47 x 47 x 21 How big a box can i make
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Gold Member Username: Killerzracing71Post Number: 2132 Registered: Aug-05 | I want 4 18s tuned to 28hz Help me PLZ lol can i do 47 x47 x 18 and fire sub up port back |
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Gold Member Username: Nyyfan1315 MAG USA Post Number: 9406 Registered: Jul-06 | I got about 23.5cuft with those dimensions.....obviously does not include port or driver displacement. Just how many cuft you have there. |
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Gold Member Username: FrkkevinResonant Engineering..., Fort Worth... Email Post Number: 4960 Registered: Nov-05 | close to enough.. should be fine |
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Platinum Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 16260 Registered: Jun-06 | "I want 4 18s tuned to 28hz" I hope you have a moving van lol. |
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Gold Member Username: Killerzracing71Post Number: 2133 Registered: Aug-05 | Naw 92 caprice Wagon FTW LOL |
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Gold Member Username: •cam•BC Canada Post Number: 2443 Registered: Nov-06 | I got 19.77. I assumed his dims were external though. |
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Platinum Member Username: Rovin1 15 = 149.1DBsTrinidad & T... Post Number: 13631 Registered: Jul-05 | using 3\4 ndf as external i got 23.36cuft divide that by 4 sub = 5.84cuft after port & sub disp ur going to lose alot - can run 4 15s but in a compact box if were me id do 2 18s tuned around 33hz in that space for some nice insane sql ....  |
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Gold Member Username: •cam•BC Canada Post Number: 2444 Registered: Nov-06 | "Thread: 47 x 47 x 21 How big a box can i make" "can i do 47 x47 x 18 and fire sub up port back" I used the second dimensions. (45.5*45.5*16.5) |
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Gold Member Username: Killerzracing71Post Number: 2134 Registered: Aug-05 | http://www.subwoofertools.com/forum/ported-box.asp?Ew=47&Eh=19&Dia=11&Xmax=13&Vd =.1&NumW=3&Vb=18&Fb=28&Qts=&Vas=&Fs=&CE=0 did this and i belive i can do that |
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Gold Member Username: •cam•BC Canada Post Number: 2445 Registered: Nov-06 | Don't forget to brace that sucker. How much power do you have? |
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Silver Member Username: Prozack52Cincinnati, 2-D615D4 Dia... Post Number: 305 Registered: Feb-08 | are you doin 4 18 or 3 cause that link you have shows you doin 3 woofers |
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Silver Member Username: KingtutusLincoln, Nebraska U.s.a Post Number: 262 Registered: Dec-07 | that is the max u can do on subwoofertools |
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Gold Member Username: TejcurrentPost Number: 1298 Registered: Apr-07 | Assuming only double baffling the top for the subs that would make the box 22.464 (45.5x45.5x18.75==22.464ft) The subs will displace at least 1ft 21.464 To get enough port with a square port 20x11 at 29" deep would be good, tuning around 28hz and displacing 4.394ft, ending up with around 17.07 ft net. This may be off just slightly, but with that much space I wouldn't do more than 3 18s or 4 15s. I just clicked on that link from subwoofer tools, and that box wouldn't have enough port area imo. I'd make sure you had at least 200sq of port. If you want to do a slot port with the same box I mentioned make the port around 23 inches deep instead. I think it would displace around 3.253ft, so you'd have about 18.211ft net. That doesn't include bracing, but threaded rod wouldn't displace a whole lot. |
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Silver Member Username: Surferdude9371Im BTL Bumpin Post Number: 865 Registered: Mar-07 | im pretty sure your 18s will have an xmax larger than 13..... |
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Gold Member Username: Killerzracing71Post Number: 2135 Registered: Aug-05 | http://mach5audio.com/zen/index.php?main_page=product_info&cPath=66&products_id= 182 Unfortunetly it has only 12MM of XMAX LOL and these are cheap 18s man tired of spending 300 ea on a sub LOL I have a T1000BD ~1300rms if 400$ total shipped to my house Had the about the same curve on win isd 2 Q 18s but doesnt have a fall off like the Qs after 40hz Im not ballin like YOu guys LOL |
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Gold Member Username: TejcurrentPost Number: 1302 Registered: Apr-07 | Don't trust win isd, it graphs everything wrong imo. I'd only use it for port length and that sort of thing. I've talked to someone (I want to say Scott from Fi, but I don't intend to quote him or say it for sure) that said the BTL graphed better sealed than ported in winisd, which is obviously wrong. |
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Gold Member Username: Killerzracing71Post Number: 2136 Registered: Aug-05 |  darn well i just talked a guy that has 3 in his truck did 147 of 1k rms i like those numbers |
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