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The SR-252S basic specs are: Frequency response: DC-35 KHz (limits unspecified) Rated input level: 125mV Gain: 58dB. Harmonic distortion: 0.01% or less (at 10.0Vr.m.s. at 1kHz output). Input impedance: 50kΩ(RCA). Input terminal: RCA×2. Maximum Output voltage: 28.0Vr.m.s./1kHz. Standard bias voltage: 580V DC. Power consumption: 4W.Dimension:132 mm [5.2”](W) × 38 mm [1.5”](H) × 132 mm [5.2”](D) (protruding portion (feet, RCA jacks and volume knob) not included).Weight:540g (1.19 pounds).