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Message: <blockquote data-quote="VWBobby" data-source="post: 8266093" data-attributes="member: 624844">I would use WinISD to model your sub in your desired box.  Select 1 or 2 round ports.... 1st try 1 round port at 6" diameter and see what your mach is at.  The mach should be in the green zone.  If it is showing red, your mach is too high and you could have port noise.  You can compensate by using more diameter or a longer port.I am using One 12" sub and needed Two 3" PSP's that are around 16" long for 31hz...   Something doesn't sound right for the length of a 6" port with Two 15" subs.... you should need a lot more port area.</blockquote>

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