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

45 years ago, when I spent a lot of time in movie theaters, our Dolby techs would put a microphone half way back in the seats just to right of center and set center channel at 85dB, left & right at 83dB and the surrounds at 81dB (using pink noise).

I typically set volume to a level that I think approximates as if I were there, listening live.  So yes, depends greatly on genre and setting of the recording.  That often is on the loud side because of my rather large room (and my high school background in percussion).  

I too had Advents in 1975 & then a stacked pair. They were way better than their very reasonable price would suggest. They of course had excellent bass & pretty decent mids & highs if not the most open, extended & detailed in comparison to today’s good speakers. I had Lots of fun w/ them. 

I don't have a dB meter but I like to turn volume up so I can't hear my wife's complaints about it being too loud.

Pass x-250.8, Bricasti M1se with network card, specialty Tekton Encores,( all 175lbs each)  30'x60' 16' ceilings shop, dual SVS SB4000 subs (listening area 1/3 of that, speakers 12' apart 15' away, stream qobus via Audirvana  Rock and roll only, mid 80's to low 90's ( due to speakers efficiency, all done within class A of AMP) Metallica, Pink Floyd, Led Zeppelin, Lynyrd Skynyrd etc. 72 YOA, still with pretty good hearing!  Also Project RS2T with linear power supply.  YOU ARE THERE! closer than you think after a Buffalo Trace or 2. Robert  TN   A shout out to you all for your help and assistance over the years,  Thank you, and Audiogon forum

Depends on music, mood and environment (sleeping spouse, guests, etc.)