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Message: <blockquote data-quote="Jeffdachef" data-source="post: 8544756" data-attributes="member: 650438">You can step down to a 3 inch port 16 inches long if you want it musical but as of now, torres calculator and your results dont lie, you built a box not properly tuned to deep lows. Your port per cube is on the higher side and your airspace is on the low side. This is basically a burp box format.   If you want to keep the 4 inch port, you need much more airspace.   If you want to keep the same box, you need a smaller port.It cant be 1.35 cubes after displacement, thats completely impossible because your port itself takes up ~ 0.25 cubes of displacement(assuming your port thickness is extremely low) and your net airspace is 1.44.  Not sure what you are using to calculate but you might want to switch programs.2x2x3.14x29= 364.24/1728 = .21 thats with no port thickness accounted for. plus .16 from subs.</blockquote>

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