On Fri, 11 Jun 2004 10:53:28 -0400, "Doug Dotson"
wrote:
Fron what I understand, the higher frequency noise of the 3600
RPM gensets is easier to dampen than the lower frequency of the
1800 RPM units.

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That has not been my experience for what its worth. My last boat had
a 3600 RPM gas Kohler with a decent sound shield and water lift
muffler, shock mounted under the rear deck. Inside the cabin with the
A/C on, the noise level was barely noticeable. Outside in the cockpit
however I found it objectionable. Not really ear splitting or
anything, just annoying. It had kind of a frantic over reving quality
to it that I have not noticed in 1800 RPM units.