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ScanSpeak Discovery R2604/8330 Tweeter Dual Ring Radiator Dual Ring Radiator Diaphragm (Patented) Wave-guide center plug (Patented) Extended frequency to above 40kHz High Sensitivity – 92dB Low Resonance Frequency – 440Hz Low Distortion Double Magnet Rear Chamber Copper Clad Alu-wire The dual magnet version of the ring dome tweeter provides extra magnetic energy to increase the sensitivity and to extend the frequency response to above 40kHz.  The additional volume from the second magnet also increases the size of the chamber, lowering the resonance frequency.   This tweeter is an excellent choice for any high end home or automotive system.