Vu Meter; Vu Meter Switches; Power; Rear Panel Connections - Art Pro Channel User Manual

VU Meter

A backlit, average reading VU meter is provided to accurately monitor levels at several
points in the Pro Channel. The "0VU" level is calibrated to +4dBu at any of the internal
points, or at the ¼" Output connector. For the same calibration on the XLR output, a
600Ω load must be used, otherwise the Balanced Output is 6dB higher (0VU=+10dBu).
Note: When running the Pro Channel into a mixing console or recorder, always
reference the meter on the mixer or recorder when setting output levels. All meters are
not necessarily calibrated the same and it is always best to look at the level entering the
last piece of equipment in the chain.

VU Meter Switches

The VU Meter switches determine which point feeds the VU Meter circuit. The right-
hand switch selects either the Pro Channel's Output, or an internal point selected by the
other switch. The left-hand switch selects either the Preamp Output or the Compressor
Output.
Note: When the right-hand switch is set to Output, the left-hand switch has no effect.
Another Note: The internal level-monitoring points correspond to the level at the Send
jacks of the two insert loops. If you are using either one of these jacks as your output to
other devices in your chain, switch the VU Meter to monitor the appropriate point.

Power

The Power switch supplies and removes power from the Pro Channel. The Pro Channel
should be turned on only after all monitor levels are turned down, or off, to protect
against any "thumping" caused by high gain settings. Likewise, the Pro Channel should
be turned off after turning all monitor levels down.
The Output Level VU meter will illuminate when power is on.

Rear Panel Connections

Input and Output Connections

The Pro Channel's XLR connectors follow the AES standard: Pin 1 = Ground, Pin 2 =
Hot (+), Pin 3 = Cold (-). The unbalanced ¼" phone jacks are the typical Tip = Hot (+),
Sleeve = Ground.
Note: None of the Pro Channel's circuitry is connected directly to the metal chassis.
This means that either the input or output ground must be connected to another portion
of the signal path in order to establish a ground reference.
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