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<blockquote data-quote="helotaxi" data-source="post: 382977" data-attributes="member: 550915">You did it correctly.&nbsp; Don&#039;t worry.A speakers impedance is not linear over it&#039;s frequency range.&nbsp; Right around resonance it exhibits a sharp peak that maxes out at usually at least twice its nominal value.&nbsp; What you are referring to is called power compression.&nbsp; As the temp of the voice coil rises its resistance increases, but resistance and impedance are two different things.&nbsp; Resistance affects both AC and DC and is one component of impedance.&nbsp; Impedance only affects AC and is affected by the resistance and the coil moving in the motor gap thus its dependance on frequency.&nbsp; Impedance will rise with heat but it will be high at resonance from the very beginning.&nbsp; If you are going to wire your sub to .25 ohms and run the hell out of your amp, you must be very careful what frequencies you play.&nbsp; Before doing anything, I would be sure to run your speaker and enclosure through a program such as WINISD that will give you some idea of an impedance plot so you don&#039;t risk your amp.</blockquote>

[QUOTE="helotaxi, post: 382977, member: 550915"] You did it correctly. Don't worry. A speakers impedance is not linear over it's frequency range. Right around resonance it exhibits a sharp peak that maxes out at usually at least twice its nominal value. What you are referring to is called power compression. As the temp of the voice coil rises its resistance increases, but resistance and impedance are two different things. Resistance affects both AC and DC and is one component of impedance. Impedance only affects AC and is affected by the resistance and the coil moving in the motor gap thus its dependance on frequency. Impedance will rise with heat but it will be high at resonance from the very beginning. If you are going to wire your sub to .25 ohms and run the hell out of your amp, you must be very careful what frequencies you play. Before doing anything, I would be sure to run your speaker and enclosure through a program such as WINISD that will give you some idea of an impedance plot so you don't risk your amp. [/QUOTE]

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