Mufflers

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Automotive mufflers aren't speakers of course, but they are acoustically tuned "boxes" nonetheless, so may be of some interest to diy speaker persons. Get a load of this one! I think it's from some small 2-stroke scooter, those kind of engines being notably noisy and therefore needing greater muffling because of the rapid opening of the exhaust port producing more of a "crack" sound rather than the more gradual initial exhaust flow of a 4-stroke.

Imagine if your next speaker box was this complex!
An externally hosted image should be here but it was not working when we last tested it.
 
A major design feature is acoustic resonators which hugely
improve the 2 stroke intake and scavenging action giving
a large increase of power in the "powerband".

Only after this is its other function, to "muffle".

🙂 sreten.
 
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