Once again I really wish more could come and hear for themselves. It would be so much easier than having to explain over and over again how off base so many of these questions are.
Whatever it is you are calling the noise floor, if you think having it be dead quiet to the point you can't hear anything even with your ear up to a driver, mine ain't that. At a good listening level you can clearly hear the noise floor from the listening chair. Then the needle drops and the groove noise is even louder. So loud you forget all about the noise floor. Groove noise is the new noise floor.
Then the music starts and within a few minutes you are wondering what in the world you were thinking. The music seems to come from an absolute black background, so that when someone stops singing you hear the ambient echo reverb to infinity. Many times you can hear this even without the music stopping. A singer or instrument will light up the venue, and you will hear this same ambient signature.
This is because the noise level is a MacGuffin, a red herring, a canard. At least it is the way you are thinking of it, which is not it at all. The noise level is not all this obvious hiss and whatnot. The noise level is ringing, resonance, distortion, all interwoven into the signal.
Better components, better wire, better vibration control, better field control, all these things together lower the noise floor. But not the weak concept of the noise floor as obvious hiss, A/C, traffic and stuff, but the strong meaningful noise floor of sounds that stop and start instantaneously as they should.
Clean up your system with an everything matters approach, you will be surprised how much better the noise floor will sound even without doing a single thing to the room. Not because this other stuff doesn't matter. But because it matters a whole lot less than you think.
