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<blockquote data-quote="Buck" data-source="post: 8764788" data-attributes="member: 591582">I was looking over this again.&nbsp; The cool thing is that this box will work without the front port in, and it could be burped that way.&nbsp; These DC&#039;s being 4500w rms a piece allowed me to make a huge front chamber.&nbsp; DC&#039;s might like small boxes, but they also have some of the highest port speeds that I&#039;ve seen, which means they really move air.&nbsp; Those 4 15&#039;s should have no problem pressurizing that larger chamber, especially with how I tuned the rear and front.&nbsp; That front chamber isn&#039;t really just an extra chamber; it&#039;s truly tuned to have quite an impact both relative to it&#039;s tuning and the gain from such a large chamber and large front port.&nbsp; With lower power woofers, I&#039;m not sure if I would make the front chamber as large as it is.&nbsp; Even the rear port on this box is quite large, as far as port area goes.&nbsp; There&#039;s only so big on port you can go until you run into port resonance issues, which series 6th orders help with.&nbsp; Ports can only be so long before they start acting like t-lines.&nbsp; One of the main reason of doing a series 6th is the port resonance issue.&nbsp; If you want to play stupid lows at high pressure, a series 6th order is a great way to do it.&nbsp; DC&#039;s want such big port area, and that makes the port wayyyyy longer than subs that can use little tiny ports.&nbsp; Once you get below 28 hz or so, port lengths just become RIDICULOUSLY long.&nbsp; Gotta watch out for those port resonances on very high powered and very low tuned enclosures.</blockquote>

[QUOTE="Buck, post: 8764788, member: 591582"] I was looking over this again. The cool thing is that this box will work without the front port in, and it could be burped that way. These DC's being 4500w rms a piece allowed me to make a huge front chamber. DC's might like small boxes, but they also have some of the highest port speeds that I've seen, which means they really move air. Those 4 15's should have no problem pressurizing that larger chamber, especially with how I tuned the rear and front. That front chamber isn't really just an extra chamber; it's truly tuned to have quite an impact both relative to it's tuning and the gain from such a large chamber and large front port. With lower power woofers, I'm not sure if I would make the front chamber as large as it is. Even the rear port on this box is quite large, as far as port area goes. There's only so big on port you can go until you run into port resonance issues, which series 6th orders help with. Ports can only be so long before they start acting like t-lines. One of the main reason of doing a series 6th is the port resonance issue. If you want to play stupid lows at high pressure, a series 6th order is a great way to do it. DC's want such big port area, and that makes the port wayyyyy longer than subs that can use little tiny ports. Once you get below 28 hz or so, port lengths just become RIDICULOUSLY long. Gotta watch out for those port resonances on very high powered and very low tuned enclosures. [/QUOTE]

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