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<blockquote data-quote="hispls" data-source="post: 8155422" data-attributes="member: 614752">The chamber without a driver in it should be ported as well.&nbsp; It&#039;s called an ABC box commonly but there&#039;s a couple other names for it.&nbsp;&nbsp; When done correctly the chambers are 1/3 and 2/3 of the total volume and ALL ports are equal size and length.&nbsp;&nbsp; You tune the ports so that the full box volume is tuned to your low frequency with 2 identical ports.The smaller side of the box will peak much higher and below that the port between chambers unloads so that the rest of the box volume and that port becomes loaded... you essentially get 2 peaks.&nbsp;&nbsp; They sound really nice and can get some impressive response out of small cone area, but they&#039;re tricky to build and rather picky about getting everything right.&nbsp;&nbsp; Also they take up a lot of space.<a href="http:////forums/general-discussion/567204-pics-current-abc-box-aperiodic-bi-chamber-dual-tuned-reflex.html" target="_blank">http://www.caraudio.com/forums/general-discussion/567204-pics-current-abc-box-aperiodic-bi-chamber-dual-tuned-reflex.html</a>Very good picture of one done right.&nbsp; There&#039;s a huge thread in Termlab forum archives on this style box.&nbsp; Some searching may find it.</blockquote>

[QUOTE="hispls, post: 8155422, member: 614752"] The chamber without a driver in it should be ported as well. It's called an ABC box commonly but there's a couple other names for it. When done correctly the chambers are 1/3 and 2/3 of the total volume and ALL ports are equal size and length. You tune the ports so that the full box volume is tuned to your low frequency with 2 identical ports. The smaller side of the box will peak much higher and below that the port between chambers unloads so that the rest of the box volume and that port becomes loaded... you essentially get 2 peaks. They sound really nice and can get some impressive response out of small cone area, but they're tricky to build and rather picky about getting everything right. Also they take up a lot of space. [URL="http:////forums/general-discussion/567204-pics-current-abc-box-aperiodic-bi-chamber-dual-tuned-reflex.html"]http://www.caraudio.com/forums/general-discussion/567204-pics-current-abc-box-aperiodic-bi-chamber-dual-tuned-reflex.html[/URL] Very good picture of one done right. There's a huge thread in Termlab forum archives on this style box. Some searching may find it. [/QUOTE]

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