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Noise floor vs Noise floor when speaking

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Hello,

Is there any reason why my noise floor would differ while speaking vs when just recording the tone of the room?

My recorded noise floor seems to be lower when speaking; -85 and higher when I just sample the "tone" of the room, it's at -60. Is that because my voice is blocking most of the noise floor?

Sorry if this question seems basic, total newbie at this.

cable with lowest noise floor canare belden mogami?

i have a few cad e100s's on the way and if what i have seen is true it has a very low noise floor, 3 point something dba, and i wanna keep the "low noise" signal going, so does anybody have any opinions on which cable has the lowest noise floor?
i'll be running them very short, around 15 foot or less
any help thanks

noise floor

ok i know this is very basic question and i feel like an idiot for asking so dont chastise me any further.
i think i understand what noise floor is but could someone further explain this to me (yes i have searched it but to no avail) and how i can measure it in my studio.
is it basically just recording silence with all equipment on?
jesus i feel like an idiot.

noise floor is changing during recording

hello.
i was recording my synthesizer SY 85 into Apogee trak2 through coaxial digital cable using Sony Sound forge apps.
even though i didn't play SY 85, the noise floor level is changing
why did it happen?
the noise level was -69 dbfs, but suddenly it was changed to -79dbfs. then again it was -79dbfs