Was the microphone for the VC10 50 miles away? On takeoff at BZZ, it was incredibly noisy. I have no numbers, but the 4x Conways were anything but quiet. Quiet inside, with the rear-mounted engines, like DC-9s and derivatives, but insanely noisy as it took to the air.Here are some figures from DIO:
C130 EGR Noise Assessment Technical Report
Figure 5.7 is a reasonable view - A400M is ~20% noisier than C-130.
View attachment 478577
What surprised me was that VC-10 was quieter in almost all respects.
Disclaimer: the report was produced by AMEC on behalf of DIO. I don't know if the figures have been re-assessed or validated since the introduction of A400M into service.
Edited to add, looks like the above chart came from this document:
Figure 5.3 shows the takeoff noise levels. VC10 was indeed insanely noisy.