irritating when brand new, but it develops into quite an awesome amp. I have owned a lot of amps, and these 402's are fantastic, in every way. It is the most natural sounding solid state amp I have heard.
The McIntosh MC402 is an incredible power amp. Very well balanced and superbly true to the music. Owning several power amps the McIntosh MC402 I will never ever let this power amp go. Simply magic and coherently wonderful sounding. This amp does everything a power amp should do. The characteristics are neutral but yet definitive. Smooth on top and well extended on botton. Most natural midrange vocal you will ever hear in a solid state amp but without the distrotion of tubes to deal with.
Enjoy your break in period of possibly one of the best sounding power amps in the world.
Kudos to McIntosh for such a wonderful amp.