Dust protection cap

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The dust protection cap is a cover that protects the voice coil of a loudspeaker , located directly below in the air gap of the magnet, from dirt and dust so that it cannot be jammed or slowed down. The dust protection cap is often made of aluminum or another material with good thermal conductivity, so that the heat generated by the voice coil is better dissipated into the surrounding air. The dust protection cap has the three functions of dust protection, heat conduction and damping at high frequencies.

Depending on the design, the area of ​​the dust protection cap can make up a considerable proportion of the vibration membrane . At high frequencies, not all parts of the cone vibrate in phase. This effect can be reduced by strongly damping the membrane. In this case, the moving part of the membrane continues to decrease with increasing frequency until only the dome is still vibrating and, as the frequency continues to increase, divides into differently vibrating areas. The dome can therefore make a significant contribution to radiating high frequencies, some tweeters only have a dome as a membrane. The frequency-dependent reduction of the membrane area by construction can serve to reduce the effects of bundling.

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