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  #1  
Old 07-23-2015, 08:37 PM
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Default Port help for lowws

Ok so I need more low end in my life. Right now I did a 157db at 37hz. But it falls off hard under 30hz. My wall is 29cubes after displacement with 300" of port tuned to 30hz. I think the problem is the port is to short. The port is only 14" deep and 15" deep if u count the rounded over trim ring. I was thinking of making an insert to make the port longer more like 24" deep but that will take away from my port area. Any ideas? U can check out my build Log to see what it looks like if needed.

Cpillar wall build.
Everyone I know with ported walls or boxes and can play super low have deep ports like 23"-30" deep. So that got me thinking I more depth.
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C-pillar flat wall best score: 158.6db
1 vital power 700.1 @ .33ohm
4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s

Last edited by massivespl; 07-23-2015 at 10:17 PM. Reason: Added build log link
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Old 07-23-2015, 08:47 PM
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The reason people have their ports that long is to achieve a low tuning, your port is so small that is why you only need 14" deep. Idk what else to say but to try it.
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Old 07-23-2015, 08:49 PM
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The reason people have their ports that long is to achieve a low tuning, your port is so small that is why you only need 14" deep. Idk what else to say but to try it.


Small? I thought 300" was bout the norm for 4 18 walls?
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C-pillar flat wall best score: 158.6db
1 vital power 700.1 @ .33ohm
4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s
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Old 07-23-2015, 08:56 PM
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Small? I thought 300" was bout the norm for 4 18 walls?
Yeah but normal 4 18 walls are not 29 cubes after displacement.
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Old 07-23-2015, 08:57 PM
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Small? I thought 300" was bout the norm for 4 18 walls?
If it was normal then why is your port only 14" and theirs are double in length to achieve the same tuning freq.
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Old 07-23-2015, 09:27 PM
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My 4 18's have 450 square inches of port, 24" length with around 34 cubes after displacements. It gets down on 26hz, make ya feel like you're floating in the seat. First few burps to find my peak were 158's @50hz and 157.4 @34, didn't test lower but it didn't seem any less violent at 26hz. That's not full tilt either. That was with a old deck with my phone as source, I just got an 80prs to get it all tuned up proper.

Adding length to the port, adding pvc to the inside/back of port as a roundover, or taking away port area would all help with the lows. Lows and metering are not usually done together. I'd build a plug for the demo's/lows where 1db is hardly noticeable, then pull it out to meter.
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Old 07-23-2015, 09:28 PM
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You are basically running 10^2. IMO that isn't enough port area. In the past when I've peaked a fair amount above tuning I've felt it to be due to lack of port area
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Old 07-23-2015, 09:54 PM
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Dang so I need more port.
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C-pillar flat wall best score: 158.6db
1 vital power 700.1 @ .33ohm
4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s
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Old 07-23-2015, 10:09 PM
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Ya a wall tuned at 30 should demolish low end. What Subs?
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Old 07-23-2015, 10:11 PM
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Check out my sig nsv3...

In my last wall I had 2 of them in 22cubes with 270" port tuned to 30hz and the port was 22" deep and it played down into the teens.. I miss that so much.
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C-pillar flat wall best score: 158.6db
1 vital power 700.1 @ .33ohm
4 NSV3 18s
8 pwx crescendo 10s
Quad excessive amperage 350alts
4 juicebox 3100s
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