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Message: <blockquote data-quote="moparnut" data-source="post: 8626689" data-attributes="member: 674006">Which sub are you referring to?  If you are referring to the Fosgate, then yes I agree.  It went in there as a placeholder and had been replaced recently with a JL Audio 12W0 that I picked up for $40, which sounds pretty good.  The PPI by my calculations should work great.  The QTS should be something .40 and lower, which the PPI is .4 and the QMS should be lower than 7, which the PPI is 5.46.As for the port length, the Fs of the PPI is 29, which according to my math (1130/29 = 38.96 Ft long port for full sound wave, 38.96/4 = 9.74 ft long port for 1/4 wave Tline)The current port length of 7.5 ft tunes out to roughly 37-38 Hz.  The box really does come alive at that freq, but I want more lower end out of it.I ordered the PPI P.12D2 and it should be here Monday, so I'll find out soon enough.</blockquote>

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