Ford Airlane - Sorry for the third post but I can't edit from here.
On a 747-400 takeoff EPNL is about 99.8 dB @ 875,000 on approach flap 30 it is 103.8 at 652,00 and 102.1 flap 25. 747-200s at 630,00 are 105.9. Concorde on takeoff is about 120 dB if that helps.