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Old 8th February 2010, 06:34 AM   #11
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Join Date: Feb 2008
Location: Sheffield
Originally Posted by Don Hills View Post
The inductance change will not significantly affect the VC current. VC inductance is only significant at high frequencies, usually above the operating range of the driver. At low frequencies, the VC current is set by two factors:

1- The DC resistance of the voice coil.
2- The impedance peaks at the system resonance(s).

Most bass driver systems (driver/enclosure) are designed to be excursion limited, not power limited. That is, in most cases, at the lowest frequencies the driver will reach its excursion limits before reaching its heat limits.

For the current scenario, I guess we wait for the results of the failed driver post-mortem examination to decide the cause.
You haven't accounted for the changes of impedance when the cone actually moves somewhere.
Get a meter, put it across a woofer. Push the cone in (or out).

My work: www.grimshawaudio.com
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