EFC Media Center Training Class 2A

Sound Input Levels Microphone Level Signals Line Level Signals Speaker Level Signals Balanced Inputs Stereo Inputs

Sound Input Levels Microphone Level Signals –100 micro Volts –From microphone –From guitar pickup

Sound Input Levels Guitar Pickup

Sound Input Levels Line Level – 100 millivolts to few volts – Most signal sources except microphone Consumer electronics –Nominal Ref. -10dBV (0V reference, 1mW into 1K ohm) –0dB on indicator means 0.100V rms Professional electronics –Nominal +4dBu (0.7746V reference, 1mW into 600 ohm) –0dB on indicator means 1.945V rms –About 13dB larger than consumer signals

Sound Input Levels Speaker Level –Larger than 40Volts –Drive Speaker loads of few ohms –NEVER connect this signal to any electronics other than speakers