Acoustics on the Road: Phase Cancellation and Your Car Muffler

Two things most people don’t care to understand: physics and how the heck your car works. But you’re different. Why, you probably already know that phase cancellation occurs when a sound source is delayed slightly (by a real-world reflection, or in recording and mixing), so that two coherent waveforms of opposite phase are superimposes and cancel each other out. (Er, in plain english: one wave’s crests cancel out the other’s troughs and vice versa.) Now, did you know this principle is what keeps your car’s exhaust from making a racket? How Mufflers Work [Howstuffworks] Basically, the muffler is a chamber …

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