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<blockquote data-quote="ciaonzo" data-source="post: 8654201" data-attributes="member: 607015">Re on each driver is 1.6, so .8 at the lowest point. Not at every frequency, obviously, but be sure the amp is seeing it somewhere above and below the impedance spike. Couple that with some nasty phase angles on the impedance spike and your amp will get plenty hot. You can read more about that under the &quot;Phase Angle&quot; portion of this link but this is the takeaway. &quot;So if the amplifier delivers 100 W of power to the speaker (at a 45 degree phase shift), it will heat up like it’s delivering 400 W.&quot;<a href="http://audiojudgement.com/speaker-impedance-curve-explained/" target="_blank">http://audiojudgement.com/speaker-impedance-curve-explained/</a>They don&#039;t always &quot;need&quot; all 1200w that they can handle. Better off to have the 1200-1400 on tap for headroom than to be constantly dumping it into these SQ drivers. You have to be careful with dumping lots of current into low BL drivers on the higher frequencies in the 40-50Hz region. Lots of current will flow but the coil is not moving enough to adequately cool itself.</blockquote>

[QUOTE="ciaonzo, post: 8654201, member: 607015"] Re on each driver is 1.6, so .8 at the lowest point. Not at every frequency, obviously, but be sure the amp is seeing it somewhere above and below the impedance spike. Couple that with some nasty phase angles on the impedance spike and your amp will get plenty hot. You can read more about that under the "Phase Angle" portion of this link but this is the takeaway. "[B]So if the amplifier delivers 100 W of power to the speaker (at a 45 degree phase shift), it will heat up like it’s delivering 400 W[/B]." [URL="http://audiojudgement.com/speaker-impedance-curve-explained/"]http://audiojudgement.com/speaker-impedance-curve-explained/[/URL] They don't always "need" all 1200w that they can handle. Better off to have the 1200-1400 on tap for headroom than to be constantly dumping it into these SQ drivers. You have to be careful with dumping lots of current into low BL drivers on the higher frequencies in the 40-50Hz region. Lots of current will flow but the coil is not moving enough to adequately cool itself. [/QUOTE]

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