Mine's loud too. No worries. The diaphragm in the hatch went bad a few months ago. I've replaced it and the new one's as loud as the original. BTW - the new diaphragm looks almost exactly the same as the original. The only difference is in where it was manufactured. The new one's made in Germany, while the original was manufactured on the west side of the wall.

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Dave
1995 C280
1999 Triumph Daytona 955I - my speed fix.
1982 300TD - Gone, but not forgotten.