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<blockquote data-quote="jujumantb" data-source="post: 1860824" data-attributes="member: 555241">Reversing the polarity means that the sub will be on its &#039;out stroke&#039; when it used to be on its &#039;in stroke&#039;.&nbsp; Of course, since the sub is moving back and forth anywhere from 20 to 100+ times per second, you wont be able to see the difference, but you may hear one.&nbsp; Basically, all the soundwaves in your car interact, this is most evident at crossover frequencies where multiple drivers are playing the same frequency (aka around 70-150hz where the sub and midbass are both playing).Say your subs were&nbsp; lowpassed at 80hz and your midbass highpassed at 80hz,&nbsp; then you play an ~80hz tone.&nbsp; Since the sub and midbass are both playing this tone, the soundwaves will interact dramatically.&nbsp; Ideally, you want the two waves to be in total sinc with eachother when they reach your ears.&nbsp; If they are not in sync, they can effectively cancel eachother out and that 80hz tone will sound VERY quiet.&nbsp; (You can dublicate this effect by playing a tone on a CD shelf system with movable speakers.&nbsp; When you move one speaker closer to you, you will notice the tone gets quieter at certain intervals. This is cancellation.)If, in fact, the two waves are out of phase when they reach your ears, by reversing the polarity on the sub, you can now make those waves in phase when they reach your ears and everything will sound much better.&nbsp; Since its hard to know whether your subs and mids are in phase with eachother, its a good practice to go ahead and try reversing the phase to see if it sounds better.&nbsp; It may sound better, worse, or really no difference at all.</blockquote>

[QUOTE="jujumantb, post: 1860824, member: 555241"] Reversing the polarity means that the sub will be on its 'out stroke' when it used to be on its 'in stroke'. Of course, since the sub is moving back and forth anywhere from 20 to 100+ times per second, you wont be able to see the difference, but you may hear one. Basically, all the soundwaves in your car interact, this is most evident at crossover frequencies where multiple drivers are playing the same frequency (aka around 70-150hz where the sub and midbass are both playing). Say your subs were lowpassed at 80hz and your midbass highpassed at 80hz, then you play an ~80hz tone. Since the sub and midbass are both playing this tone, the soundwaves will interact dramatically. Ideally, you want the two waves to be in total sinc with eachother when they reach your ears. If they are not in sync, they can effectively cancel eachother out and that 80hz tone will sound VERY quiet. (You can dublicate this effect by playing a tone on a CD shelf system with movable speakers. When you move one speaker closer to you, you will notice the tone gets quieter at certain intervals. This is cancellation.) If, in fact, the two waves are out of phase when they reach your ears, by reversing the polarity on the sub, you can now make those waves in phase when they reach your ears and everything will sound much better. Since its hard to know whether your subs and mids are in phase with eachother, its a good practice to go ahead and try reversing the phase to see if it sounds better. It may sound better, worse, or really no difference at all. [/QUOTE]

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