Audio Research Refernce 75se

It should be fairly quiet, especially from your listening position.  If you hear it from your listening chair (or further than a couple of feet away) it could be abnormal. 

A small amount of noise is normal but it shouldn't raise your noise floor noticeably.

The noise isn’t transferring to the speakers from what I heard.

cant hear it from where I sit. But 1-1.5 meter away I can.

It is NOT normal BUT…how do you know the buzz can be traced to the ref75se? Could be the pre, the power, the source, the turntable, the refigerator, the phono stage. Was the system fully balanced and wired with xlr cables? Were they using xlr to rca adapters at the ref75se? You dont have enough data yet.