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<blockquote data-quote="maniackilla" data-source="post: 557041" data-attributes="member: 548976">i have read over many articles and never understood the EXACT reason behind port volume. i know if u have a box at say 5 cubes and you want it tuned to 30hz. you plug some numbers into a formula and it tells you exactly how much port area you need for that box to tune it to that freq *displacement accounted for*but is there something else? does more port area increase something? i forget what i read but it was basically something like more port area is equal to adding cone area or something. you add up cone area and port area to get some number. so a 10 with more port area could potentially be the same as a 15 with much less port area if im understanding it right.but wouldnt adding more port area in a box change the tuning? i think thats part of the reason my new setup isnt as loud as my old when it should be louder. the old box i had had a MASSIVE amount of port area and not so much volume for the actual subs. they were in a bed box. subs facing towards the middle of the box. they didnt have too much room behind them but there was easily a 8&quot; or so gap between the faces of the subs from the front of the box to the rear *each side of the baffle was about 6&quot; away from the rear of the box allowing the air to come up thru the middle between the subs*.... a few feet long. would that be port area, and in addition, account for more SPL?i know u can just compare x sub in x box with x power and yadda yadda yadda. but i would think this setup would be a little louder.</blockquote>

[QUOTE="maniackilla, post: 557041, member: 548976"] i have read over many articles and never understood the EXACT reason behind port volume. i know if u have a box at say 5 cubes and you want it tuned to 30hz. you plug some numbers into a formula and it tells you exactly how much port area you need for that box to tune it to that freq *displacement accounted for* but is there something else? does more port area increase something? i forget what i read but it was basically something like more port area is equal to adding cone area or something. you add up cone area and port area to get some number. so a 10 with more port area could potentially be the same as a 15 with much less port area if im understanding it right. but wouldnt adding more port area in a box change the tuning? i think thats part of the reason my new setup isnt as loud as my old when it should be louder. the old box i had had a MASSIVE amount of port area and not so much volume for the actual subs. they were in a bed box. subs facing towards the middle of the box. they didnt have too much room behind them but there was easily a 8" or so gap between the faces of the subs from the front of the box to the rear *each side of the baffle was about 6" away from the rear of the box allowing the air to come up thru the middle between the subs*.... a few feet long. would that be port area, and in addition, account for more SPL? i know u can just compare x sub in x box with x power and yadda yadda yadda. but i would think this setup would be a little louder. [/QUOTE]

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