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Message: <blockquote data-quote="Jeffdachef" data-source="post: 8721178" data-attributes="member: 650438">Get the soundqubed 4500 if you are running half ohm.  If you still arent loud enough then its an enclosure design issue. Throwing power at the sub is not the way to solve problems because if you cant get loud on low power, throwing more power is not gonna get you that much louder.  Whats the enclosure like and how is it positioned in the vehicle?   From my last modeling of the HDX series for their 18s, you dont get any real performance until you have it in an 8.25 cubic foot box tuned to 26 to 32hz. They seem to like a lot more airspace than the old generation HDC series which only needed 5.5 to 6.0 cubes for the 18s.So the 12s would need 2.75 to 3 cubes and 15s around 5.5 to 6 cubes.</blockquote>

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