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<blockquote data-quote="Jeffdachef" data-source="post: 8686528" data-attributes="member: 650438">you need to realize that sealed is only flat out on its own in an open space. Inside a car you are subjected to whatever cabin gain and resonant frequency that car peaks at. If you are lucky, i&#039;ll peak low and you get a flat response or it peaks in the middle and you get a semi linear response. However like most undeadened cars straight from factory, you&#039;ll be peaking high and you&#039;ll sound like an absolute fart box having an extremely high peak around 45 to 55hz, thats far from musically accurate its actually a major headache to listen to and you have absolutely no way to correct that.At least with a ported, 4th order, 6th order, 1/4 wave transmission line, passive radiator, horn loaded and aperiodic bi chamber boxes, you can tune accordingly to flatten out the frequency response. The perfect boxes could be any of those implemented correctly&nbsp; This is why I tell people that a real box builder would know to check the acoustics in the car and choose a proper box design based on the cabin gain. But literally everyone just looks at the sub recommended specs and builds a box blindly and get mediocre results but claim its a custom ported box... No thats a half as$ed box at best.</blockquote>

[QUOTE="Jeffdachef, post: 8686528, member: 650438"] you need to realize that sealed is only flat out on its own in an open space. Inside a car you are subjected to whatever cabin gain and resonant frequency that car peaks at. If you are lucky, i'll peak low and you get a flat response or it peaks in the middle and you get a semi linear response. However like most undeadened cars straight from factory, you'll be peaking high and you'll sound like an absolute fart box having an extremely high peak around 45 to 55hz, thats far from musically accurate its actually a major headache to listen to and you have absolutely no way to correct that. At least with a ported, 4th order, 6th order, 1/4 wave transmission line, passive radiator, horn loaded and aperiodic bi chamber boxes, you can tune accordingly to flatten out the frequency response. The perfect boxes could be any of those implemented correctly This is why I tell people that a real box builder would know to check the acoustics in the car and choose a proper box design based on the cabin gain. But literally everyone just looks at the sub recommended specs and builds a box blindly and get mediocre results but claim its a custom ported box... No thats a half as$ed box at best. [/QUOTE]

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