YD66M21-45P500

RYD YD66M21-45P500 is a φ66×20.5mm high-impedance loudspeaker rated at 45Ω, intended for industrial equipment, alarm circuits and medical alert systems. Rated input is 0.5W with 1.0W maximum, resonance 350Hz, effective range Fo~5kHz, sensitivity 83±3dB (1W/1m average), and distortion below 5%. High impedance allows many units to share a single amplifier line with stable current draw — a practical architecture for building alarm loops, multi-room call systems and distributed indication panels. Manufactured under the RYD ISO9001 quality system with RoHS compliant materials. Customization available: sensitivity, impedance values, connection style and waterproof or dustproof grade; new designs can be developed for volume programs. Contact RYD with your line configuration for matching advice.