Quoting Removed, click Modern View to seeI have read about electronic mufflers in the experimental stage at least, but know of no production. Even with a perfect muffler, the single cylinder engines still would not be real quiet, as the fins around the cylinders & all attached parts are vibrating like a speaker cone & sending out a lot of sound pressure waves. I remember the big change from air cooled to water jacketed engines in Porsche, Harley & others & the fin/other vibrations were found to be the source of much of the noise. My Miller 2E was/is stupid noisy, so I added a Corolla muffler ahead of the Miller/Tecumseh muffler & yes the exhaust noise went down, but all that 'other' noise is still terrible. A lot of shaking going on.
On the main topic here, concerning adding sources........it is far more complex that adding the dB ratings. Phase, reflections, distance between machines vs frequency (complex of frequencies), distance from each to observer, and on & on. Interesting discussion , but not many absolutes other than maybe decibel = 10log2 = 3dB. Then complicate that with the complex human who does not perceive that doubling of power as twice as loud. What is the meaning of life. :roll:
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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