Technology / Home Audio / Bumped and Vented: See discussion of Bumped above. Many higher power speakers have a vent hole in the center Pole Piece of the magnet. When viewed from the back, there is usually a screen over the hole to prevent debris or particles from falling into the voice coil gap. But it does allow for greater ventilation of the motor section, and this in turn provides for higher power inputs by permitting greater heat dissipation for the voice coil assembly.
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