dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS.
Channels
Four intercom channels
Program Audio (Assignable to intercom channels)
Connectors
Intercom Line: (2) 3-pin XLRM-F loop thru
Headset: 4-pin XLR–M
USB: Type A & Micro AB
Program: 3-pin XLR–F
SA (Stage Announce): 3-pin XLR–M
Hot Mic / IFB Interface: 1/4" (0.64 cm) phone jack
GPI: 25 way D-type female
Microphone Pre-amplifier
Headset Mic Impedance: 200Ω (Dynamic)
Headset Mic Voltage: 1.7V (Electret selectable)
Limiter: +23dB
The following specified for a route to four-wire output at 0dBu out:
Mic Gain: 60dB (Dynamic), 45dB (Electret)
Frequency Response: 300Hz – 10 kHz ±3dB
Contoured for Intelligibility
Distortion: <0.2% THD @ 1kHz
Noise: <-55dBu (Dynamic), <-65dBu (Electret)
Headphone Amplifier
Load Impedance: >32Ω
Output Level: +12dBu before clipping
Sidetone: -12dBu (selectable)
The following specified for a route from a four-wire input at 0dBu in:
Max Gain: 0dB
Frequency Response: 40Hz - 10kHz ±3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-65dBu
Headphone Limiter: 0dBu (selectable)
Loudspeaker Amplifier
Load Impedance: 8Ω
Output Level: +18dBu before clipping
The following specified for a route from a four-wire intput at 0dBu in:
Max Gain: 18dB
Frequency Response: 200Hz - 10kHz ±3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-50dBu
Program Line Input
Maximum Level Before Clipping: 18dBu
Nominal Input Level: 0dBu (selectable)
Input Impedance: >= 10KΩ
The following specified for a route to four-wire output at 0dBu out:
Frequency Response: 20Hz - 10kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-65dBu
Stage Announcer Output
Maximum Level Before Clipping: 18dBu
Nominal Output Level: 0dBu (selectable)
Output Impedance: <= 100Ω
The following specified for a route from a dynamic headset:
Frequency Response: 300Hz - 12kHz ±3dB
Distortion: <0.1% THD @ 1kHz
Noise: <-55dBu
Hot Mic Output
Maximum Level Before Clipping: 12dBu
Nominal Output Level: 0dBu (selectable)
Output Impedance: <= 100Ω
The following specified for a route from a dynamic headset:
Frequency Response: 300Hz - 12kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-55dBu
Main PowerInput Voltage Range: 100 - 240VACInput Frequency Range: 50 - 60HzInput Power: <= 250VACOutput Voltage: +/-29VDC ± 1VOutput Current per Channel: 1.5A (continuous)Power Connector: IEC60320-1-C14EnvironmentalMax temperature is 40ºC (104ºF)0 - 90% relative humidityDimensions19" W x 1.75" H x 13" D (483mm x 44mm x 320mm)Weight5.83 lbs (2.65 kg)