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<blockquote data-quote="bbeljefe" data-source="post: 8184540" data-attributes="member: 655960">If you&#039;re in it for SQ in a vehicle you don&#039;t need that much cone area. Sound quality means that the bass isn&#039;t 4 times louder than the rest of the frequency range and that can be accomplished with one 10 in a vehicle cabin.Now, if you&#039;re actually interested in enhanced bass, then two 15s or one 18 make sense. I&#039;d go with the Sundown subs but that&#039;s just preference.As for sealed bass being quicker... no it isn&#039;t. A 30 Hz sound wave is ~37.5 feet long at the speed of sound and if you speed it up, it&#039;s no longer a 30 Hz tone. Likewise if you slow it down. This whole idea that sealed boxes sound better is as subjective as your preference for ice cream flavors as opposed to mine. If you like flat response from your subs then a sealed box will be fine. If you like them loud, then ported or some other alignment would be better.But in the end, a properly designed ported box will be as &quot;quick&quot; and &quot;tight&quot; as any sealed box and, it will always be capable of more sound pressure. Likewise, a t-line will be even better than a conventionally ported enclosure.As for choosing which sub to buy, I would first decide what sort of enclosure I wanted and then make sure I had room for it. After that, I&#039;d choose a sub that will perform well in the enclosure style I&#039;ve chosen and then... I&#039;d build it and start beating. ;-)If you choose sealed or 4th order, look for a low EBP sub and if you choose any other vented alignment, look for a high EBP sub. If the manufacturer doesn&#039;t list EBP, simply divide Fs by Qes and that&#039;s the EBP. Generally speaking ,below 50 low, 50-90 is mid and above 90 is high... although I would say that anything below 60 is low.As for mixing sub sizes, you can do it if you like but just don&#039;t put different sized subs in the same chamber.</blockquote>

[QUOTE="bbeljefe, post: 8184540, member: 655960"] If you're in it for SQ in a vehicle you don't need that much cone area. Sound quality means that the bass isn't 4 times louder than the rest of the frequency range and that can be accomplished with one 10 in a vehicle cabin. Now, if you're actually interested in enhanced bass, then two 15s or one 18 make sense. I'd go with the Sundown subs but that's just preference. As for sealed bass being quicker... no it isn't. A 30 Hz sound wave is ~37.5 feet long at the speed of sound and if you speed it up, it's no longer a 30 Hz tone. Likewise if you slow it down. This whole idea that sealed boxes sound better is as subjective as your preference for ice cream flavors as opposed to mine. If you like flat response from your subs then a sealed box will be fine. If you like them loud, then ported or some other alignment would be better. But in the end, a properly designed ported box will be as "quick" and "tight" as any sealed box and, it will always be capable of more sound pressure. Likewise, a t-line will be even better than a conventionally ported enclosure. As for choosing which sub to buy, I would first decide what sort of enclosure I wanted and then make sure I had room for it. After that, I'd choose a sub that will perform well in the enclosure style I've chosen and then... I'd build it and start beating. ;-) If you choose sealed or 4th order, look for a low EBP sub and if you choose any other vented alignment, look for a high EBP sub. If the manufacturer doesn't list EBP, simply divide Fs by Qes and that's the EBP. Generally speaking ,below 50 low, 50-90 is mid and above 90 is high... although I would say that anything below 60 is low. As for mixing sub sizes, you can do it if you like but just don't put different sized subs in the same chamber. [/QUOTE]

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