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Message: <blockquote data-quote="n2audio" data-source="post: 8683038" data-attributes="member: 540940">box rise refers to the impedance of the sub due to the inherent nature of operation at various frequencies in a particular box.If you have a 2 ohm sub the actual impedance as "seen" by the amp will rarely, if ever be 2 ohms.I pulled up an impedance plot for an RF P3 at 2 ohms -- in an average size sealed box it peaks at 14.5 ohms at 42 hz, and is above 4 ohms from ~25-55hz. Ported runs a little lower, but is only close to 2 ohms at 30 and 70 hz.Cabin gain refers to the fact that lower frequencies are louder in a car than higher frequencies.  It has to do with the relatively small space vs relatively long wavelengths of low frequency sounds.</blockquote>

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