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Verifying Port dimensions and splitting box design
Just had a quick question. Im taking some 15's I had in a previous build and putting them into a different car (2008 pontiac Grand prix) I am building a slot ported box for 2 skar audio evl 15's with the SPEAKERS AND SLOT FACING FRONT ( current box dimensions are( 35" W x 15.5" H x 34" D)with 3/4 MDF @ 8.82 cubes gross. I made about 10 card board box mock ups to test fit a box in the trunk which has a terrible shape... so the box dimensions are restricted to what will actually fit in the trunk. My current design is going to have latches (2 on each side and 2 on top) to take the back of the box off for both installation and optional trunk storage as I also do a lot of camping. My question is Port Dimensions. I have come up with a port of 4'W x 14"H x 12"D. I wanted to tune close to 30 hz- I have used multiple port calculators -Slot Port Width is restricted to only 4 inches due to box width and port Height is max at 14 inches. The Skar EVL 15 has an xmas of 23.5mm. Almost every calculator says a port length of 12-13 inches. Does this sound ok? it sounds short but all the reading I have done states usually the length is calculated on box depth and xmas. I wanted to get some opinions before I build the port. I though of doing to round ports but my thought is a slot port in the center will also act as bracing for the box and keep it simple and functional. The calculators say the same depth for 2 six inch round ports anyway so it would be about the same. I know that the round ports will reduce noise but bracing for the ports would probably take up more internal box volume than the slot port design.
https://cimg6.ibsrv.net/gimg/www.car...220a5d21d9.jpg https://cimg7.ibsrv.net/gimg/www.car...5748206357.jpg https://cimg9.ibsrv.net/gimg/www.car...9c2719b4b9.jpg https://cimg1.ibsrv.net/gimg/www.car...cc7043ed58.jpg https://cimg2.ibsrv.net/gimg/www.car...5d4f218c2e.jpg https://cimg3.ibsrv.net/gimg/www.car...cb6e1783d3.jpg https://cimg4.ibsrv.net/gimg/www.car...35703c1ede.jpg https://cimg5.ibsrv.net/gimg/www.car...f1e7d780d5.jpg https://cimg9.ibsrv.net/gimg/www.car...f06cbe7941.jpg https://cimg0.ibsrv.net/gimg/www.car...3c75770bac.jpg |
Update on progress
https://cimg9.ibsrv.net/gimg/www.car...f50e1306cd.jpg |
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So far the port design sounds great FYI. The roof has a dent so most of the noise I hear is that dent wobbling along with various headliner rattles. The box design is working well. I am now tearing it down to fiber glass resin the interior and bed liner the exterior of the box.
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Here's a link of the very first power up
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