Performance
Frequency Response (at line out): 20 Hz to 20 kHz +/- 1 dB.
Signal to Noise Ratio (master volume at minimum): 100 dB.
THD: 0.05% typical with 800 mV balanced input, 1V output.
Input Sensitivity (volts RMS for full output at
maximum gain):
Balanced mic inputs: 3 mV.
Balanced line inputs: 800 mV.
RCA connectors: 400 mV.
Input Impedance (nominal):
Mic: 400 ohms.
Line: 100 kilohms.
RCA: 50 kilohms.
Crosstalk (all controls at “10”): –50 dB at 1kHz.
Line Output Level (nominal): 1.2 V into 10 kilohms.
Phantom Power: 15 VDC.
AC Line Voltages Available:
100V 50/60 Hz
120V 60 Hz
220V 50/60 Hz
230V 50/60 Hz
240V 50/60 Hz
Operating Temperature/Humidity: 0° C to 40° C at 95% relative humidity (non-condensing).
Storage Temperature: –20° C to 85° C.
Front Panel Controls and Indicators
Power Switch: Pushbutton on-off switch. The power switch does not affect the 24V DC auxiliary power input.
Input Volume Controls: Microphone/line, four in 14M, eight in 28M. Detented potentiometers with knobs.
Tone Controls: Bass and Treble non-detented potentiometers on each input channel. Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.
Power Indicator: Blue LED indicates power on.
Input Signal Presence Indicator: Green LED, one for each input channel, illuminates when input
signal exceeds –24 dBu (line) or –70 dBu (mic).
Output Signal Presence Indicator: Green LED, one for each output channel, illuminates when output signal level exceeds 100 mV.
Clip Indicators: Red LED, one per output channel. Illuminates at threshold of audible distortion.
Output Volume Controls: One per output channel. Detented potentiometer with knob.
Back Panel Controls and Connectors
Fuse: Protects the power supply.
AC Power Inlet: Detachable IEC.
Auxiliary Power Input: 2-position terminal strip for 24 VDC (±10%) backup power. Accepts up to 10 AWG terminal forks.
Mixer Config Switch: A DIP switch with two functions:
1. Assigns an input as the priority input for each output, thereby temporarily muting the remaining
inputs. Muting is activated by contact closure.
2. Global enable switch for phantom power. Does not affect RCA inputs. Default position is off.
Priority Connector: 3-pin Phoenix-type connector allows Input 1 or Input 5 (28M only) to mute other input signals by contact closure.
Input Routing Switch (28M only): DIP switches that assign each input signal to each output. Two switches per input.
Line Out Connector: One 3-pin balanced Phoenixtype connector per output channel. Level controlled by master volume control.
Tone Generator Connector: 5-pin Phoenix-type connector. Tones include Pre-Announce Chime, Bell, Alert Tone, and Evacuate Tone. All tones are activated by contact closures on the connector.
Tone Level: One potentiometer per output channel sets the volume of the tones. Tone level is not affected by output volume controls.
Input Connectors:
Mic/Line Connector: 3-pin Phoenix-type, balanced, one per input channel.
Dual RCA Input Connector: For stereo music signals, unbalanced, summed together, two connectors per input channel.
Mic/line Switch: Selects mic-level or line-level signals. One switch for each balanced input.
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