jrosser

Thats me sat with the laptop and microphone in front of Rick's door. For anyone stumbling across this in the future please only pay attention to the difference in sound level between the peak of the red line, and the blue line, inside the green box Rick has highlighted. You can certainly say that the door as installed allows 1.3kHz from the road noise outside the house to pass through with very little reduction in sound level for whatever reason. But you can't say much about if the door does or doesn't meet the 33db sound reduction specification at other frequencies. You'd measure that differently. I do agree with Rick that the sound appears to come through the middle of the whole door leaf rather than at the seals - I heard it myself, the video in the first post shows that very clearly.