Nick V
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Silver Member Username: Volfenhagking1600SSD Wangin, Shawano, Wis... USA Post Number: 930 Registered: Oct-06 | I got his max dimensions... would you be able to create a design for a box? I wanna use aeroports also. sean said to make the box 1.85 cubic feet after the subwoofer and ports and try to get 26 square inches of port. And tuned to 38 HZ 17" Height 34" Width 23" Length |
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Silver Member Username: TatonkaPost Number: 861 Registered: Mar-07 | Sorry man, I havent learned aero ports yet. Im still getting better at some slightly complicated port designs. But if you want a standard slot port, I can do it easy |
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Gold Member Username: Extrmndor3Post Number: 6762 Registered: Feb-06 | you need 1 4 inch aeroport 9.43 inches long for your 1.85 tuned to 38 hz box  |
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Gold Member Username: InsearchofbassPost Number: 6412 Registered: Jun-04 | make your own aero port....heres how to adjust fo the flare " First get your pipe, lay down the measuring tape and mark it with a pencil. Because of the flaring, add around 25mm onto the end of the port. EG. If you design needs a 30cm port, mark 32.5cm" http://www.revmagazine.co.nz/forum/forums/thread-view.asp?tid=48&posts=8 Step 5 - Making Your Own Ports Yep its time again for a DIY aero tutorial. Why do I keep posting these ? To save you hard earned bucks on something you can easily and cheaply make yourself ! First get your pipe, lay down the measuring tape and mark it with a pencil. Because of the flaring, add around 25mm onto the end of the port. EG. If you design needs a 30cm port, mark 32.5cm Get out the hacksaw and slice your pipe down. De-burr the pipe with a deburring tool, sand paper or pocket knife. You need to de-burr otherwise the heat will cause it to slag and your port will become a permanant fixture of the bowl. Burred: Deburred: Now gently heat the end of the pipe. The purpose is to smooth down the edge a little bit, and get some temperature into the pipe before we start working it. You dont want to be melting the pipe just yet, just getting some temperature into it. Grab the cold end of the pipe, flip it over and place the warmed end onto the end of the bowl. Now is when you want to seriously warm it up. Heat around the base of the pipe (approx. 1cm) and slowly rotate it whilst doing it. With some practice you'll know how much is enough heat and how quickly to turn the pipe around the bowl. After a while you'll notice the edge of the pipe is starting to flare of its own accord, so start applying some pressure to the end of the pipe to cause it to flare more. Now that you've got the port flared out to where you want it, really put pressure behind it. This will open the flare up more than you want, but when the pipe cools it'll contract back to where you want it. Slowly tip cool water down the center of the pipe, you need just enough to cool the PVC down and set it into the flared shape. Here's the finished product. To clean it up hit it with some 180 grit sand paper around the edges to make it smooth or even out any edges, then wipe it out with a clean cloth. With some primer, you can paint the ports any colour you like. |
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Silver Member Username: TatonkaPost Number: 862 Registered: Mar-07 | Thanks lil rob, I can do it now im pretty sure. How do you figure in displacement? |
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Gold Member Username: InsearchofbassPost Number: 6413 Registered: Jun-04 | they are gonna need two 4 inch aeros for 500 watts |
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Gold Member Username: Extrmndor3Post Number: 6764 Registered: Feb-06 | no they dont need two... going with 2 you need to make each port almost 22 inches long each one.... and for that space you want you need only 1 and rms rating doesnt mean nothing to know how many ports you need. |
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Gold Member Username: InsearchofbassPost Number: 6414 Registered: Jun-04 | 4.25 by 4.25 by the length divided by 1728 gives you space taken up per port if your using a four inch pvc port |
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Silver Member Username: TatonkaPost Number: 863 Registered: Mar-07 | Ok, now im confused. Which is it and how to i figure displacement? |
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Gold Member Username: Extrmndor3Post Number: 6765 Registered: Feb-06 | you need 1 4 inch aeroport 9.43 inches long for your 1.85 tuned to 38 hz box :-) |
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Gold Member Username: InsearchofbassPost Number: 6415 Registered: Jun-04 | actually it does matter rms is exactly why you need more port.... but I understand why you want to use one port |
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Gold Member Username: InsearchofbassPost Number: 6416 Registered: Jun-04 | ok ill explain 4.25 by 4.25 by 8.75 = 18.04 divided by 1728 equals .09 |
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Gold Member Username: InsearchofbassPost Number: 6417 Registered: Jun-04 | 8.75 would be how much port would be inside the box |
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Gold Member Username: Extrmndor3Post Number: 6766 Registered: Feb-06 | rms is juzz power and it will not tell volume displacemnt of the woofer...how much air will move or how big and how many ports do you need... if you want to have an idea of how many and how big ports you want to use you need to check the volume displacement of the drivers.. Sd X xmax = volume displacement... then you will see how much air the subwoofer move and if one port will be enough for that application also you have to keep in mind how big the box is people using almost 20,000 watts are using only 1 slot port with pretty big port area and dont need tons of ports |
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Gold Member Username: InsearchofbassPost Number: 6420 Registered: Jun-04 | I stand corrected.....thanks lilrob |
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Gold Member Username: InsearchofbassPost Number: 6421 Registered: Jun-04 | im curious lilrob why does the box size play a role |
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Gold Member Username: InsearchofbassPost Number: 6422 Registered: Jun-04 | nick v go with lilrobs directions on the port |
