Xtreamdreamx Posted February 12, 2023 Report Share Posted February 12, 2023 I built this box design from Joe, but came up about an inch short in box depth from front of port to back of box, placing the port 4" from the back wall. I'm wondering if it's still a usable box now.my build version. Link to comment Share on other sites More sharing options...
Joe X Posted February 12, 2023 Report Share Posted February 12, 2023 Hi, welcome, let me know the external dimensions of your box, the dimensions of the port H,W,L, wood thickness and what skar subs are those exactly and I will tell you if it's good and how will it play, also if the clearance to the rear gate of your vehicle is at least 4" Link to comment Share on other sites More sharing options...
Xtreamdreamx Posted February 25, 2023 Author Report Share Posted February 25, 2023 3/4" birch, with 8" clearance to back hatch. Take into account the front to back length is now an inch shorter and the port is 4" from the back wall of the inside. The exact external measurement of my finished box are, 27 3/4" depth, 18 3/8" tall with double baffling, and 41" wide. Port external measurements in the box are 27 1/2" wide, 22 1/4" depth, and 4 3/4" tall. And four 1 1/4" braces that are 11 1/2" tall (the height between top of port and base of double baffle. Link to comment Share on other sites More sharing options...
Xtreamdreamx Posted February 25, 2023 Author Report Share Posted February 25, 2023 According to what I see I seem to be an inch or more short on my measurements putting me under the 8cu requirements. Worst-case I'm wondering if I inverted my subs would I gain the airspace needed, or if I went with the zvx inverted, would I get somewhere near what I need to be at ? I was looking at recommended port volume, not box volume as well, so I'm not sure where I should be at any longer lol. Link to comment Share on other sites More sharing options...
Joe X Posted February 25, 2023 Report Share Posted February 25, 2023 Your measurements produce the following spec using 0.14 cubic feet for each of the 4 drivers: Fb = 33.583 Hz Vb = 7.434 ft^3 Vb Per Driver = 1.858 ft^3 --- > skar wants 3 Port Area Per Driver = 26 in^2 --- > skar wants 38 The port being at 4" from the back wall is not a problem, it is not choked, it will just tune a bit lower than specified. Your box is heavily undersized for 12 ZVX drivers, reverse mounting would not be enough to compensate, if you used 3 drivers it would still be undersized. A decent box for some DC Audio subs but not for this. I would look to sell that box and rebuild to proper spec for those subs. Link to comment Share on other sites More sharing options...
Xtreamdreamx Posted February 26, 2023 Author Report Share Posted February 26, 2023 Alright, thank you for the help sir. Link to comment Share on other sites More sharing options...
Xtreamdreamx Posted February 26, 2023 Author Report Share Posted February 26, 2023 One last question sir, would this box work with the evl series ? The port area is over requirements, and the port volume is very close. And the 33.5hz would be close to the 32hz required with the 4" reduction in tuning you mentioned. Link to comment Share on other sites More sharing options...
Joe X Posted February 26, 2023 Report Share Posted February 26, 2023 Yes definitely the EVLs will work, even the much better VXF 12s would work perfectly on 6K ( but stronger bracing would be recommended for VXFs ). Link to comment Share on other sites More sharing options...
Xtreamdreamx Posted February 26, 2023 Author Report Share Posted February 26, 2023 Well the only difference I see is the number you input for displacement was wrong, how will that effect the findings we have come up with ? Link to comment Share on other sites More sharing options...
Joe X Posted February 26, 2023 Report Share Posted February 26, 2023 Yes I guessed the 0.14, medium power 12s are around that usually, if you notice the displacements are given in liters, when you convert to cubic feet 4.25 Liters ---> 0.15 cubic feet. Since it's a very small difference my opinions remain the same as before, the numbers would change a tiny bit but would be inaudible. Also notice that the VXF displacement is obviously wrong, the 4 and the 1 were swapped most likely. It should read 4.12. Link to comment Share on other sites More sharing options...
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