What is the proper loudness for listening?

@snilf,

Frequencies below 500Hz are felt as well as heard, see Bone Conduction.😎 Article

Mike

Things sound better than louder they are. Just below the point where it gets uncomfortable and where are you notice distortion. 

Treat yourself every once in a while. But overall keep it around 75 because it does damage hearing over Time.

Oh and get rid of the reverberations in the room.

 

Oh and get rid of the reverberations in the room.

                              Couldn't agree more!

                 Room treatment = absolute necessity

I typically listen at 75-80 dBSPL C weighted. 

@chester_bunger re your question about Android SLM app, I believe they are problematic without calibration.  Unlike iPhones, which all use the same mic calibration, android phones do not adhere to a standardized mic sensitivity spec. 

I use Decibel X Pro on a Samsung Galaxy S9+, and using a calibrated Sound Level Meter I found I needed to introduce almost 15 dB of calibration offset to get an accurate SPL reading! Fortunately this app allows for calibration...not all do.

If this is not an option, even a relatively inexpensive Sound Level Meter is a useful tool to have for someone interested in audio.  I would recommend one with both A and C weighting, and Fast and Slow response.  They are available on Amazon for under $40.  While not lab grade, they would be much better than an uncalibrated Android app.

For me it is just before the pass labs needle begins to move unless I've got a snoot full and the woman is away. Peace and Nirvana through music!