Sounds strange. After maybe a hundred flights on MD
-80 (mostly MD
-83 and MD
-87 - never MD
-88) and MD
-90 I cannot recognize a Hoover sound.
On the other hand it is my experience that the MD
-80/-90 is the quietest plane of them all, at least as long as you sit in the forward half of the cabin.
Sitting in between the engines, however, makes you count every minute until landing and makes you wonder why the hell you chose an MD
operator to serve you. But that's no Hoover sound, it's a plain old P&W sound. Anyway not nearly as aggressive as its ancestor the DC-9.