Outputs: Banana binding post, Speakon, 1/4'. Precise LED meters signal and clip and protect indicators to monitor performance. "CAF" (Complete Air Flow) ventilation system with automatic variable-speed fan for smooth and quiet operation. High-quality components and exceptionally rugged construction ensure long life and quality performance. Frequency Response: 20Hz-20kHz ±1 dB.Signal to Noise Ratio: -105 dB unweighted 20Hz-20kHz. Input Impedance: 20 kohm balanced/ 10 kohm unbalanced.