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ok i'm going to try and build my first box. I used winisd as best as i could to try and figure it out. It's a dd 3512 single sub in a 5 cuft ported to 40 hz. Here's my question. I'm going to slot port it. I was just wondering what the numbers in vent match mean? is it better to try and make the port as high and wide as i can fit in there? does that have an effect on how the sub will sound? thanks for the help

 
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I would download perfect box and use that. It will give you a box design and port sizing all in one program and then plot of the response of the sub. You can also call DD and ask a tech for his idea. Most techs are more then happy to talk on the phone for awhile discussing what will sound best for your car and your music style.

 
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I'm pretty sure that if you just make the slot the same surface area and depth, it'd be the same as a round one or something.

 
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where can i find the program Perfect Box??

 
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A lot of us use this program, WinISD. It sounds just like Perfect Box.

http://www.linearteam.dk/winisd.html

 
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Yeah that's what I use, winisd. I was just wondering if there's any advantage of making the slot bigger. It'll still be tuned to 40hz, but say I go from a width of 4 in to 6 in. It increases the length of my port by 7 in. Is there any reason to do this?

 
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Vent mach has to do with the velocity of air moving out of the port. If its to high you will have a noisy whistling port. If you going 5 cubes (assuming thats build to) you should use 50 square inches of port, 12.5 inches deep. added port area will help increase efficiency to a point. anything over about 80% of you cone area is going to act kinda like a hole in the box.