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

Ideal db depends on genre of music and size of room. In below live recording, avg db is mid 80 and bit loud to me. DB meter is about 7ft from speakers. Room is 22’L x 13.5’w x 8’h. Alex/Wavetouch

Faded - Allen Walker

It is system and person dependent (highly age dependent).

The better my system the lower the required volume has been to sound great, after I got past my 20’s.

so now 65 - 75 db.

Just recently got a DB meter app; I live in an apartment and I sit about 8 feet from my speakers which are about 8 feet apart. What I considered 'loud' turned out to be between 40 and 55 db! And I play rock music, not ambient! 

70dBC for music with peaks into the 90s for the more dynamic material I listen to.

For multimedia outside of music, 80dBC with peaks nearing 100s so I wear some specialised earplugs during movies @polkalover 

75dB on the Quad57s. 85dB on the Spendors and RELs.