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<blockquote data-quote="T3mpest" data-source="post: 8186623" data-attributes="member: 560148">If it&#039;s a 12 in a sealed box a high sensativity is the last thing you&#039;d want.&nbsp; Hoffmans iron law, you can have a small box, or low end extension or sensativity, pick any 2, you lose the third.&nbsp; If a sub is effecient it will roll off faster due to the lower q and will need a big box, often ported to compensate.&nbsp; if you want low bass from a small sealed box you want the least effecient woofer you can find.&nbsp; You&#039;ll get less output at higher frequencies, but more down low.I just looked up this massive audio hippo as I&#039;ve seen a few references to it.&nbsp; I guess while I find the name silly most must like it as this thing is all marketing.&nbsp; It has a 34fs (not what the OP wanted) actual sensativity is 89db/1w/1m and it only has 15mm of xmax.&nbsp; Far from anything special in any category.&nbsp; For that money there are things that will kill it used and even new I think I&#039;d go with a SSA Gcon.&nbsp; The hippo is a 3inch coil, but 2000 watts RMS is a little much, I think the range is 500-2000 for a reason, without good cooling most 3inch coils dont&#039; like much over 1500.</blockquote>

[QUOTE="T3mpest, post: 8186623, member: 560148"] If it's a 12 in a sealed box a high sensativity is the last thing you'd want. Hoffmans iron law, you can have a small box, or low end extension or sensativity, pick any 2, you lose the third. If a sub is effecient it will roll off faster due to the lower q and will need a big box, often ported to compensate. if you want low bass from a small sealed box you want the least effecient woofer you can find. You'll get less output at higher frequencies, but more down low. I just looked up this massive audio hippo as I've seen a few references to it. I guess while I find the name silly most must like it as this thing is all marketing. It has a 34fs (not what the OP wanted) actual sensativity is 89db/1w/1m and it only has 15mm of xmax. Far from anything special in any category. For that money there are things that will kill it used and even new I think I'd go with a SSA Gcon. The hippo is a 3inch coil, but 2000 watts RMS is a little much, I think the range is 500-2000 for a reason, without good cooling most 3inch coils dont' like much over 1500. [/QUOTE]

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