What is the sound level of Your Listening Room?

I built my room custom to ensure noise diminishment. With dehumidifier going outside the room and AC running, 23dB. When neither is running, 16dB. 

wolfie62,  power relates to the quality of the sound, not the relative listening level. It has no bearing on the issue of ambient noise in the listening environment. You could use a cheap 50wpc amp or an expensive 1,000wpc amp, and the environmental noise issue is unaffected, given that the amps are quiet. Power is irrelevant. 

Perhaps you could do a little test to learn about ambient noise masking the signal. Take your audio system outside. Play it while the neighbor is cutting grass with a lawn tractor. 

Is the lawn tractor masking the music? Ah, then you obviously need a 1,000wpc amp! That should fix it all, right? Obviously, power makes the ambient noise go away, right? Or, perhaps you were simplistic in your assessment.   :(

Having a quiet listening space allows for appreciation of nuances such as the difference between a noisier vintage tube amp and a newer, more absolutely quiet class D amp, such as I wrote up for Dagogo.com, the i.V4 Ultra from Legacy Audio. It would be a bit tougher to hear those distinctions outside with the neighbor's lawn tractor running. But, relatively easy to hear such distinctions in a quiet room. 

Please do not disdain what you do not understand!  :) 

barts, congrats on what will be an excellent environment! Kudos! You will LOVE the solitude! The music will be stunning in such a space. 

Yes, when I breath heavier, the meter jumps by a couple dB. 

fiesta75, yes, I was thinking the same thing. 7 is imo not attainable in a domestic environment. Recording studios are doing well to be under 20dB.  

mijostyn, Have you experienced what a room with reduced environmental noise does for the listening? Obviously, reducing source noise is advantageous, but irrelevant to this discussion. 

The genre of music played is absolutely associated with this topic. If you listen to music that has quiet or silent passages, guess what? You can hear environmental noise if your system doesn't intrude with its own noise. Those in normal domestic environments will have little appreciation of that variable.  

For instance, the start of Shelby Lynn's "Just A Little Lovin'" begins with a field of silence into which individual drum and cymbal strikes repeat. I assure you that a deeply depressed ambient noise field changes the musical perception radically. Any ambient noise, from an AC unit to an appliance motor running, etc. intrudes obnoxiously. At about 2:45 there is a pregnant pause as the instrumentation fades until almost silence. Again, if there is ambient noise of any degree in the room, it will sound like utter intrusion. Perhaps that is not your preference of genre of music, but simply because it is not important to you doesn't mean it's not an issue/consideration for other hobbyists.  :)