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About CFD

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  1. Made this box design up today for a couple of the 10SW-4 subwoofers after seeing Toid's video of these drivers. Made for isobaric loading. Has a horn situation on it. 2.84 cubes and 25.7Hz tuning before the basket displacement. F3 around 21Hz.
  2. I still need to get a router because I totally feel you about the jigsaw cutouts. Never quite perfect. Been good enough for me for quite a while, though, and once the driver is in it's not noticeable. I can't be a perfectionist or I'll go insane
  3. You can get a circular saw that's adjustable for cutting 45s. It's what I do now
  4. Simple Transmission Line For Lower Power 12 Inch Subwoofers
  5. Box Design for 2 Sundown ZV5 18's 14.25 cubes after displacement and 29-30Hz tuning 48Wx28Dx24H inch external dimensions.
  6. We got the Epicenter figured out and I learned more about it. It actually works for what it's for, just hard to get a bearing on exactly what it does which is annoying for me. Oh well. Two more boxes for your bass wumpers to burr some womps or something. Single 18" 7 cubes, 34Hz. Fits in older Ford Explorers. The early 2000's ones. https://youtu.be/DXxOXha7Hgc Quad Kicker 12" box... or any other 12" subs that it's right for. 9.95 cu. ft. 33Hz. Fits older Escalade. https://youtu.be/o88oK5NN7Tk My GW-124 in my truck and yes
  7. Also I just want to make a little note that, for my area, I seem to be better than other installers/builders simply for not being a scammer. The last guy that came through for that box had someone else helping him out before and they kind of seemed to take advantage of him. He had 4 of those Boss Phantom 1150 Watt subs not knowing they weren't rated accurately, same with his Hifonics amp. Who ever set up his radio also had a high pass set to like 80 Hz on his subwoofer out which I couldn't figure out for a little while since I wasn't familiar with the radio. Then he also had one of those "Epic
  8. Let me know if you need more explanation on how that box goes together. I was pretty worn out a little while ago but doing better now.
  9. I'll have some videos on that box again inside a vehicle later. It was working pretty well IMO, and it's a neat box. More of an experiment than anything. I did hook it up to the same amp I had in the basement briefly inside of my truck then the amp blew out a couple of mosfets so I ordered new mosfets. I had the gain cranked to 100% without noticing, and it's only 4 ohm stable so. lol. It blowed up. Maybe that amp will be working in the future, either that or I'll get my JL amp fixed. Today I put a couple chinese chip amps in my truck for a pair of 6.5 woofers and 5 1/4 coaxials an
  10. With the port up, and the subs on each side, it would be loud as shit everywhere in the cabin. I think that'd be the way to go, and you have the design.
  11. 9.95 cu. ft. box for four 12 inch kickers tuned to 33Hz. Not sure what the basket displacement but guessing about 9.5 cu. ft. and 34 ish Hz tuning after displacement. The guy has his speakers in a 1.6 cu. ft./sub (before desplacement) 33Hz tuned prefab that I really don't like... this should get him going
  12. The cut sheets are downloadable from this link: https://archive.org/details/bracing-and-port-corner-location Use the program FreeCAD to look at the model to get a better idea on how it goes together.
  13. I just read about that 28 Hz was one of the "most efficient" frequencies. I missed that. You're tuned lower than you thought I'm pretty sure. If you want to get a 150 just to get one then You could probably get it by moving your port tuning up a couple different ways. 1. Shorten the port. 2. place solid objects in the box to take up some air volume. This will also bring the port tuning up some and you have a bit oversized box so you won't end up under the recommended box size. Otherwize, you've got a great box for making lots of low low bass!
  14. If the port is 4 inches tall, 28 inches wide, and 31 inches long then the tuning, I think, is more like 27 Hz If the port is 4 inches tall, 31 inches wide, and 28 inches long then the tuning, I think, is more like 29.5 Hz. I think the box might just be tuned lower than you think.... but that doesn't completely explain everything. I just used WinISD to get a gauge on what it's tuned at. I wasn't sure how to interpret your port measurements so I gave both ways I could interpret it.
  15. Any chance I could get some info on that box? Like internal dimensions, air volume, length, width, height of the port. Things seem kind of weird with how it's responding. Are the woofers moving a lot at 52 Hz? Usually at the tuning frequency the woofers move the least and the impedance is the least. It'd be really, really odd for your box to be tuned to 52 Hz yet peak under the tuning frequency I would think, and it would also be very odd for the box to be tuned to 35 Hz yet have the least impedance at 52 Hz... right? Would it not be impossible for a box to make peak SPL un
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