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<blockquote data-quote="joeldirt" data-source="post: 762882" data-attributes="member: 558163">1.) Generally keep the ports the same distance or more that they are in diameter. YOu want to make sure the same amount of air is traveling in and out of the ports. if too close the air will be moving in and out of each port at different volumes and speeds, giving you an inacurate tuned frequency for what you are shooting for.&nbsp; YOu also want to make sure that they have enough space to achieve a good airflow. Too close to the bottom will cause a restriction to the natural movement of air, and cause a whistling, or added port noise.2) you can get the 4&quot; port at your local hardware store. PVC pipe is standard port material. you can round over the ends using a round over bit and router to further reduce unwanted port nosie.&nbsp; If you know any plumbers, or work near a construction site, you can come acrossed alot of PVC.3) Did you account for bracing in your design? A solid ridgid construction is verry essential in the sound quality. Good luck.</blockquote>

[QUOTE="joeldirt, post: 762882, member: 558163"] 1.) Generally keep the ports the same distance or more that they are in diameter. YOu want to make sure the same amount of air is traveling in and out of the ports. if too close the air will be moving in and out of each port at different volumes and speeds, giving you an inacurate tuned frequency for what you are shooting for. YOu also want to make sure that they have enough space to achieve a good airflow. Too close to the bottom will cause a restriction to the natural movement of air, and cause a whistling, or added port noise. 2) you can get the 4" port at your local hardware store. PVC pipe is standard port material. you can round over the ends using a round over bit and router to further reduce unwanted port nosie. If you know any plumbers, or work near a construction site, you can come acrossed alot of PVC. 3) Did you account for bracing in your design? A solid ridgid construction is verry essential in the sound quality. Good luck. [/QUOTE]

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