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<blockquote data-quote="hispls" data-source="post: 8588578" data-attributes="member: 614752">Corner to corner being the farthest two points in your vehicle.&nbsp; Corner up where you put your feet and the opposite corner in the rear of the passenger side for example.&nbsp; Speed of sound divided by the frequency is how long the wavelength is so your peaks will be at 1/2 and 1/4 of the wavelength.&nbsp; Wavelengths are pretty long and you&#039;ll get some gain above and below the frequency, and a car interior is such an oddball shape that you&#039;ll get ballpark at best, but it&#039;s a good estimating tool for what frequencies to watch.If you ever played with a wave pool/generator in physics class it&#039;s easier to picture how reflected waves build or cancel each other out.I believe flush end would be the port opening into and out of the box as opposed to sharing a side with a side wall, I haven&#039;t used a program that asks that in a while don&#039;t they have an illustration?&nbsp; Check the FAQ or &quot;help&quot; section to confirm.I find if you&#039;re off by a couple hz or a 5% margin of error you&#039;ll never hear the difference so I wouldn&#039;t get so hung up on precision.&nbsp; See for yourself by throwing numbers at it how little the curve changes with small variation in frequency or volume...bear in mind 1dB is the minimum audible change you&#039;ll notice.</blockquote>

[QUOTE="hispls, post: 8588578, member: 614752"] Corner to corner being the farthest two points in your vehicle. Corner up where you put your feet and the opposite corner in the rear of the passenger side for example. Speed of sound divided by the frequency is how long the wavelength is so your peaks will be at 1/2 and 1/4 of the wavelength. Wavelengths are pretty long and you'll get some gain above and below the frequency, and a car interior is such an oddball shape that you'll get ballpark at best, but it's a good estimating tool for what frequencies to watch. If you ever played with a wave pool/generator in physics class it's easier to picture how reflected waves build or cancel each other out. I believe flush end would be the port opening into and out of the box as opposed to sharing a side with a side wall, I haven't used a program that asks that in a while don't they have an illustration? Check the FAQ or "help" section to confirm. I find if you're off by a couple hz or a 5% margin of error you'll never hear the difference so I wouldn't get so hung up on precision. See for yourself by throwing numbers at it how little the curve changes with small variation in frequency or volume...bear in mind 1dB is the minimum audible change you'll notice. [/QUOTE]

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