What is Your Signal to Room Noise?

[Hugo9000]

My listening room is very quiet, around 25 dBA during the daytime, slightly lower at night.  I live in the country.  I listen almost exclusively to classical music.  I generally listen so that musical peaks reach around 85 dB.  When I listen to popular music (Mariah Carey or Chris Isaak or Ella Fitzgerald or Patti Page), I keep it below 75 dB.