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Subs -n- Ports Relationship
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<blockquote data-quote="Buck" data-source="post: 8865201" data-attributes="member: 591582"><p>Different sub and port placement can move pressure zones within the vehicle where the sub and port waves collide and create pressure peaks in relationship to how waves meet and collide while inside of the vehicle.</p><p></p><p>What matters most is the sub and port are in phase with each other, like sub and port exit into the exact same airspace. Sub and port location matter more for nuanced pressure directing, where a port tuned properly will phase properly with a sub, no matter where either one is. Certain types of boxes are more sensitive to woofer distance from port opening, but usually it's not a huge difference, especially in car audio where dimensions are so limited vs the 1/4 length of bass waves. Sub distance from port absolutely changes tuning, but it's complicated due to pressure changes outside vs inside of port, and would matter more in like a t-line or horn vs less so with ported, IMO.</p><p></p><p>It's all about properly phasing the pressure. Bass is omnidirectional, not angular like mids and highs become, so as long as everything is in phase, directions don't fundamentally matter (basically), but port and sub location does matter more when designing for different environments and cabins, where you move subs and ports to aim pressure zones, like to your ears or a SPL mic, so it does matter. It's hard to describe fundamentals vs reality, because everything you change matters somewhat.</p><p></p><p>It's all about phasing the pressure.</p></blockquote><p></p>
[QUOTE="Buck, post: 8865201, member: 591582"] Different sub and port placement can move pressure zones within the vehicle where the sub and port waves collide and create pressure peaks in relationship to how waves meet and collide while inside of the vehicle. What matters most is the sub and port are in phase with each other, like sub and port exit into the exact same airspace. Sub and port location matter more for nuanced pressure directing, where a port tuned properly will phase properly with a sub, no matter where either one is. Certain types of boxes are more sensitive to woofer distance from port opening, but usually it's not a huge difference, especially in car audio where dimensions are so limited vs the 1/4 length of bass waves. Sub distance from port absolutely changes tuning, but it's complicated due to pressure changes outside vs inside of port, and would matter more in like a t-line or horn vs less so with ported, IMO. It's all about properly phasing the pressure. Bass is omnidirectional, not angular like mids and highs become, so as long as everything is in phase, directions don't fundamentally matter (basically), but port and sub location does matter more when designing for different environments and cabins, where you move subs and ports to aim pressure zones, like to your ears or a SPL mic, so it does matter. It's hard to describe fundamentals vs reality, because everything you change matters somewhat. It's all about phasing the pressure. [/QUOTE]
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