In the 80's the Marine Patrol would station a boat in the Weirs Channel near the southern end of the no wake zone. They had a second boat with a decibel meter set up about 1/2 mile south in Paugus Bay. That boat would set out a couple of floats about 30 feet apart.
When the Marine Patrol Officer in the Channel found a boat that he felt might be too loud he directed them to go through the markers at cruising speed while their sound output was measured.
I had a friend who tried to quiet his boat down to the point that after adding baffles he hung truck mud flap off of the swim platform down to the water. The boat was still too loud and he had to take it off of the lake.
To their credit, the Marine Patrol allowed him several "free passes" after he did all the work on it to see if it was quiet enough.
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