How does this look?
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 356 Registered: May-06 | I just started playing around with sketchup. how does this look? any major flaws other than improper port length and the absence of a right side wall? its 25x17x17.75 around 3.4 cubes after displacement. i am planning to tune it down to 30hz. what ya think? |
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Silver Member Username: Andrew571Stillwater/Edmond, Oklahoma USA Post Number: 603 Registered: Oct-05 | it looks like ply or particle board... NOOB haha jk, looks pretty decent |
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Silver Member Username: Impala63ragPost Number: 365 Registered: Sep-06 | What ya puttin in it? |
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Silver Member Username: WarlokOrlando, FL USA Post Number: 140 Registered: Dec-05 | works for me |
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Silver Member Username: Adam_sPost Number: 434 Registered: Aug-04 | Are you going to have the ports external like the picture?? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 357 Registered: May-06 | thanks a lot andrizzle! lol. i want to build a new box for my Q 15. last time i only got advice from the RE L port calc, and it wasnt that smart. i would also do penty of bracing. oh ya and thats 26.5 wide not 25. havoc was helping my out last night but i have one question. after driver displacement and all, it is 3.4 cubes. with one 4inch port the length would have to be 8.14124 to get it to 30hz. i want to do two, so how do i figure the length of each port? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 358 Registered: May-06 | ya dude thats the plan. |
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Silver Member Username: Adam_sPost Number: 442 Registered: Aug-04 | Straight Length Port required 19.21 Flare Length Port required 20.21 That is for 30 hz with 4 inch ports. Are you planning on flared ports or just piping? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 360 Registered: May-06 | ok well then i wont be able to have the ports outside cause that is just too long. i am gonna do flared, but now im not sure how to design it now. i might have to put them on the side.  |
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Silver Member Username: Adam_sPost Number: 447 Registered: Aug-04 | Have you thought about just doing a slot port? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 361 Registered: May-06 | ya i may just do that. less complicated, but the overall box needs to be bigger. i was gonna to flared to keep the size down. ill ask havoc to dream me up a good slot port box. |
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Silver Member Username: Adam_sPost Number: 448 Registered: Aug-04 | are those the maximum dimensions that you have for the box above?? |
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Silver Member Username: Adam_sPost Number: 449 Registered: Aug-04 | If not. Here is one that would work well for you. http://www.subwoofertools.com/forum/ported-box.asp?Ew=25&Eh=17&Dia=9&Xmax=10&Vd= .19&NumW=1&Vb=3.2&Fb=30&Qts=&Vas=&Fs=&CE=1.5 |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 362 Registered: May-06 | those are the ones i want but they can change. i am designing a slot port now. how do i measure the port length? is it the shortest distance withing the port? |
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Silver Member Username: Adam_sPost Number: 453 Registered: Aug-04 | you use the short side of the port wall I believe. |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 363 Registered: May-06 | ok one for you box speacialists. would this work? outside demensions: 26.5 W X 18.25D X 17H. the port opening and width all the way through is 2.5 inches, and the port boards are 14.25 long and 15.5 tall.  |
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Silver Member Username: Adam_sPost Number: 458 Registered: Aug-04 | What would the specs be on that box?? Or is that what you are trying to figure out?? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 364 Registered: May-06 | i gave all the specs i know. i wanna know how to determine the tuning. |
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Silver Member Username: Adam_sPost Number: 460 Registered: Aug-04 | I calculated it roughly and its about a 2.6 cuft box after port displacment and is tuned to about 30 hz....rough calculations while I am sittin in bio. |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 365 Registered: May-06 | groovy! so if i were to set the left wall a little farther out i would reach the desired cuft of around 3? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 366 Registered: May-06 | well i guess this will be the final build.  |
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Silver Member Username: Andrew571Stillwater/Edmond, Oklahoma USA Post Number: 605 Registered: Oct-05 | the port seems really long? |
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Silver Member Username: Zoomiebird15 Wanger Premier Member, FL Post Number: 370 Registered: May-06 | i dont really know what it should be, since know one seems to know how to figure the tuning frequency other than subwoofer tools box make. either that or they just dont want to tell me. "I calculated it roughly and its about a 2.6 cuft box after port displacment and is tuned to about 30 hz....rough calculations while I am sittin in bio." im kinda going by that and i want it tuned low, shaking things is great fun!! im not gonna build until i know for sure what its tuned to though. |
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Silver Member Username: Adam_sPost Number: 463 Registered: Aug-04 | The port has to be really long because there is quite a bit of port area and also the box isnt extremly big for the amount of port area. If he made the port only 2 inches wide the port would become a lot shorter. |
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