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Old 12-28-2013, 02:38 PM
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Default Can someone confirm this design for me?

This is for a single 18" SP4. Sub up, port back on passanger side. Should I do the port on the bottom? I'm not going for numbers. Just something temporary


Last edited by doug118; 12-28-2013 at 02:42 PM.
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Old 12-28-2013, 03:09 PM
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Aim for about 12-14 sq inches of port area per foot and 60-90 on port area.

Do you really think you need 1.5" thickness all around?
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Old 12-28-2013, 03:12 PM
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Quote:
Originally Posted by GiGLZ View Post
Aim for about 12-14 sq inches of port area per foot and 60-90 on port area.

Do you really think you need 1.5" thickness all around?
Probably not but I don't want to do much internal bracing
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Old 12-28-2013, 03:56 PM
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made a few changes. Which one looks better?



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Old 12-28-2013, 04:30 PM
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Bottom one looks better but need more port area per ft. Shrink the box down to about 6.5 cubes net
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Old 12-28-2013, 08:08 PM
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Unless you're doing a port that sits away from any of the walls, you need to enter the number of port walls as it will change the volume and tuning. See the help menu for how they are laid out.
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Old 12-30-2013, 12:59 AM
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Built the last one, but added the common walls and shortened the port to 17". Not sure if something is wrong or I'm just expecting too much from it. I went from a pair of sa15's in a 4th order to a single 18. Some songs are actually louder than the 4th but most of them lack the output I expected


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Old 12-30-2013, 01:17 AM
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If you didn't change anything from the calculator the box isn't tuned right. You didn't account for number of walls the port touches. Makes a HUGE difference. And the port is really small. 14-16" per cube will be much louder. Also if your port.is just L shaped then the sub would be better more towards the port and away from the opening of the port. It's not letting the air compress inside it.

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Old 12-30-2013, 01:57 AM
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People never take into account that the port will cause box rise if not properly design for said vehicle and subs. Your probably louder on the lower end where your box is tuned at, but lack the higher frequency because of box rise.

In my opinion is to get a proper box design by Pete pwkdesigns.com but if you go to anyone else its either a hit or a miss like your box.
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Old 12-30-2013, 02:10 AM
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Build a new box. Sub up port firing into driver side. Needs more port area too. I generally try to go 12-15 sq in per cube for a slot and 9-12 for a tube port.
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