What decibel level do you listen at? What is ideal?

For a free and immediately useful sound level meter please consider downloading one to your smartphone from the National Institute of Occupational Safety and Health. 

Simply go to your phone's App Store and search for:  sound level meter. There might be a number of options, but the NIOSH app is simple and can be trusted. 

Is this as good as a calibrated studio level device? No. But it's good enough to get a useable level reading to set a baseline or observation. 

When the wife is at home, 60-70. When she is gone, +80 🤣

I have no idea what decibel level I listen to music at. I simply adjust the volume to be suitable to how I feel at that moment and what genre of music I am listening to at the time.

65-70

I sit 8 ft from the Canton 9k reference stand mounted and SVS subs , my Listening db from 8 ft is in the lower 70ies with max. touching 80 db. If I go louder my ears will bleed. Full length Curtains behind gear, and in front on wall behind sitting position glass enclose large painting 3'x4' ish.Wall to wall carpet vaulted ceiling slopeing  low 8 to 16 feet high.