I would have agreed with you too until I worked out how far 600 or even 300m is and that in practice I don't hear anything from the high street at the top of our street. Give it a try, map out how far 300m is from your bedroom.
there are woods near my house and if you walk through them there is a river where people like to party on a summers night. The river is roughly 500+ metres from my house. On a still night, with the windows open, I can hear the people at the river. I live in a sixth floor flat, and sometimes I can't hear the people round the corner playing music unless I am on the landing. It all depends on the direction the sound is coming from.