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Analog Audio Connections

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XLR Inputs and Outputs

The 542APC features:
  • Balanced analog inputs (XLR connector, transformerless).
  • Balanced analog stereo outputs (XLR connector).
Connection follows professional audio standards.
Connection TypePin 1Pin 2Pin 3
Balanced InputGroundPositive phaseNegative phase
Unbalanced InputGround (join 1 & 3)Positive phaseTied to pin 1 at input
Unbalanced OutputGroundPositive phaseNo connection
Maintain correct phase in balanced connections.
Use two-conductor shielded cable, preferably with double shielding.
Keep cable lengths under 30 meters.
In special cases, it can be extended up to 100 meters, accepting slight high-frequency loss.

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RJ45 Inputs and Outputs

With the adoption of Audio over IP (AoIP), various manufacturers use RJ45 connectors and shielded multipair cable to standardize analog audio wiring.
  • One RJ45 connector carries two balanced lines, reducing equipment size and connector count.
  • Using structured cable (STP CAT5) for long distances simplifies installation and avoids soldering.
  • At the cable end, connection to devices may require standard audio connectors.
    For this, Solidyne provides RJ45-female → balanced connector adapters.
Solidyne devices are compatible with StudioHub® accessories widely used in broadcasting. More info: www.studiohub.com
Pin diagrams and adapter cables for cable assembly.

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Digital Audio Connections

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AES-3 Input / Output

  • When using digital input, it’s advisable to also connect analog inputs.
  • If signal is lost on any input, the processor automatically switches to the one with signal present.
The AES3 output is balanced and uses a male XLR connector.
PinSignal
1GND
2AES3 (1)
3AES3 (2)

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MPX Outputs

The 542APC features dual MPX output with independent level adjustment.
  • MPX connectors are BNC.
  • Use 75 Ohm coaxial cable (RG-59).
  • Keep cable length below 25 meters.
When connecting the transmitter with MPX signal, ensure to disable the internal pre-emphasis of the transmitter (flat response 20 – 100 kHz). Pre-emphasis is set in the 542APC (50 or 75 µs).
Maintaining proper ground distribution is important.
If in doubt, consult Solidyne indicating the equipment and grounding scheme used.