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<blockquote data-quote="bbeljefe" data-source="post: 8157197" data-attributes="member: 655960"><p>With IB and t-line boxes, you need a sub with low compliance, as there is little to no acoustical suspension for the driver. The benefit is wider bandwidth with no port noise. Bass reflex allows for acoustical gain but can suffer from port noise and the danger of unloading below Fs and Fb. Bandpass allows for even more acoustical gain than bass reflex but they roll off steeper and have a narrow bandwidth. Bandpass boxes are great for getting loud at a certain frequency but aren&#039;t usually good for sound quality. Also, it&#039;s difficult to hear a woofer bottom out when it&#039;s inside a box that&#039;s inside a box, so when that happens, the results aren&#039;t often noticed until the smoke leaves the port(s). Sealed boxes provide excellent acoustical suspension and increased power handling for the driver and they provide tight, clean bass but they do not create any acoustical gain so they&#039;re not good for SPL.</p></blockquote><p></p>

[QUOTE="bbeljefe, post: 8157197, member: 655960"] With IB and t-line boxes, you need a sub with low compliance, as there is little to no acoustical suspension for the driver. The benefit is wider bandwidth with no port noise. Bass reflex allows for acoustical gain but can suffer from port noise and the danger of unloading below Fs and Fb. Bandpass allows for even more acoustical gain than bass reflex but they roll off steeper and have a narrow bandwidth. Bandpass boxes are great for getting loud at a certain frequency but aren't usually good for sound quality. Also, it's difficult to hear a woofer bottom out when it's inside a box that's inside a box, so when that happens, the results aren't often noticed until the smoke leaves the port(s). Sealed boxes provide excellent acoustical suspension and increased power handling for the driver and they provide tight, clean bass but they do not create any acoustical gain so they're not good for SPL. [/QUOTE]

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