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General Car Audio
Predicting pressure inaction pathways and acoustic coupling.
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<blockquote data-quote="Papermaker85" data-source="post: 8565431" data-attributes="member: 572595"><p>It occurred to me that my configuration is somewhat unique. Sub woofer firing forward happens to be peaking at 45hz. That's the easy part.</p><p></p><p>We find our 1/4 wave length to get our front a rear wave into phase at the dash where the car is peaking.</p><p></p><p>So in theory if we can developed somewhat of a pathway of lowest resistance we can in theory get the front and rear wave to couple at the dash giving tremendous gains in output.</p><p></p><p>So we know that our peak frequency is 45hz.</p><p></p><p>We know that the meter is on the dash.</p><p></p><p>We also know that the rear where is a hundred and eighty degrees out of phase so in order to get the rear and front wave in face the rear wave has to travel 2 times the distance from where the front wave develops to get it to couple but the rear wave.</p><p></p><p>So let's do the math.</p><p></p><p>Speed of sound in inches per second over frequency or hz aka cycles per second</p><p></p><p>13503.937/45=300 inches.</p><p></p><p>He of that is 150". So from said sorce the rear wave must travel 150s before it reaches the front wave.</p><p></p><p>The tricky part is creating a low resistance pathway that is the correct length.</p><p></p><p>the closer we can get it the louder we will be.</p><p></p><p>Now to the drawing board for 150s..</p></blockquote><p></p>
[QUOTE="Papermaker85, post: 8565431, member: 572595"] It occurred to me that my configuration is somewhat unique. Sub woofer firing forward happens to be peaking at 45hz. That's the easy part. We find our 1/4 wave length to get our front a rear wave into phase at the dash where the car is peaking. So in theory if we can developed somewhat of a pathway of lowest resistance we can in theory get the front and rear wave to couple at the dash giving tremendous gains in output. So we know that our peak frequency is 45hz. We know that the meter is on the dash. We also know that the rear where is a hundred and eighty degrees out of phase so in order to get the rear and front wave in face the rear wave has to travel 2 times the distance from where the front wave develops to get it to couple but the rear wave. So let's do the math. Speed of sound in inches per second over frequency or hz aka cycles per second 13503.937/45=300 inches. He of that is 150". So from said sorce the rear wave must travel 150s before it reaches the front wave. The tricky part is creating a low resistance pathway that is the correct length. the closer we can get it the louder we will be. Now to the drawing board for 150s.. [/QUOTE]
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Predicting pressure inaction pathways and acoustic coupling.
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