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<blockquote data-quote="BrianChia" data-source="post: 4217395" data-attributes="member: 576132">Depends on the driver being used. Usually a sealed box is the only way to get a fairly flat in vehicle response from 20hz+. A ported box will typically suffer from a large peak in the 30hz range then drop off too rapidly below and above the tuning frequency. To get an accurate response curve you would want to avoid any peaks or dips. That being said, some drivers are suitable for ported boxes in the car when the goal is SQ. Usually the tuning will have to be fairly low (20-30hz) in order to maintain a flat response.The reason why you must usually tune low is because a woofer in a ported box behaves similar to a woofer in IB or free air above the tuning frequency. You want most of your bass to come from the woofer not the port (due to phasing and group delay issues which can &quot;muddy&quot; the sound). You only want the port to step in when the woofer begins to naturally roll off, increasing the low end extension.</blockquote>

[QUOTE="BrianChia, post: 4217395, member: 576132"] Depends on the driver being used. Usually a sealed box is the only way to get a fairly flat in vehicle response from 20hz+. A ported box will typically suffer from a large peak in the 30hz range then drop off too rapidly below and above the tuning frequency. To get an accurate response curve you would want to avoid any peaks or dips. That being said, some drivers are suitable for ported boxes in the car when the goal is SQ. Usually the tuning will have to be fairly low (20-30hz) in order to maintain a flat response. The reason why you must usually tune low is because a woofer in a ported box behaves similar to a woofer in IB or free air above the tuning frequency. You want most of your bass to come from the woofer not the port (due to phasing and group delay issues which can "muddy" the sound). You only want the port to step in when the woofer begins to naturally roll off, increasing the low end extension. [/QUOTE]

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