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1w 8 ohm speaker / speaker diameter 50mm Category: electric expression (moving coil) Shape: Round Uses: PA Magnetic forms: inner magnetic Frequency Characteristics: alto (IF) Rated impedance: 8 () Noise ratio: 1 (dB) Rated Power: 1 (W) Frequency response: 170 (kHz) The sensitivity: 100 (dB / W) Harmonic distortion: 1 (TMD%)