I have double pane windows, but the music room is on the corner of the house so it has two large windows facing the front and side. I know from going outside with my stereo on that the guitars could be easily heard at least a few houses away. Two houses down the street, there are a couple retired school teachers. When their son was growing up, he played drums. Every time they'd leave, including for 2-3 months at a time going to Florida after they retired, he'd be down there playing and you could hear it clearly from 4-5 houses away. I'm sure none of this was as audible though, as when I was in college. Some of my buddies would be playing flag football right next to our dorm, and if I started playing they'd send someone up to my room (2nd floor) to set my Twin Reverb on my desk, facing out the window. Then they'd yell out requests. One of my fellow basketball players had the hots for a couple girls and every time they'd walk by while I was playing, he'd have me play "Wang Dang Sweet Poontang" and he would sing it to them as they went by. For those who were wondering... Winger wasn't a thing yet at that time.