BiGSt3v3 Posted April 29, 2020 Report Share Posted April 29, 2020 This is my very first time building a box and I'm having trouble figuring out my box volume. I think it may be too big. Here is all the information on the box and I would be so grateful if someone could calculate my box volume for me. The wood I used is Birch Plywood 3/4 thick. Top is double baffled 1.5 inches Outer Dimensions - Width 35.5in Height 19in Depth 14.5 Bracing - 3 pieces (2in x 34.75) 2 pieces (0.75in x 14in) 6 inch Areoport from BAP. Port is about 16.75 from flare to flare. Subwoofer is Skar ZVX-12. I believe subwoofer displacement is 0.15 Link to comment Share on other sites More sharing options...
Joshdashef Posted April 30, 2020 Report Share Posted April 30, 2020 Magical number is 1728 or the result of multiply 12 by it self 3 times. Or 12 x 12 x 12 = 1 cubic foot we will use this a lot. Your gross volume is 14.5 x 35.5 x 19 / 1728 = 5.66 cubic foot Your net internal volume is calculated by your internal dimensions, factoring in your double baffle, and subtracting any bracing, port volume, or other displacements like your subwoofer. The internal volume will equal 13 x 34 x 16.75 / 1728 = 4.28 cubic feet These other displacements can be split up into the following: Bracing, port, subwoofer, misc. Bracing: You said you have 2 x 34.75 (that is impossible it must be 2 x 34 unless you gave the wrong outer dimensions...35.5 - 0.75 - 0.75 = 34" internal... not sure on that) Lets call this piece 2 x 34 x 0.75 thick / 1728 = 0.0295 x 3 pieces = 0.089 cubic feet of bracing Bracing 2: Another piece of bracing that is 0.75 x 14 x 0.75 inch thick I assume ( again this has to be 13" long since your internal dimension is exterior minus the two faces thickness... 14.5 - 0.75 - 0.75 = 13... ) Lets call this piece 0.75 x 13 x 0.75 / 1728 = 0.0046 x 2 pieces = 0.009 cubic feet of bracing Port: Area of a circle is Pi * r^2, volume of a cylinder is Area x height or Pi * r^2 * Height. Your aero port has an internal diameter that is barely under 6 inches (BAP has it labeled as 5.915) but for all assumptions sake we will call it 6". Pi * 3^2 * 16.75 = 0.27 cubic feet of port displacement ( since you have some flare inside your box this could be a little under your actual port volume, so you could round up to .3 to be safe - shouldn't matter that much ) Subwoofer: You said it was 0.12 cubic feet of subwoofer displacement. Total displacements are equal to: 0.089 + 0.009 + 0.3 + 0.12 = 0.518 cubic feet of displacements Your net internal volume is calculated by subtracting total displacements from internal volume as follows: 4.28 - 0.518 = 3.767 cubic feet of internal volume SMD Tool Map (2022): https://www.stevemeadedesigns.com/board/topic/220267-smd-tool-map-2022/ My Port Size Calculator (in progress): https://www.stevemeadedesigns.com/board/topic/217087-port-size-calculator-in-progress/ Common Port Walls for a Slot Port: https://www.stevemeadedesigns.com/board/topic/217076-common-port-walls-why-it-matters-to-your-box/?tab=comments#comment-3240313 Link to comment Share on other sites More sharing options...
BiGSt3v3 Posted April 30, 2020 Author Report Share Posted April 30, 2020 Thanks for the lesson man👍🏿 You are a life saver! Link to comment Share on other sites More sharing options...
Joshdashef Posted April 30, 2020 Report Share Posted April 30, 2020 Just now, BiGSt3v3 said: Thanks for the lesson man<img src="> You are a life saver! Np, questions are always welcome here! SMD Tool Map (2022): https://www.stevemeadedesigns.com/board/topic/220267-smd-tool-map-2022/ My Port Size Calculator (in progress): https://www.stevemeadedesigns.com/board/topic/217087-port-size-calculator-in-progress/ Common Port Walls for a Slot Port: https://www.stevemeadedesigns.com/board/topic/217076-common-port-walls-why-it-matters-to-your-box/?tab=comments#comment-3240313 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.