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<blockquote data-quote="Buck" data-source="post: 8777371" data-attributes="member: 591582">It can be whatever you want it to be.&nbsp; Easiest way is just to make the kerf radius the port radius (width), or close to it.&nbsp; The size of the kerf doesn&#039;t matter as much as just making sure you know your tuning.&nbsp; Like check out this kerf I designed, and this box was built and doing hair tricks in the mid 20&#039;s:[ATTACH=full]35035[/ATTACH][ATTACH=full]35036[/ATTACH]That kerf is MASSIVE.A kerf is just a coupling device for the port to couple with the cabin.&nbsp; It helps the waveforms more smoothly transition from the port to the cabin airspace, where the kerf helps the port air more slowly expand as it enters the cabin air, instead of brutally exiting a tiny port and rapidly expanding in every direction.&nbsp; Having flares/kerfs on ports raises their efficiency, because what it does, simply, is help the wave in the smaller port airspace somewhat controllably expand into the larger airspace of the cabin.If you don&#039;t want to do a kerf, you can always do a 45 flared port, which is something like this:[ATTACH=full]35037[/ATTACH][ATTACH=full]35038[/ATTACH]45&#039;s are much easier to do than kerfs, IMO.&nbsp; So, that&#039;s a different option that does the same thing, just in a different way.The size of the kerf generally doesn&#039;t matter, but you can run into loading problems if the kerf is wayyy too big and in a weird spot inside of the vehicle.</blockquote>

[QUOTE="Buck, post: 8777371, member: 591582"] It can be whatever you want it to be. Easiest way is just to make the kerf radius the port radius (width), or close to it. The size of the kerf doesn't matter as much as just making sure you know your tuning. Like check out this kerf I designed, and this box was built and doing hair tricks in the mid 20's: [ATTACH type="full" alt="35035"]35035[/ATTACH] [ATTACH type="full" alt="35036"]35036[/ATTACH] That kerf is MASSIVE. A kerf is just a coupling device for the port to couple with the cabin. It helps the waveforms more smoothly transition from the port to the cabin airspace, where the kerf helps the port air more slowly expand as it enters the cabin air, instead of brutally exiting a tiny port and rapidly expanding in every direction. Having flares/kerfs on ports raises their efficiency, because what it does, simply, is help the wave in the smaller port airspace somewhat controllably expand into the larger airspace of the cabin. If you don't want to do a kerf, you can always do a 45 flared port, which is something like this: [ATTACH type="full" alt="35037"]35037[/ATTACH] [ATTACH type="full" alt="35038"]35038[/ATTACH] 45's are much easier to do than kerfs, IMO. So, that's a different option that does the same thing, just in a different way. The size of the kerf generally doesn't matter, but you can run into loading problems if the kerf is wayyy too big and in a weird spot inside of the vehicle. [/QUOTE]

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