Yamaha STAGEPAS 250M Portable PA System and Keyboard Amp Frequency Response (Nominal output level @ 1 kHz): -3 dB, 0 dB, +1 dB @ 20 Hz-20 kHz, 1 W Output Total Harmonic Distortion: 0.5 % @ 20 Hz, 1 kHz, 20 kHz +14 dBu GAIN= nominal Hum & Noise (Equivalent Input Noise, Rs 150O, MIC/LINE = MIC): Less than or equal to sign-106 dBu (CH1/2), Less than or equal to sign-65 dBu Crosstalk (1 kHz): -70dB between input channels Power Consumption: 35 W