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RE: Observable Woofer Cone Movement

If your woofer is visibly moving slow enough to see, it is because there are ultra low frequencies present in the music, which are undesirable and unnecessary. Normally, you don't see the woofer moving at the lowest audio frequencies because it would be moving too fast to be more than a blur. However, if the source is a vinyl record played on a turntable, this often results in the visible movement you are describing. You can eliminate this by using a high-pass rumble filter. Another way to eliminate this problem with vinyl is to buy speaker with acoustic suspension woofers. That's what I do because anytime you observe woofer pumping, it will always be causing increased intermodulation distortion, which is undesirable.

Good luck,
John Elison

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