What is the proper loudness for listening?

How about you all put away the SPL meters and turn the music volume up or down to the point you enjoy the listening experience.

If the level you enjoy listening at bothers someone else, put on earphones.

I made and setup my system to sound very good at low levels. About once a week my wife will spend a day with one of her friends, and that is the day I will turn it up a bit. Not deafening, but a fairly healthy volume. 

Those of you who constantly listen to levels 85 db and higher and have a spouse, either she's deaf, or doesn't care. Lol

Better ask to my wife, she will convince you that all you need is a 1 watts amp 

Take live piano as a reference from quiet to the loudest sound. This listening range is ideal.

"A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB. Noise above 70 dB over a prolonged period of time may start to damage your hearing. Loud noise above 120 dB can cause immediate harm to your ears." CDC

Assuming above is true, seems normal conversation 60 dB is minimum to hear into the music and maybe 70 dB is the safe recommended max.  Anything above that and you get into risk/reward, and risk tolerance is highly subjective.  I'm risk adverse and am very protective of my hearing from damaging sounds - excessive dB levels, not the sound of a nagging spouse :)