mustafagander,
I would guess the noise levels without the suppressors would be similar to a VC10. The BOAC 707-436s, like the VC10s, had Rolls-Royce Conways fitted.
I suspect there would be a difference in 'tone' though as the loudspeakers weren't clustered together.
Last edited by ZOOKER; 20th Jan 2015 at 09:45.