Help! Is my new McIntosh MA12000 broken?

He did said he got his money back but was a pain in the ass. That was a couple posts up and it’s removed for some reason. 

To the op @hifilover87 did you get your problem solved?

Sounds like a pain but at least the eventual outcome was good. 
 

to those talking DC on the AC lines. Curious…. Can that be measured with a meter or need something like a scope? 

unit should be dead silent, return it for inspection and don't accept any BS excuses.

+1, “Contact your retailer and have them take care of the problem for you”. 

This might be better than my previous suggestion of using a DC Blocker. Your Retailer should know the best way to handle this. Please keep us posted.

I had significant transformer hum from my small tube amp when I moved to a new residence years ago. Purchased the Emotiva CMX-2, which completely addressed the issue. Worth a try. 

+1, install a DC Blocker to see if that stops the hum. And, if not, Return the amp to your retailer ASAP. Please keep us posted. For example, please this link:

DC BLOCKER

Or, maybe try a less expensive DC Blocker from your local hardware store. 

Not an expert on this, but if the sound is coming from the amp itself I think it means you have some DC on your AC power line and it is making your transformers hum. Look into a DC blocker, I think there are several options out there. ( e.g. HumDinger)

Mine is 100% quiet.

I did not have a good experience with Macintosh service when the DAC went out. The factory response was really pitiful. I finally had the DAC module replaced by my dealer.

No, it should not make a loud humming noise. Contact your dealer and have them take care of the problem for you.