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Message: <blockquote data-quote="PowerNaudio" data-source="post: 2441214" data-attributes="member: 561215"><p>another way that you can get a change in tuning freq. and a more accurate and pre-predicted tuning. with minimal mechanical equipment inside the enclosure, is by having for example 4 ports in the enclosure all the same length. then having only one of the ports open to get the lowest tuning of the enclosure and all 4 to get the highest tuned enclosure or even turn the ported enclosure into a sealed enclosure, making sure that the port area is big enough to keep port noise down when on a single port, and to change the tuning freq youll open the ports individualy from the inside with some sort of actuator, which will increase the tuning freq every time you open a port by a good 5Hz to 10Hz every time you open a port. so you can go from having a 25Hz tuned enclosure to a 45Hz tuned enclosure.</p></blockquote><p></p>

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