thegreat22 Posted March 17, 2011 Report Share Posted March 17, 2011 I want to build a box 42W 20H 16D ported tuned to 29-32hz. I have all the tools. Just need help with the port. The subs will be 4 rockford fosgate p3 10's. This will be my first box built. I want subs back port back. All help is appreciated thanks guys Link to comment Share on other sites More sharing options...
EclipseChris Posted March 17, 2011 Report Share Posted March 17, 2011 If you have about the right power for what they are rated then go with an L port type box. With those dimensions do a port with 18.5" height 4" width and 35" deep. This will get tuning to 32hz with 4.35 net cubic feet before bracing/sub displacement. With 17 square inches per cubic foot like above you should give the subs a little less power than they are rated at. i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
thegreat22 Posted March 17, 2011 Author Report Share Posted March 17, 2011 The amp is an audiopipe 1800 Link to comment Share on other sites More sharing options...
thegreat22 Posted March 17, 2011 Author Report Share Posted March 17, 2011 How would I go about bracing the box? Link to comment Share on other sites More sharing options...
EclipseChris Posted March 17, 2011 Report Share Posted March 17, 2011 Search around a little bit, there's a million ways to do so. Fiberglass, all thread, dowel rod, box design itself, and many many more. i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
thegreat22 Posted March 17, 2011 Author Report Share Posted March 17, 2011 Decided to use 1 inch dowel rods Link to comment Share on other sites More sharing options...
RAM_Designs Posted March 17, 2011 Report Share Posted March 17, 2011 If you have about the right power for what they are rated then go with an L port type box. With those dimensions do a port with 18.5" height 4" width and 35" deep. This will get tuning to 32hz with 4.35 net cubic feet before bracing/sub displacement. Which you need to take into account. I actually got 6.28ft^3 gross air space. Take off 1.78ft^3(4.75"x18.5"x35" / 1728) for the 35" long port(assuming you meant 35" long inside the box), and you have 4.5ft^3 before sub and port displacement. Assuming .08ft^3 displacement for each sub, and .1ft^3 for bracing, you end up with about 4.1ft^3 with a 34hz tuning. If he keeps the same port length but changes the port width to 3.5", it'll give him ~4.25ft^3 after all displacements and a 31hz tuning...just an option if he's looking for a little more low-end. Ryan Miskin - owner of RAM Designs I have my PM's turned off, please email at <script data-cfhash='f9e31' type="text/javascript"> /* */</script> 2200+ designs since March 2011... Link to comment Share on other sites More sharing options...
thegreat22 Posted March 17, 2011 Author Report Share Posted March 17, 2011 Lows over mid-high notes any day. Manual says sub displacement is .074 Does that change anything. Ram or anybody that's willing can you hook me up with a sketch? Should I place the dowels from top to bottom, front to back or both? Would it make a difference if I add an .5-1 inch to the depth or is the current plan efficient for the subs? Sorry for the questions just want to get this box done right. Link to comment Share on other sites More sharing options...
EclipseChris Posted March 17, 2011 Report Share Posted March 17, 2011 I would go with the 3.5 wide like he said, for the 31hz tuning. i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
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