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PCM 81 User Guide
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Installation Notes
Mounting
The PCM 81 is equipped with a 3-pin IEC power connector and detachable cord.
The PCM 81 will operate with power sources from 100 to 240 volts AC, 50-60Hz.
Power switching to actual line voltage is automatic.
Power Requirements
Audio Connections
Analog Audio
For best performance, maintain balanced connections, and use high-quality,
low-capacitance, twisted-shielded pair cable.
When connecting to single-ended, unbalanced devices, connect the low side to
signal ground at the unbalanced piece of equipment. Output level does not
change when connected to an unbalanced input.
Mono Applications
Use a Y-connector inserted at the analog inputs and outputs to have the signal
summed to mono.
NOTE
Be careful to keep input and output to all channels wired consistently. Out-of-
phase wiring can produce audible effects.
Digital Audio
S/PDIF (CP-340 Type II) Consumer Digital Audio connections require 75Ω
coaxial cable suited for digital audio or video signals. Audio grade cable is not
suitable.
AES/EBU connections require balanced connections using high-quality, low-
capacitance, controlled-impedance, data communication, twisted-shielded pair
cable. Microphone cable may introduce a significant amount of jitter into
the signal, causing distortion.
The PCM 81 uses one EIA-standard rack space, and can be mounted on any
level surface or in a standard 19 inch (483 mm) rack. If the PCM 81 is mounted
in a rack or road case, support the rear of the chassis to prevent possible
damage from mechanical shock and vibration.
The maximum ambient operating temperature is 104°F (40°C). Provide ade-
quate ventilation if the PCM 81 is mounted in a closed rack with heat-producing
equipment such as power amplifiers.
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