Avid MBox. Microphone Signal-to-Noise Ratio (SNR): -110 dB, Line Signal-to-Noise Ratio (SNR): -110 dB, Frequency response: 20 - 20000 Hz. Input impedance: 20000 Ом, Microphone input impedance: 4400 Ом, Maximum input level: 3.55 V. Balanced line output level: 7.08 V