My NYC apartment is on 3rd Avenue, so it depends on whether there is a bus idling 11 floors below. If, not, I am around NC-30 (TEF25). OTOH, at the CT house, I run below NC-20!I live in NYC (East Harlem) next to a 24hr car wash so my ambient noise can be really high. But in the absence of someone going through the car wash with subs ablazing it is 54dB with no A/C and 61dB with.
How about you?