4" Sandwich voice coil Fiberglass former DCSP Double Cross Konex Spider (DCS) with Progressive Waves TR Triple Roll Cloth surround TWpT Total Waterproof Cone Treatment HeF High Excursion Ferrite Magnet Circuit VMVc Ventilated Magnet and Voice Coil to reduce Power Compression 94.8 dB sensitivity Frequency Range 35-2000 Hz

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