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THE HOME VERSUS THE CAR ear and its components, but that’s to ignore the likely evolutionary reason for developing this way in the first place — possible reasons are that these are the frequencies that are emitted by predators who want to eat/kill us (both now and in caveman times), leaves rustling, that sort of thing. Baby cries have been posited as another important sound in that range. The human ear can localise sounds more accurately as frequency increases. The higher frequencies have a shorter wavelength (so there are more waves per second), giving more information to the brain about where the sound originated from via reflections. Once you’re down to 1kHz and lower, your ability to localise decreases to the point of zero. Indeed using the formula: frequency = speed of sound divided by wavelength 46

and adapting that to wavelength = speed of sound divided by frequency then with 343 metres per second as the speed of sound, the wavelength of a sound at 1000Hz come out at 0.343 metres, a little over 34 centimetres. Now your noggin is about that wide, right? So any sound that hits either of your ears under that

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Australian INCAR magazine  

12V tests, tips & techniques: three stunning custom car installs + the EISA Incar Awards

Australian INCAR magazine  

12V tests, tips & techniques: three stunning custom car installs + the EISA Incar Awards

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