Box Questions
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Silver Member Username: MendonmafiaUSA Post Number: 150 Registered: Aug-06 | When figuring how much volume a port will displace do i consider the port to be a solid cylinder or do i take its literall volume? |
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Silver Member Username: MendonmafiaUSA Post Number: 152 Registered: Aug-06 | bump |
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Gold Member Username: Basshead86Google is your Friend, FL Post Number: 4793 Registered: Aug-05 | slot or pvc?? to get the volume of each. 1. slot. find the port area...by measureing the height and width of oyur port opening. then take that number and multiply it by how many inches deep your port is going to be. 2. pvc or flared. do the formula pier2 pie = ~3.14 r = radius of the circle....or half of the diameter. if you have a 4" then the r = 2, 6"...r = 3  after you have done the pier2 formula to get the area. you then multiply that by the depth of the port. and you have your volume if you have multiple ports than you simply mulitply you total area by however many you have. to answer your question, when configuring port volume...oyu use either one of those formulas i have...so literal volume. lol |
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Silver Member Username: MendonmafiaUSA Post Number: 153 Registered: Aug-06 | actually that would be the volume if it were a solid cylinder. literal volume would be how much the port displaces is water so only the wall thickness would displace the water. So how do i factor it in, as a solid cylinder, or has its actual volume(just the wall thickness not counting the air inside the port)? |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 3173 Registered: Mar-04 | as a cylinder. |
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Gold Member Username: Basshead86Google is your Friend, FL Post Number: 4811 Registered: Aug-05 | ^^^yeah, the way you described it was very fu**ed up. |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 3174 Registered: Mar-04 | EX...you want a 1.75cuft box tuned to 35hz w/ a 4" pvc port for your 12" RE SE. for 1.75cuft net (volume after all displacements accounted for) you would need a 4" port 12.95" long. (call it 13") port displacment---0.095 cu ft sub displacment---0.15 cu ft the gross(total) box volume you would need to get the box correct would be 1.995 cuft (2cuft ). get it? |
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Silver Member Username: MendonmafiaUSA Post Number: 154 Registered: Aug-06 | ok i got it i think . so you factor in the air inside the port as well as the tube itself rite? so you take the OD of the port and find the volume as if it were solid. correct? in other words it is not the actual volume of the port. because the ports voulme is actually very small because it is not soild. |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 3181 Registered: Mar-04 | yep...you got it |
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Gold Member Username: RovinTrinidad & T... Post Number: 8918 Registered: Jul-05 | 4get doing the math - use this http://www.the12volt.com/caraudio/boxcalcs.asp aint the internet gr8 ....lol |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 3182 Registered: Mar-04 | math > rovin -sorry rovin...just messing w/ ya |
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Gold Member Username: RovinTrinidad & T... Post Number: 8921 Registered: Jul-05 | no biggie - i had a really good math teacher when i was age 9/10 & everything that was thought 2 me will stick in my head til im dead - but now with internet everything is handed 2 u on a silver platter tho i noticed some ppl online (not on this thread) cannot even do L x H x W to find volume of a rectangular object - ...lol |
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Silver Member Username: MendonmafiaUSA Post Number: 157 Registered: Aug-06 | hahahaha no wedges for them. im licky im kinda good at math cuz im doing an isoceles trapizoid so i cna have the box tured either way subs in or out and still fit the angle of my rear seats. but its suprizingly hard to make this work. |
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