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Anthony wrote:
 The driver has no baffle now and is just sitting on the floor with some pillows holding it upright....
except when it gets really low and the woofer bottoms out. |
No kidding
Without the restoring force of air that it would have if placed in an enclosure it has nothing but its suspension to control its excursion.
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Apparently the excursion really jumps at about 18 Hz.
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You have likely found the natural resonant frequency of the driver.You risk damaging your driver using it in this manner.