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Message: <blockquote data-quote="THATpurpleKUSH" data-source="post: 7752171" data-attributes="member: 615398">A subwoofer is a magnetic coil with an inductance. When you input AC current, impedance (or resistance on a DC circuit) varies depending on the frequency of the AC signal.A woofer has its own impedance rise at the Fs of the woofer. The amount of this rise is noted in ts parameters as 'Z'. Many people do not realize this and understand that the impendance they are calling "impedance rise" is actually there with the woofer out of the box. But that being said, putting the woofer in a box also creates additional impedance spikes due to the box resonance and the port tuning.For example, spl competitors wire ~.5ohms on a 1 ohm stable amp, know that they will rise to over 1 ohm with impedance rise, to get the most power out of their setup.</blockquote>

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