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<blockquote data-quote="DarkFox" data-source="post: 1758759" data-attributes="member: 567531">considering the music is being played through the coil of the sub this should be observed...A subwoofer is a fixed magnet with a coil in the middle of it.The coil is supplied with power from the amp. Creating a Electro-magnetic fieldThe &quot;Music&quot; is a AC sine wave.&nbsp; Meaning that the polarity on the coil changes with every 1/2 cycle at any given freq.If your sub only moves one way then you are giving it DC.So end result is how do you figure it only moves in or out?&nbsp; If you are hearing sound then it is moving both ways.&nbsp; Maybe you are just seeing alot more of the excursion (sp?)If you have a multi meter you can set it to DC Volts and parallel it to your sub.&nbsp; You should read 0 V dc, (or within a few hundred mV anyway.)&nbsp; If you hear music AND have a few volts DC then there is a problem with your amp, and from a electro-mechanical stand point it would be the equivilent of a AC sine wave riding a elivated DC signal.&nbsp; All in theroy of coarse.&nbsp; J/L</blockquote>

[QUOTE="DarkFox, post: 1758759, member: 567531"] considering the music is being played through the coil of the sub this should be observed... A subwoofer is a fixed magnet with a coil in the middle of it. The coil is supplied with power from the amp. Creating a Electro-magnetic field The "Music" is a AC sine wave. Meaning that the polarity on the coil changes with every 1/2 cycle at any given freq. If your sub only moves one way then you are giving it DC. So end result is how do you figure it only moves in or out? If you are hearing sound then it is moving both ways. Maybe you are just seeing alot more of the excursion (sp?) If you have a multi meter you can set it to DC Volts and parallel it to your sub. You should read 0 V dc, (or within a few hundred mV anyway.) If you hear music AND have a few volts DC then there is a problem with your amp, and from a electro-mechanical stand point it would be the equivilent of a AC sine wave riding a elivated DC signal. All in theroy of coarse. J/L [/QUOTE]

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