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Audioque and RE box calculator QUESTIONS
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<blockquote data-quote="s_c" data-source="post: 6575615" data-attributes="member: 618001"><p>check the math for the box he stated it's not 9.597 cuft more like 8.92cuft this is with port displacement and the point 42 will be made up with the subs displacement so the box volume is closer to 8.5 cuft</p><p></p><p>outside dimension 49x 25.5 x 18 minus 1.5 from all sides to get 47.5w x 16.5hx 24L. this is the inside dimension if using 3/4 inch stock</p><p></p><p>port 8.25w x16.5h x i used 21L inch long just a guesstimate before tuning 16.5x9.75x21 multiply those to gather then divided by 1728 to get 1.9555cuft minus this from the box of a 10.88cuft box yields 8.92 cuft you must be using the out side as the inside dimensions lmao.and it yielding a bigger box like 9.597</p><p></p><p>here is the math i use to figure ports just encase you want to check the other calculators out this one does not use t/s speaks to calculate box if this gives any one a hint</p><p></p><p>Ported boxes</p><p></p><p>Letters used in formulas as follows</p><p></p><p>Av or area of vent or Port area=pie time radius squared of a 3 inch port which =7 x1 or just 7 for this formula do not use round port of like 3 and 4 inch it will throw off formula use the pie time radius of port to get those by 1 inch</p><p></p><p>vb or volume of box =cubic inches for this formula has to be cubic inches can be gotten from width time height times length can divide this by 1728 to get cubic feet for manufacture specks</p><p></p><p>lv equal length of vent in inches</p><p></p><p>fb equals tuning frequency</p><p></p><p>We use the formula above like so we do this first and write it down av(1.84time ten to the eight power )then hit equals and write it down</p><p></p><p>Next we take vb(lv+.823squae root of av ) take those to answers after written down and divide by each other and add it in the square root of this part like so .159 square root of answer = tuning frequency</p><p></p><p>General rules to ported boxes</p><p></p><p>The port must not be a ratio greater then a 9:1 area</p><p></p><p>Must not use more then plus or minus 20%of manufacture specks for their boxes of what they perform best in.</p><p></p><p>The port must be measure down the center line and a correction factor of .5 time h must be added in the h is from hxwxL of a port</p><p></p><p>fomula for area lxhxw/1728</p></blockquote><p></p>
[QUOTE="s_c, post: 6575615, member: 618001"] check the math for the box he stated it's not 9.597 cuft more like 8.92cuft this is with port displacement and the point 42 will be made up with the subs displacement so the box volume is closer to 8.5 cuft outside dimension 49x 25.5 x 18 minus 1.5 from all sides to get 47.5w x 16.5hx 24L. this is the inside dimension if using 3/4 inch stock port 8.25w x16.5h x i used 21L inch long just a guesstimate before tuning 16.5x9.75x21 multiply those to gather then divided by 1728 to get 1.9555cuft minus this from the box of a 10.88cuft box yields 8.92 cuft you must be using the out side as the inside dimensions lmao.and it yielding a bigger box like 9.597 here is the math i use to figure ports just encase you want to check the other calculators out this one does not use t/s speaks to calculate box if this gives any one a hint Ported boxes Letters used in formulas as follows Av or area of vent or Port area=pie time radius squared of a 3 inch port which =7 x1 or just 7 for this formula do not use round port of like 3 and 4 inch it will throw off formula use the pie time radius of port to get those by 1 inch vb or volume of box =cubic inches for this formula has to be cubic inches can be gotten from width time height times length can divide this by 1728 to get cubic feet for manufacture specks lv equal length of vent in inches fb equals tuning frequency We use the formula above like so we do this first and write it down av(1.84time ten to the eight power )then hit equals and write it down Next we take vb(lv+.823squae root of av ) take those to answers after written down and divide by each other and add it in the square root of this part like so .159 square root of answer = tuning frequency General rules to ported boxes The port must not be a ratio greater then a 9:1 area Must not use more then plus or minus 20%of manufacture specks for their boxes of what they perform best in. The port must be measure down the center line and a correction factor of .5 time h must be added in the h is from hxwxL of a port fomula for area lxhxw/1728 [/QUOTE]
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