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Silver Member Username: TatonkaPost Number: 864 Registered: Mar-07 | Thanks Sean and lil rob. I actully learned alot between yalls debate. lol Another quick question, does the placement of the port matter. Im going sub and port back, but where on the back does the port need to be? |
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Gold Member Username: Extrmndor3Post Number: 6767 Registered: Feb-06 | why does the box size play a role on how big and how many ports do you neeed you may ask???? ok lets have a 8 cb ft box with 1 4 inch port tuned a 36 hz x long is gonna sound like like a wistle right??/ right...... even 4 4 inch ports x large for a 8 cb ft box is too small.... |
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Silver Member Username: TatonkaPost Number: 865 Registered: Mar-07 | Here ya go. 2.03cuft gross, 1.85cuft NET External measurments: 14 height 14.25 depth 23.5 width Cuts: (2) 22 x 14.25 (top and bottom) (2) 14 x 14.25 (ends) (2) 12.5 x 22 (one of these will be the baffle) In the baffle, a 4.25" cirlce, and a 9" circle will be cut.   |
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Silver Member Username: TatonkaPost Number: 866 Registered: Mar-07 | welll.bump..lol |
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Gold Member Username: SouthernrebelMonroe, Louisiana 2 DD3515s, 1... Post Number: 5232 Registered: Mar-04 | Just a question for lilrob, -You do realize that port velocity will be highest right at tuning, right? -And just at tuning, the sub will be moving the LEAST. -Power and box size to play a role in the amount of port you need. The guys that use two 4" ports and 5000w per sub are doing so to keep sub excursion low. It creates back pressure and lets you pile the power to the sub. You just have to keep the back pressure in check, or you will fold a cone. Jamie, What sub/power are you using? |
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Gold Member Username: The_image_dynamicSan Diego Post Number: 2811 Registered: Dec-06 | LMAO @ assuming Lil Rob realizes anything at all. |
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Platinum Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 10052 Registered: Jun-06 |  |
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Gold Member Username: SouthernrebelMonroe, Louisiana 2 DD3515s, 1... Post Number: 5233 Registered: Mar-04 | Also, The volume of a 4" port (4.25" O.D.) 8.75" long would be 0.072cuft. pi * R^2 x L = Volume (in cu inches) 3.14 * 2.125^2 x 8.75 = 124.067 cu in Then divide by 1728 (to convert to cu ft) 124.067 / 1728 = .0717.....round to 0.072cuft |
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Silver Member Username: TatonkaPost Number: 868 Registered: Mar-07 | Well, I got close? lol |
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Silver Member Username: Volfenhagking1600SSD Wangin, Shawano, Wis... USA Post Number: 931 Registered: Oct-06 | my friend has a 10" volfenhag that he got for free and hes using a kicker zx750.1 |
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Gold Member Username: Extrmndor3Post Number: 6770 Registered: Feb-06 | canaan... well if the port velocity of his box is above and under 20% is good for everyday driving... but if his port velocity goes under 5% thats juzz for spl application he juzz need to check for the port velocity... because i know you know that port velocity means port port noise.. |
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Gold Member Username: InsearchofbassPost Number: 6423 Registered: Jun-04 | honestly I was thinkin it over and I dont by a long shot think one four inch aero port will be enough at 500 rms more like 250 to 300 rms in my opinion.....partially for the reasons that canaan pointed out |
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Gold Member Username: InsearchofbassPost Number: 6424 Registered: Jun-04 | also think lilrob was thinking this sub has very little excursion but it actually has 32 mm 16 mm true |
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Gold Member Username: InsearchofbassPost Number: 6426 Registered: Jun-04 | wait that was the 12 version I think but you get my point |
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Gold Member Username: SouthernrebelMonroe, Louisiana 2 DD3515s, 1... Post Number: 5238 Registered: Mar-04 | Since its just a Volfen 10", I would go ahead and do a 1.5cuft net box w/ 4" flared port ~13.75" long. Try this: 2) 13.5" x 23" 2) 11.5" x 23" 2) 15" x 11.5"  If you use a flared port, port noise will be minimal. No use buying 2 flared port for a Volfen. |
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Gold Member Username: InsearchofbassPost Number: 6428 Registered: Jun-04 | you could also make your own aero port and save money....heres the link again http://www.revmagazine.co.nz/forum/forums/thread-view.asp?tid=48&posts=8 by the way dont underestimate the 48 series volfenhag my friend is hittng 142.2 db with a 4812 on 900 rms with a 38 hz daily port tune spl was hit at 53 hz in a acura integra with a stock alternator |
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Gold Member Username: SouthernrebelMonroe, Louisiana 2 DD3515s, 1... Post Number: 5242 Registered: Mar-04 | Qts: .59 Fs: 52.5hz Phat Surround 1.5" coil ...um...yea... that 10" + low note = crap At least it was free |
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Gold Member Username: InsearchofbassPost Number: 6429 Registered: Jun-04 | well it does well for my friend down low....guess its install.....38 hz port tune hitting that hard (142.2 db) all the way up at 53 hz....thats way above tuning |
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Gold Member Username: SouthernrebelMonroe, Louisiana 2 DD3515s, 1... Post Number: 5244 Registered: Mar-04 | Yes, but the 12's Fs is much lower. |
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Gold Member Username: InsearchofbassPost Number: 6435 Registered: Jun-04 | oh ok my bad |
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Gold Member Username: InsearchofbassPost Number: 6436 Registered: Jun-04 | just a personal note id move the subwoofers placement away from being directly in front of the port and put it on the other end of the box in canaans design.....I think it would create better flow |
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