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Port length phase issues

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Is there a way to tell if the port will be in phase with the woofers? I assume this would depend on the frequency it's ported at and length.

My concern is placement. I would like to place ports firing beside the woofers, but if the port is out of phase, would this cause cancellation and reduce output?

I assume port beside woofer would give most output due to coupling.. is this theory incorrect?

Port length has yet to be determined upon this answer. Could someone please supply a formula? experience or theory is welcome.

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