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Gikfun 4Ohm 40Mm Diameter 3W Full Range Audio Speaker Stereo Woofer Loudspeaker For Arduino (Pack Of 2Pcs) Ek1794Specification: Impedance:4Ohm Power:3W Diameter:40mm Height:20mmnominal impedance : 4O15%resonance frequency : 320Hz20characteristic sensitivity of loudspeaker : 833dBinput-power rating : 2Wrated frequency range : 0-20KHzdistortion facto..