MacDon R85 Operator's Manual page 6

Noise Levels
The A-weighted sound pressure level inside the operator's station of a typical self-propelled vehicle (e.g., M205),
when operated in conjunction with this R85 rotary disc header, is 79 dBA. This measurement was taken in
accordance with ISO 5131. The sound pressure level depends upon the rotary disc speed, crop conditions, as well
the exact type of self-propelled vehicle used to power the R85.
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