O.K after so many good suggestions on possible sources
and way to get rid of noise, I made a few measurements
today.
Highway 65 mph: 80 dBA (control as before)
hit the clutch, still doing 65 mpH: still 80 dBA!
Well it's not the engine noise, knew that already,
because that is only 73 dBA. But it's also not the
transmission.
Remove the driver side door panel: 82 dBA
The idea that wind noise / road noise comes through
the front vent openings in the door seems to make
sense.
Hitting a bad patch in the road, same speed: 85 dBA.
Hmm. I guess wind may not be the most important
source.
I'll wait for a windy day and do a measurement with
the wind and against.

Regardless, it seems to make sense to block the noise
from the door vents. Any suggestions? Just stuffing
them shut may not be a good idea. Doors get pretty wet
inside when it rains and I don't like rusted out
doors. Dynamatting the door doesn't help, if it's the
vent opening and not sound transmitted through the
sheet metal. Maybe it's better to work on the panels?

I still hope some of you guys would get a cheap sound
pressure meter and measure noise so we could compare.
BTW it is the only decent way to equalize your sound
system IMHO.

Reinhard, 83 Westy, "Moose"

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