Crown Audio 180MA 280MA Welcome, Commercial Audio Series Mixer-Amplifiers, page, I. Power Switch

Commercial Audio Series Mixer-Amplifiers

1 Welcome

1.2 Front Panel Controls and Indicators

A. Input Signal Presence Indicator

Green LED, one for each input channel, illuminates when input signal exceeds –24 dBu (line) or –70 dBu (mic).

B. Input Volume Controls

Microphone/line, four in 180MA and 1160MA, eight in 280MA. Detented potentiometers with knobs.

C. Output Volume Controls

One per output channel. Detented potentiometer with knob.

D. Output Signal Presence Indicator

Green LED, one for each output channel, illuminates when output signal level exceeds 100 mV (45 dB below full power) from the 4-ohm tap. Does not respond to sig- nals from the AMP INPUT connector.

E. Clip Indicator

Red LED, one per output channel, illuminates at thresh- old of audible distortion. Does not respond to signals from the AMP INPUT connector.

F. Power Indicator

Blue LED indicates power on.

G, H. Tone Controls

Bass and Treble non-detented potentiometers on each input channel. Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.

I. Power Switch

Pushbutton on-off switch. The power switch does not affect the 24V DC auxiliary power input (letter “K” on next page).

Figure 1.1 Front Panel Controls and Indicators

page 6 Operation Manual