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<blockquote data-quote="Danometal" data-source="post: 7963809" data-attributes="member: 636337">Another difference in sealed vs. ported, aside from the output gain with ported, is the frequency response curve. I&#039;m in the minority here, as I like to tune in the 20s, but most here tune in the mid 30s, which causes a hard peak around 40-50 hz, and a steep roll off below that, causing the lows to suffer greatly (the severity of this behavior varies from sub to sub). To my ears, this sounds like yesterday&#039;s trash as far as SQ goes. Been there. Done that.Sealed has a roll off that starts much higher, but it&#039;s not near as steep. Often the cabin gain of a vehicle meshes well with the gradual roll off of a sealed sub and sounds fairly flat, thus the common reputation of sealed subs for SQ applications. However, I contend that a very low tuned ported design actually sounds superior to its sealed counterpart.BTW, I love Polk&#039;s DXI line. Great speakers.</blockquote>

[QUOTE="Danometal, post: 7963809, member: 636337"] Another difference in sealed vs. ported, aside from the output gain with ported, is the frequency response curve. I'm in the minority here, as I like to tune in the 20s, but most here tune in the mid 30s, which causes a hard peak around 40-50 hz, and a steep roll off below that, causing the lows to suffer greatly (the severity of this behavior varies from sub to sub). To my ears, this sounds like yesterday's trash as far as SQ goes. Been there. Done that. Sealed has a roll off that starts much higher, but it's not near as steep. Often the cabin gain of a vehicle meshes well with the gradual roll off of a sealed sub and sounds fairly flat, thus the common reputation of sealed subs for SQ applications. However, I contend that a very low tuned ported design actually sounds superior to its sealed counterpart. BTW, I love Polk's DXI line. Great speakers. [/QUOTE]

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