Line Input Jack, Matrix AFL, Matrix Level Control

CENTURY SERIES

GTX

below the dialed-in frequency. A peak setting would be used to boost or cut the specific dialed-in frequency.

Line Input Jack

This is a balanced, high impedance input which is designed to accept both balanced and unbalanced line level inputs. To select this input source, press the front panel LINE switch. See the Connections and Conventions section for specific informa- tion on plug polarity and signal assignments.

Line Switch

This switch, when pressed, selects the balanced Line Input as opposed to the default balanced XLR Mic input.

Local Monitor Level Control

This control adjusts the level of the signal to the Local Monitor Outputs on the back of the Master Section. Note that the DIM switch can be used to introduce a -12 dB attenuation to the local monitor.

Matrix AFL

See SOLO

Matrix Level Control

These controls adjust the amount of group, L, R or Mono sig- nal fed to the respective matrix.

Matrix Master Control

These controls adjust the final signal level for the associated matrix output.

Matrix Post Switch

This button switches the group, L, R or Mono matrix send between pre and post fader. Up position is pre.

Meter Bridge

The GTx 52 and 64-frame consoles include 21 mechanical moving-magnet type indicators (44 frame: 13 meters) which show the output levels. These indicators are VU-type and are calibrated during manufacturing to 0 = +4dBu, 1.23V RMS 1kHz. The VU-type characteristic averages the signal level over short time periods (about 300mSec) so that the ‘beat’ is visible. Short duration peaks (snare drum and other signals with similar transient peaks) are under-indicated. Meters are illuminated by amber LED's which do not require attention or adjustment.

When faders are set a ‘0’ calibration positions, then the opti- mum signal to noise and overload margin conditions are obtained. In this situation, signal peaks up to +3 are usually undistorted. The recommended normal range is between -10 and 0; operation with channel and output levels below -10 is not recommended - headroom is wasted at the expense of sig- nal-to-noise ratio. The solo L - R meter pair shows the PFL or AFL level of the selected source. When no PFL or AFL is selected, the headphone and monitor output is the main stereo output. The solo meter is inactive when no PFL or AFL is selected. For GTx Level Meter calibration information, consult the GTx Service Manual or your Crest Audio dealer/service center. (The range of meter adjustment is approximately +1 /- 1dB.)

Mono Bus Assign Switch

Assigns signal directly to the Mono (Center) bus. This signal is unaffected by the position of the Pan Control, unless L-C-R panning is enabled. (See BUS ASSIGNMENT for more L-C-R information). This is useful when it is necessary to add input signal to the Mono mix without going through the Stereo sec- tion of the mixer. (An example would be a center vocal cluster configuration). In addition to the many mono output uses, this output could be used as an additional send.

Mute Switch

Turns off all send/output functions (except insert send) of the associated module including those being used as monitors. This switch does not affect the PFL switch or the LED indica- tors, enabling monitoring of input channel activity regardless of mute switch position. The mute LED illuminates when the channel is muted, either from the local mute switch or from any activated mute group. When muting a group, the group meter (on the meter bridge) level will reflect the muting. Note: the Mute switch may not affect pre signals, depending on inter- nal jumper settings. Refer to User Options.

Oscillator/Pink In Connector

This connector accepts a balanced or unbalanced signal from an oscillator or pink noise generator. This signal is assignable via the talkback assignment switches. Plugging into this jack disables the internal 1kHz oscillator.

PAD Switch

This -15dB pad (-20dB on Stereo Input module) attenuates the signal presented to the first stage of the input module. It is important to note that the Pad Switch acts only upon the bal- anced XLR input signal; it has no effect upon the 1/4" input signal. The input GAIN control should be positioned some- where within its center 80% of travel. In the event that the Gain control is set in its lower 10% of travel, and the Peak LED is indicating more than an occasional short illumination, the PAD Switch should be pressed and the Gain re-adjusted as above. In the case where the GAIN control is set to its upper range of travel (3 o’clock position or above) with the PAD switch pressed, the Gain Control should initially be lowered and the PAD switch released. The gain should then be increased and adjusted as above.

Pan Control

Pan Control is a dual device having two functions. Main Mix Pan operates with Left/Right/Mono assigns. When LCR is selected, then true LCR panning is provided. Otherwise, L-R panning is provided. Group Pan operates with the 1-8 group assigns. When PAN is selected, the odd-even assign panning is provided.

With LEFT, RIGHT, and MONO assign switches down, and LCR switch up, LEFT and RIGHT assign signals are propor- tionally varied by the PAN control, with LEFT and RIGHT signals being equal in level when PAN is in the center. The MONO assign signal is unaffected by the PAN control.

With LEFT, RIGHT, and MONO assign switches down and the LCR switch down, the LEFT and RIGHT assign signals decrease in level as the PAN control is rotated to its center position. The PAN control also governs the post fader MONO

APPENDIX B