I'm curious. What is your "normal" listening volume?

pinwa, you hit exactly on what I have noted.

Bought an meter off of amazon and was amazed at ambient noise levels very similar to what you noted.

No measuring devices involved, but my listening volume is usually fairly low if other family members are nearby.  If left on my own, it often depends on the song, but I'll play it loud enough that you'd have to raise your voice a bit to have much of a conversation, but rarely ever push things hard....at least not for very long.   

65-85 dbs.

Average dB readings, some peaks may be higher

Early morning before wife gets up 50-55 dBC

Normal listening ~70-75 dBC

Very infrequently when I try to revisit my youth 80 dBC