X-Mozilla-Keys:                                                                                 
Archie wrote:

I would hate to hear a stright cut belt then. Must be painful at
1000 HP and 10,000 RPM :-). An active noise canceling head
set should have no problem with pure tones of this nature.

One trick we perform is to drill small evacuation holes in the
 dedendum of the sprocket. This relieves trapped air at rpm,
and reduces noise level.
Archie

 
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