What is the sound level of Your Listening Room?


I am curious about what the sound level is at your listening position with your system turned off. I have checked mine and during the day it is about 43 dB and at 1:00 a.m. it can be as low as 28. I can improve the daytime level to 35 dB by turning off the refrigerators and air conditioner. What have you done to improve the sound level of your room?

I am considering adding a listening room to the back of my garage (wife is on board because she needs more storage space) and if you have made improvements that have reduced your ambient noise, please share them.
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I was going to build a $100k+ music room but abandoned the idea. It's quieter in the basement. 
Witty reply: Gimme two Siri(s) and I'll let you know how out of phase I can get them... 
If you believe the science, the average background noise level in an urban setting is +/- 25 db.  Even standing in your listening room when you can't hear a thing.  Two reasons.  1) there is background noise below, or above our hearing threshold.  2) Our brains have learned to tune out a lot of the usual background noise as it has learned there is no significance to it.  
The sound level or my room is very low due to insulating and blocking off the window and because the room had acoustic tile ceiling and wallboard put up at some point in time so i got lucky with the room, no standing waves or bass peaks and dips.