Stereo Program In Connector, Talkback Microphone Input

CENTURY SERIES

GTX

Stereo Program In

The Stereo Program In section (on the GTx Master section) controls the way in which the Stereo Program In signal is rout- ed through the console. Controls for gain, HF/LF EQ, bus assignment (Mono, L/R, Aux 1/2, Aux 3/4, and Matrix A/B buses), balance, level, muting, and PFL are included. Red Peak and green Signal Present LED’s are located next to the PFL switch.

Stereo Program In Connector

This 1/4-inch jack, usually used for stereo program music, accepts an unbalanced stereo line level signal. Polarity is as follows: Tip=Left, Ring=R, Sleeve=Ground

Talkback Assignment Switches

These switches assign the talkback signal to the outputs and/or auxes. Switches exist for External Talkback Output, Mono (Center) Bus, Left/Right Buses, Groups, Auxes 1-8 (in pairs), and Matrices A and B. The same routes are also used when the oscillator is selected. This overrides the talkback source.

Talkback Level Control

This knob controls the final level of the talkback signal.

Talkback Microphone Input

Found on the top of the master section and under the arm rest on the right side, these balanced XLR inputs allow for a micro- phone or other balanced mic-level source to be connected to the talkback system. Default for this connector is +48V DC. It is advised to connect only one talkback microphone at a time.

Talkback Enable Switch

This switch activates the entire talkback system including the internal oscillator.

XLR Balanced Outputs

These outputs are designed to drive both balanced and unbal- anced input devices without adaptation. Signals are normally balanced on this output connector. The output will drive all load impedances from 600 ohms upwards with full perfor- mance specifications. The output is designed so that if either pin 2 or pin 3 were intentionally shorted (as in connecting to an unbalanced input of your next stage of electronics) or acciden- tally shorted, the output level of the non-shorted connector pin increases by 6db. This is an amount equal to the normal loss of a balanced output when one pin of a balanced output is short- ed. The result is no need for external gain make up.

XLR Microphone Input Connector

Balanced XLR Input is designed to receive professional Low Impedance microphone signals. The input Gain controls on the front panel adjust for most input levels. In the event of exces- sive input levels, the front panel input pad switch should be pressed. Front panel selection of 48 Volt Phantom power enables most types of condenser microphones that require such power to be used. See your device’s operating manual for cor- rect operation. (If in doubt that your non-condenser micro- phone may be damaged by using Phantom Power, please make sure that the front panel phantom power switch on that input channel is in the off [out] position. Operate this switch with the channel muted to avoid sending ‘thumps’ to your speakers.)

This input may also be used for low level line input signals, provided the source (instrument) is able to drive a 5k Ohm or higher load. (See your instruments or electronics owner’s man- ual for output impedance.) When line output devices such as tape players are plugged into the microphone input, special care should be observed that the phantom power is turned off on that channel, as damage may result. Because of this, it is recommended that the 1/4" line input connector be used when connecting a line level device. 48 Volt Phantom power is not present on these input connectors, and the impedance of the line input connector is high enough to accept any line level device.

APPENDIX C