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Audio inputs

In advanced mode (SETUP), select AUDIO INPUT from the side menu.
Each input has the following controls: 542 Web Inputs Pn

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Gain (GAIN)

  • Adjusts the input signal level within a range of ±14 dB.
  • For analog inputs, 0 dB corresponds to +4 dBu, referenced to -18 dBfs (AES K18).
    This provides 18 dB of headroom.
Gain should be adjusted so that 0 VU peaks at the console oscillate between -22 and -9 dBfs on the processor’s level meter.

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Trim R

  • Gain compensation for the right channel.
  • Adjustment range: ±3 dB.
  • Allows correction of channel imbalances.

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ST/MONO

  • Switches the input between:
    • STEREO
    • MONO (sum of left and right channels).

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Main and alternative inputs

The 542APC automatically switches between inputs based on signal presence or absence.
  • A main input is defined.
  • Up to two alternative inputs can be configured (FAIL BACKUP 1 and 2).
  • The unit switches in this order:
    1. Main input
    2. FAIL BACKUP 1
    3. FAIL BACKUP 2

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Switching parameters

  • LEVEL → threshold below which the signal is considered failed.
    • Adjustable between -45 and -80 dB (5 dB steps).
  • FAIL TIME → time in seconds that the signal must remain below the LEVEL threshold to trigger switching.

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Input filters

  • HI PASS (Chebyshev type)
    • Options: 0 (disabled), 20 Hz (factory default), 40 Hz, 60 Hz, 80 Hz.
    • Eliminates subsonic signals, typically picked up by microphones.
  • LOW PASS
    • Options: 15 kHz, 16 kHz, 20 kHz.
    • Can be disabled (None).

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Audio outputs

In advanced mode (SETUP), select AUDIO OUTPUT from the side menu. The processor has four audio outputs, each with independent level adjustment. 542 Web Outputs Pn
  1. Balanced analog output (XLR)
  2. Unbalanced analog output (RJ45)
  3. AES-3 digital output
  4. Ethernet streaming (AoIP)

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PRE-emphasis

All outputs feature pre-emphasis switching. When activated, the output includes the 50 uS or 75 uS emphasis curve, according to configuration. Pre-emphasized output is used in configurations where the exciter or transmitter applies de-emphasis to the input audio.

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Signal source switching

The RJ45 analog, AES-3 digital, and AoIP outputs can be configured to send:
  • Processed signal.
  • Signal from the FM receiver.
When an output transmits the FM receiver signal, the output level reflects the actual on-air level, assuming: Modulation = 100%; FM Receiver input gain = 0 dB.