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Message: <blockquote data-quote="Buck" data-source="post: 8873696" data-attributes="member: 591582"><p>This is a tough one to tackle with ports speeds.  There's rules of thumb, but IMO you actually need a program like winisd that gives you some idea of what port speeds are.  A lot of times smaller woofers require bigger ports, vs a bigger woofer with a bigger box fundamentally tends to want a smaller port, and it's just due to air physics, and I mean inches squared per cube ratio of port area.  I've had to do 18-20 inches squared per cube for some sa-8 woofers to avoid port noise with slot ports, in some cases, and I've done 3000w 18's with less port area than that, ratio-wise, just to give you an idea how port area can be complicated.  How high or low you tune makes a big difference in port air velocity as well.</p></blockquote><p></p>

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