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MACRO range installation manual. Issue 6
leaving the factory, the controls will be set for level response. See Fig. 1
A conventional master level control is featured on the mother PCB between the line driver module (TB.6 etc) and the pre-amplifier
stabiliser module (PS.9 etc.) next to it. This control is set to maximum (fully clockwise) on leaving the factory. See Fig. 1
INPUT MODULE SYSTEM
The general accent of MACRO system amplification is towards flexibility of system design. Each MACRO mixer or mixer amplifier
will accommodate up to 8 purpose designed input modules selected from over 30 variations of pre-amplifiers, tone signal and
alarm generators. Any of the modules from the published list may be used in any of the 8 input channels of the amplifiers.
Modules are available to accept audio input signals for low-level processing from all known audio sources. Depending on type,
each module may be given a priority within the amplifier as described below. The chosen group of modules is set up within the
amplifier by the commissioning engineer to exhibit the required sequence of priorities for the specific sound system, and further
individually adjusted on the module for sensitivity, tone frequency, etc. These system adjustments are not directly accessible to
the user, who is confined to the front panel controls. Modules may be changed, removed, or adjusted at any time without
disturbance to the general operation of the system. Where priority sinking is featured, two alternative sinks are offered simultaneously
- Any priority, and Individual input priority. Therefore, external circuits such as relays, lamps, MACRO zone control systems
etc., may be triggered by any input channel or a specific input channel (or channels) by appropriate auxiliary connections. A
Chime Duration Monitor circuit, where fitted, gives clearance-to-speak information for paging systems via the CDM current
sink connection of the auxiliary output. Priority sinks and CDM current sinks operate independently of each other. The general
concepts are illustrated in APPENDIX B
Module installation
MACRO range amplification is intended for permanent installation, and consequently the plug-in concept of the modules does not
anticipate continuous or regular changing of modules. Whilst this is possible, the edge connector contacts may wear prematurely
and become intermittent and unreliable. Modules are located between vertical supports immediately behind the respective front
panel volume control, and only moderate force will be required when fitting or removing. DO NOT put pressure on the components
during this operation.
Module range
The range of input modules extends to cover all common functions though others may be added to suit demand. The current
range is shown below.
Fig. 1 Location of Treble, Bass, and Master gain controls