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  #1  
Old 09-29-2012, 04:16 PM
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Default ported and getting LOW

my question is i had 289inches of port tuned to 32hz and i peaked at 33hz in my tahoe, then i change the port to 204 sq inch tuned to 31hz and it seems that it peaks alittle higher then then the first port. i havent gotten it on the meter yet since i have the new port but the new port is tuned 1hz lower but plays the highs better to my ear.

so if i want lows should i make the port have more sq inches and tune lower?

im really trying to learn about how to choose the right port specs.
the equipment im using is in my sig.

gunna be building a new box sometime soon and trying to do it right this time. goal is 52's on music which should be able to do with 4 18's on 7.5k

thanks to anyone that helps.
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C-pillar flat wall best score: 158.6db
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Last edited by massivespl; 09-29-2012 at 05:20 PM.
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  #2  
Old 09-29-2012, 04:20 PM
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A couple people have tested the theory that you need less port area for lower tuning and more port area for higher tuning. Might've been cj18 or one of the dc guys that had posted that.
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Old 09-29-2012, 04:24 PM
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Originally Posted by 99Bonney View Post
A couple people have tested the theory that you need less port area for lower tuning and more port area for higher tuning. Might've been cj18 or one of the dc guys that had posted that.
got a link to this? i tried searching for something but came up dry
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4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s
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Old 09-30-2012, 02:18 PM
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anyone have any info?
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C-pillar flat wall best score: 158.6db
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4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s
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Old 09-30-2012, 02:28 PM
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I believe it was on SMD. I tried searching for a bit too. Honestly, just "steal" a design that's proven lol. You know what they are.
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Old 09-30-2012, 02:31 PM
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I believe it was on SMD. I tried searching for a bit too. Honestly, just "steal" a design that's proven lol. You know what they are.
im trying to find a design that will work for me and my space. i really dont think just makin my box 3 inches shorter is going to gain me 4db but i could be wrong because next we gotta cut the box down 3 inches before we make a new one.
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4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
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Old 09-30-2012, 02:37 PM
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I mean there's only so many ways you can build the same specs on a square box and have same port area. With all else equal, messing with your vehicle.
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Old 09-30-2012, 02:52 PM
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Here's the quote that I read from CJ about tuning and port area.

"I cant explain why it is and dont really care to know the reasoning behind it, but in the builds I have done, the lower that you want to tune, the less port area you need. If you want to tune to 30hz or lower. 10-12in2 of port. 30-35hz 12-14in2, 35hz and up 14-16in2 of port.

In all honesty, so much of it just depends on the vehicle and the box. I can build 2 boxes that are built to the exact same specs and 1 may sound and peak completely different than the other.

This game we call car audio is all about testing. It can get really irritating at times, but the result in the end is worth the pain!"

Link
Port Area VS Low Tuning - Subwoofers / Enclosures - SMD Forum
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