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General Car Audio
Port noise?
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<blockquote data-quote="2010HHRUMADBRUH" data-source="post: 8227896" data-attributes="member: 606055"><p>I noticed what I think is referred to as "port noise" today.</p><p></p><p>I went to inspect it while I let the sub do it's thing, and I thougtht one of the panels or something was rattling, but I figured out it was the port making the noise. It almost sounds like a plastic bag was placed near the port or the sub is violently rattlling some panels in the cargo area...very confusing unless you physically inspect it while the sub is doing some work.</p><p></p><p>There is a LOT of air going through the port. I never noticed this happening with the lower powered subs I had in the box before, so I assume this might have something to do with the fact that the weaker 12"s weren't physically able to move that much air.</p><p></p><p>I went from a JL 12w3v3-4 (500w rms), to a VVME RD-12 (700-ish rms), and now I'm running a DC LVL 4 m2.</p><p></p><p>It still slaps, but it sounds like something is wrong now, at all frequencies. Maybe I didn't notice it because I wasn't used to the amount of bass it put out, but now that I've had it for a while, I got used to it and I'm able to hear how the sub and box are doing, instead of just being audibly blinded by the bass, perhaps?</p><p></p><p>The box was built exactly to spec for the JL 12w3v3, and up until now, has given me no problems.</p><p></p><p><a href="http://www.jlaudio.com/12w3v3-4-car-audio-w3v3-subwoofer-drivers-92154" target="_blank">12W3v3-4 - Car Audio - Subwoofer Drivers - W3v3 - JL Audio</a> (scroll down to "ported enclosure specifications") the only thing I see different is that I remember JL saying that the box would be tuned to 32hz. Maybe it has changed? Anyways, DC recommends 1.5 cubes ported, and the displacement on the sub is 0.18, which would make the final internal volume at 1.57 if I'm not mistaken...would this .07 make a huge difference?</p><p></p><p>What should I measure/take pictures of? I can take pics of the inside of the box, and the port and whatever else...maybe that would help determine if there is a design flaw or other reason why I'm experiencing this?</p><p></p><p>I have heard people talking about "sloppy fart bass" and I always thought that was what I wanted, as bass is bass to me, but now I think I understand what they were talking about, and it's unnacceptable.</p></blockquote><p></p>
[QUOTE="2010HHRUMADBRUH, post: 8227896, member: 606055"] I noticed what I think is referred to as "port noise" today. I went to inspect it while I let the sub do it's thing, and I thougtht one of the panels or something was rattling, but I figured out it was the port making the noise. It almost sounds like a plastic bag was placed near the port or the sub is violently rattlling some panels in the cargo area...very confusing unless you physically inspect it while the sub is doing some work. There is a LOT of air going through the port. I never noticed this happening with the lower powered subs I had in the box before, so I assume this might have something to do with the fact that the weaker 12"s weren't physically able to move that much air. I went from a JL 12w3v3-4 (500w rms), to a VVME RD-12 (700-ish rms), and now I'm running a DC LVL 4 m2. It still slaps, but it sounds like something is wrong now, at all frequencies. Maybe I didn't notice it because I wasn't used to the amount of bass it put out, but now that I've had it for a while, I got used to it and I'm able to hear how the sub and box are doing, instead of just being audibly blinded by the bass, perhaps? The box was built exactly to spec for the JL 12w3v3, and up until now, has given me no problems. [URL="http://www.jlaudio.com/12w3v3-4-car-audio-w3v3-subwoofer-drivers-92154"]12W3v3-4 - Car Audio - Subwoofer Drivers - W3v3 - JL Audio[/URL] (scroll down to "ported enclosure specifications") the only thing I see different is that I remember JL saying that the box would be tuned to 32hz. Maybe it has changed? Anyways, DC recommends 1.5 cubes ported, and the displacement on the sub is 0.18, which would make the final internal volume at 1.57 if I'm not mistaken...would this .07 make a huge difference? What should I measure/take pictures of? I can take pics of the inside of the box, and the port and whatever else...maybe that would help determine if there is a design flaw or other reason why I'm experiencing this? I have heard people talking about "sloppy fart bass" and I always thought that was what I wanted, as bass is bass to me, but now I think I understand what they were talking about, and it's unnacceptable. [/QUOTE]
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