HelixNet | User Guide
20.1.2 Microphone Pre-Amplifier
Specification Description / value
Headset Mic impedance: 200Ω (Dynamic)
Headset Mic Voltage 1.7V (Electret selectable)
Limiter +23dB
The following specified for a route to 4-wire output @ 0dBu out
Mic gain 60dB (dynamic) 45dB (electret)
Frequency response 300Hz – 10kHz ± -3dB (contoured for intelligibility)
Distortion <0.2% THD @ 1kHz
Noise- <-55dBu dynamic, <-65dBu electret
20.1.3 Loudspeaker Amplifier
Specification Description / value
Load impedance 8Ω
Output level +18dBu before clipping
Max gain 18dB
The following specified for a route from a 4-wire input @ 0dBu in
Frequency response 200Hz - 10kHz ± 3dB
Distortion <1% THD @ 1 kHz
Noise <-50dBu
20.1.4 Program Audio Line Input
Specification Description / value
Maximum level before clipping 18dBu
Nominal input level 0dBu (selectable)
Input impedance >= 10KΩ
Routed to a 4-wire output @ 0dBu
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