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Enclosure Design & Construction
Subs -n- Ports Relationship
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<blockquote data-quote="Doxquzme" data-source="post: 8865075" data-attributes="member: 689267"><p>Not trying to hijack your feeds, but me again...</p><p></p><p>If you are placing the subwoofer such that the port faces any one of a nearby interior wall, the distance to the metal or hard object will affect (lower) the box tuning, as the small area in between the wall and the port effectively extends the port length. If the speaker and port are firing "at the same area" this won't be an issue.</p><p></p><p>There are a few other issues related to ports including integration of the sound from the port with the direct sound from the driver, chuffing (air turbulence creating noise when the port is working hard), and midrange coloration (undesirable higher frequency sounds escaping the port - high-frequency compared with the port tuning ie 100hz when the tuning is 20hz). Chuffing can be exacerbated by placement close to a hard interior surface, while pointing the port away from the listener tends to reduce midrange coloration (still not an issue in your other build).</p><p></p><p>These are all "best case" recommendations. In your other build, it's not an issue because the driver and the port will be on the same face into the cabin, no reflective surface near to cause an issue. In your truck, it may just be a luxury and one that is not available. In cases where you can't have the port on the same side, then the next best is on the opposite side, If that is not option, then wherever it can be is used.</p><p></p><p>Bass port acoustic coupling connects the internal volume of a bass reflex enclosure to the outside environment. This coupling creates a Helmholtz resonance at the lowest frequencies of the system. The port is an opening in the enclosure that is tuned to create specific resonances and coupling with the air outside. The port creates more output at low frequencies, allowing the speaker to produce lower frequencies better. </p><p></p><p>The port is usually installed on the same side as the woofer. If this is not possible, the port can be installed on the side or back of the enclosure. The opening of the port should not be blocked, and multiple ports should be positioned on the same side of the enclosure.</p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8865075, member: 689267"] Not trying to hijack your feeds, but me again... If you are placing the subwoofer such that the port faces any one of a nearby interior wall, the distance to the metal or hard object will affect (lower) the box tuning, as the small area in between the wall and the port effectively extends the port length. If the speaker and port are firing "at the same area" this won't be an issue. There are a few other issues related to ports including integration of the sound from the port with the direct sound from the driver, chuffing (air turbulence creating noise when the port is working hard), and midrange coloration (undesirable higher frequency sounds escaping the port - high-frequency compared with the port tuning ie 100hz when the tuning is 20hz). Chuffing can be exacerbated by placement close to a hard interior surface, while pointing the port away from the listener tends to reduce midrange coloration (still not an issue in your other build). These are all "best case" recommendations. In your other build, it's not an issue because the driver and the port will be on the same face into the cabin, no reflective surface near to cause an issue. In your truck, it may just be a luxury and one that is not available. In cases where you can't have the port on the same side, then the next best is on the opposite side, If that is not option, then wherever it can be is used. Bass port acoustic coupling connects the internal volume of a bass reflex enclosure to the outside environment. This coupling creates a Helmholtz resonance at the lowest frequencies of the system. The port is an opening in the enclosure that is tuned to create specific resonances and coupling with the air outside. The port creates more output at low frequencies, allowing the speaker to produce lower frequencies better. The port is usually installed on the same side as the woofer. If this is not possible, the port can be installed on the side or back of the enclosure. The opening of the port should not be blocked, and multiple ports should be positioned on the same side of the enclosure. [/QUOTE]
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