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Car Audio Equipment
Subwoofers
Why place the enclosure facing backwards ?
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<blockquote data-quote="T3mpest" data-source="post: 8268837" data-attributes="member: 560148"><p>The key is that your actually increasing delay, but it's all the same delay.. Subwoofer waves are very long, 40 feet in some cases, as you approach 20hz or so.. A soundwave will bend around any object that is smaller than the wavelength. This is why bass carries so well, it's longer wavelengths allow it to bend around most obects. This also means when you fire a subwoofer, the waves go not only the way you'd expect, but they also bend backwards behind the enclosure. If you face your woofer into your cabin and close to you, then the waves are also bending behind, travelling to the back of the car and then finally going forwards again once they have no choice. This makes that part of the soundwave very delayed vs the inital wave that was "aimed" at you.. Beacuse of this you'll get a null in your upper bass where the wavelengths are shorter. By placing the sub facing rear and very close to the back of the car, the waves that are aimed at the back and reflect off aren't that far out of phase vs the wave that bends behind and immediately go forward, it's only off by depth of your box, more or less, that pushes the null up much higher in frequency.</p><p></p><p>If that doesn't make sense, look at your avatar. imagine the blue wave facing the other direction, that is the wave that isn't reflecting off the trunk and heading towards you.. If you want the red wave that goes the wrong direction to stay in phase with that, it needs to hit a barrier and start heading the right direction, as fast as possible.</p></blockquote><p></p>
[QUOTE="T3mpest, post: 8268837, member: 560148"] The key is that your actually increasing delay, but it's all the same delay.. Subwoofer waves are very long, 40 feet in some cases, as you approach 20hz or so.. A soundwave will bend around any object that is smaller than the wavelength. This is why bass carries so well, it's longer wavelengths allow it to bend around most obects. This also means when you fire a subwoofer, the waves go not only the way you'd expect, but they also bend backwards behind the enclosure. If you face your woofer into your cabin and close to you, then the waves are also bending behind, travelling to the back of the car and then finally going forwards again once they have no choice. This makes that part of the soundwave very delayed vs the inital wave that was "aimed" at you.. Beacuse of this you'll get a null in your upper bass where the wavelengths are shorter. By placing the sub facing rear and very close to the back of the car, the waves that are aimed at the back and reflect off aren't that far out of phase vs the wave that bends behind and immediately go forward, it's only off by depth of your box, more or less, that pushes the null up much higher in frequency. If that doesn't make sense, look at your avatar. imagine the blue wave facing the other direction, that is the wave that isn't reflecting off the trunk and heading towards you.. If you want the red wave that goes the wrong direction to stay in phase with that, it needs to hit a barrier and start heading the right direction, as fast as possible. [/QUOTE]
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Why place the enclosure facing backwards ?
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