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<blockquote data-quote="Doxquzme" data-source="post: 8924444" data-attributes="member: 689267">Okay, but what is the gross volume of the box itself, before the woofer and before the port displacement is accounted for?Did someone indicate that 37Hz is the tuning frequency?Without knowing the gross/net volume specifications, there is no way to calculate the tuning frequency based simply on the port displacement; all three specifications are interdependent.What are the outer dimensions of the box, what thickness is the material used to construct it, and what is the length of the port?Don&#039;t get too hung up on the port area since this is a temporary situation. Port area in correct proportion to the box volume is done to mitigate noisy ports, not whether they are tuned correctly.Yes, port area and the length in a given size box determine the tuning frequency, but the size of the opening and the general applied rule of thumb for that size is strictly for preventing chuffing, wind noise, and turbulence.As for the port and the driver exiting from the same size, it&#039;s not always possible, but the benefit is that the port, which is essentially an extension of the back wave of the driver, leaves the back of the driver, exits the port at about the same time, in sync with the front wave of the driver and combine to netting you that 3db extension of the bass output.</blockquote>

[QUOTE="Doxquzme, post: 8924444, member: 689267"] Okay, but what is the gross volume of the box itself, before the woofer and before the port displacement is accounted for? Did someone indicate that 37Hz is the tuning frequency? Without knowing the gross/net volume specifications, there is no way to calculate the tuning frequency based simply on the port displacement; all three specifications are interdependent. What are the outer dimensions of the box, what thickness is the material used to construct it, and what is the length of the port? Don't get too hung up on the port area since this is a temporary situation. Port area in correct proportion to the box volume is done to mitigate noisy ports, not whether they are tuned correctly. Yes, port area and the length in a given size box determine the tuning frequency, but the size of the opening and the general applied rule of thumb for that size is strictly for preventing chuffing, wind noise, and turbulence. As for the port and the driver exiting from the same size, it's not always possible, but the benefit is that the port, which is essentially an extension of the back wave of the driver, leaves the back of the driver, exits the port at about the same time, in sync with the front wave of the driver and combine to netting you that 3db extension of the bass output. [/QUOTE]

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