Even after all these years the TU-114 (an obviously the TU-95 Bear) were unique - In later years my office was in an Eastern Air hangar near the end of a runway. I could barely hear most aircraft powering up for takeoff but when Braniff started bringing the Concorde down, it certainly got my attention. However, it was a thunderous roar. The Russki beasts had a throbbing, pulsing sound (certainly from the props) that got into your very chest and guts.
I saw the unducted fan engine at the P&QW museum a couple of years back. One could see at a glance that it was a loser in the noise category.