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Message: <blockquote data-quote="Volenti" data-source="post: 2749037" data-attributes="member: 566487">When the ports are very large in area they tend to need to be very long as well, this length can introduce quarter wave effects that affect the response, also large ports react to the loading in the car and the real tuning frequency can be lower than predicted.As for how much port area is too much, I typically stick to under 1/2 the combined drivers SD for vented and bandpass. Other enclosure types, like transmision lines, need at least 1/2 SD to work properly at all and are optimum at 1-1.8 SD.</blockquote>

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