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<blockquote data-quote="Doxquzme" data-source="post: 8854987" data-attributes="member: 689267"><p>That happens. I had a $1000 dollar FOCAL where the magnet shifted and froze the coil. I returned it as you can’t know what the condition of the coils is after such a thing. If the coil is no longer rubbing you may be lucky if it is no longer an issue. That said, if enough rubbing occurred to damage the windings, that may have created a condition where it shorts out intermittently, this could cause the amplifier to fail if no voltage or short protection is present. Have you had the woofer tested, do you have a way to test the continuity of the woofer coil with your own equipment (A millimeter)? Try testing the woofer with a common household flashlight battery (or any C,D, AA,AAA). Hook up the driver voice coil leads to the battery maintaining polarity S(+) to B(+) and S(-) to B(-). The cone will move up and stay there if they are held in place. If they move up and then back down on either coil or don’t move at all, you most likely have a coil that has a short in it. Is this the first amp you hooked up the driver too?</p></blockquote><p></p>

[QUOTE="Doxquzme, post: 8854987, member: 689267"] That happens. I had a $1000 dollar FOCAL where the magnet shifted and froze the coil. I returned it as you can’t know what the condition of the coils is after such a thing. If the coil is no longer rubbing you may be lucky if it is no longer an issue. That said, if enough rubbing occurred to damage the windings, that may have created a condition where it shorts out intermittently, this could cause the amplifier to fail if no voltage or short protection is present. Have you had the woofer tested, do you have a way to test the continuity of the woofer coil with your own equipment (A millimeter)? Try testing the woofer with a common household flashlight battery (or any C,D, AA,AAA). Hook up the driver voice coil leads to the battery maintaining polarity S(+) to B(+) and S(-) to B(-). The cone will move up and stay there if they are held in place. If they move up and then back down on either coil or don’t move at all, you most likely have a coil that has a short in it. Is this the first amp you hooked up the driver too? [/QUOTE]

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