Countryman ISOMAX 4RF

Output Impedance: 270 Ohms balanced, transformerless. Will drive any load impedance without distortion at full rated SPL.
Overload Sound Level: 124 dB SPL at 1% THD
Power Requirements: 9 V to 50 V at 10 mA
Sensitivity: 5.0 mV/Pascal
Equivalent Acoustic Noise: 39 dBA SPL

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