Ported Box tuning??!!?
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Bronze Member Username: GtasouthparkPost Number: 13 Registered: Oct-07 | Ok, so ive read tons of stuff, and i know i need a couple of sub boxes. (2 boxes, both 1.7cu feet for a 12" alpine type R). anyway, i know they need to be ported... but how do you do that. like what is tuned to 28hz or w/e mean? (i want to build my own box, because they are really expensive, and i don't have a lot of room in my trunk). soooo. anybody know what the deal is? |
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Silver Member Username: O0airjordan120oMN US Post Number: 142 Registered: Sep-07 | well there are a few diff. kind of ports. squares, slot, and circular. i would go with a slot. just cus its easier. u will want around 12 sq inches per square foot. so if ur box is 1ft3 u would make a slot like 6x2. the 28 hz is the frequency u want to be louder then the rest. higher the number higher the pitch. you change the frequency by changing the port LENGTH. so say i have a 2x6 port its going to be maybe 14 inches deep to hit a certain frequency. the longer the port the lower the frequency. heres a site that will do all the plans for you if u just enter the data http://www.subwoofertools.com/forum/ported-box.asp?Ew=28&Eh=15&Dia=6&Xmax=15.8&V d=.197&NumW=1&Vb=2&Fb=30&Qts=.35&Vas=.81&Fs=34.96&CE=1.5 and heres a site if u want to do a custom box will calculate the port size. http://www.carstereo.com/help/Articles.cfm?id=31 |
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Bronze Member Username: GtasouthparkPost Number: 14 Registered: Oct-07 | wow thanks a lot man. i was gonna make some weird lookin box, kinda like a triangle or somethin. thanks man.  |
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Silver Member Username: O0airjordan120oMN US Post Number: 143 Registered: Sep-07 | and heres the box i would go with for you. http://www.subwoofertools.com/forum/ported-box.asp?Ew=24&Eh=15&Dia=6&Xmax=18.2&V d=.071&NumW=1&Vb=2&Fb=30&Qts=0.47&Vas=1.58916&Fs=29&CE=0 |
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Bronze Member Username: GtasouthparkPost Number: 15 Registered: Oct-07 | hey, that might just work. The thing says 1.7cu feet for recommended install... so is there a difference between 2cu feet and 1.7? + whats the difference between tuning the box to 28hz rather than 30 or 32 (like what sound difference)? |
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Silver Member Username: O0airjordan120oMN US Post Number: 144 Registered: Sep-07 | more air space=louder. probably wont hear a difference from 28 to 30 or 30 to 32 but u might hear a diff from 28 to 32. the lower the number the lower the sound so at 28 it will sound lower then at 32 which will sound higher pitched. most SPL enclosers are around 40 to 50. most street are around 30. i have mine around 35 and sounds good. i would go with 30 if i were you |
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Bronze Member Username: GtasouthparkPost Number: 16 Registered: Oct-07 | yeah, i was thinkin about goin for a SPL one.. but then i thought.. i don't wanna be one of those crazy guys who drives around, and it sounds like your car is breakin down... and rattling.. instead of bass. how do you get it to not raddle like that, if its in a seperate trunk? |
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Gold Member Username: InsearchofbassPost Number: 6814 Registered: Jun-04 | I would go with 14 square inches (or a little more) per cubic foot like digital designs recomends that should be good for 1200 rms total at 28 hz if your tuning that low |
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Gold Member Username: InsearchofbassPost Number: 6815 Registered: Jun-04 | to be safe I would go with more port area though your on the borderline with 14 square inches per cubic feet at 1 cubic foot per sub tuned to 28 hz |
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Gold Member Username: Nd4spd18Northwest PA Post Number: 3487 Registered: Jul-06 | Yeah, ya don't want to have too little port area. Port noise FTL |
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Silver Member Username: O0airjordan120oMN US Post Number: 146 Registered: Sep-07 | true. 12 is minimum and he is only pushin 500 rms. i dont know what to do to minimize rattling, i have my sub in my truck so dont have to worry about it. arnt there special mats you can buy from like bestbuy and sh!t? |
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New member Username: Htown860Post Number: 7 Registered: Oct-07 | I'm not tryin to steal the thread, but how would you guys go about porting a box for an 18" soundsplinter rl-p? it says optimal ported box size is 5cu.ft... |
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Silver Member Username: O0airjordan120oMN US Post Number: 147 Registered: Sep-07 | well for 5 cuft i would go with a 20x30x14.5 box with a 20x3.5 slot port. if you tune it to 30 hz then u want the vent length to be about 33.25in |
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Silver Member Username: O0airjordan120oMN US Post Number: 148 Registered: Sep-07 | BTW those demensions are inside demensions so u need to cut everything a little longer... |
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New member Username: Htown860Post Number: 8 Registered: Oct-07 | alright, so you're sayin 70in^2 port area? |
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Silver Member Username: O0airjordan120oMN US Post Number: 149 Registered: Sep-07 | ya. which is 14 per quare foot |
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Silver Member Username: O0airjordan120oMN US Post Number: 150 Registered: Sep-07 | i ment 14in2 per cubic foot, my bad |
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