THE MONO GROUP OUTPUT MODULE
This module contains the circuit for one group output and one matrix output. The signal path for the group signal is from the bus through the appropriate link depending upon which group the module is programmed to receive into the bus mixing amplifier. The signal then is fed to the balanced insert send output by an SSM2142 and returned by an SSM2143 before entering the SSM2402 used for the cut function. From here the signal passes through the fader which has 10dB of gain in hand followed by the fader buffer to make up the 10dB of gain. The signal is then balanced in an SSM2142 to become the group output signal. The group signal can be sub mixed to the main LCR bus and this can be done in stereo or full LCR if selected.
The matrix send can be taken pre or post fade and in the pre fade position it can be link programmed to be either pre or post mute. The signal is then buffered and sent onto the matrix buses. The matrix operates differently to previous DDA matrices and a full level signal is sent to all buses. Thus the matrix pots are controlling signal coming into their module as opposed to the previous situation where the pots would control the level going to another matrix output. The matrix signals are picked up, level controlled and mixed together before going to the matrix ON switch. In addition to the eight send signals the foldback, mix left/right and mix centre signals are available on the matrix. Immediately after the ON switch talkback is injected although the enable switch must be operated for this to happen. The signal is then balanced in an SSM2142 to become the matrix out signal.
Both the matrix and the group signals can be soloed and the solo enable circuits are as previously described. If LCR mode is selected then the group AFL solo will be across the three buses, otherwise it will be in stereo. The matrix solo is across the L/R buses. The group cut is electronically operated through an identical circuit to that of the input module and again there is provision for the group to be muted by any of eight master mute groups.
Q2 OPERATIONAND MAINTENANCE MANUAL 9601 | 76 |