I can vouch for the loudness of Hotpoint dryers!
My grandma had a liberator (like the 1701 shown above, but earlier - it didn't have the traditional hotpoint script but simply showed 'HOTPOINT LIBERATOR DRYER').
The roar it used to make when at work was quite considerable, as was its replacement in the early 1990's by a 4 digit 93** series machine, which wasn't any quieter.
Downstairs at the mo we have a Hotpoint TDL52 from the previous series of machines, as well as a Servis dryer. Even today, the noise made by the Hotpoint is quite considerable. I would say that the Servis makes prbably a third less noise (unscientific guess).
Still , the old Hotties made for an atmospehere.
As you say Jon, why should the washers take all the noise glory - bring on a Hotpoint Liberator/Liberatoresque dryer and you will have a pretty even competition!
Cheers
Paul