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The Mic/Line Input module is a mono input controlled by a button switch to select
either Mic or Mono Line. Equalization is fitted as standard on this module and is enabled by the EQ
button, providing ± 7.5dB at HF ( 8kHz ) and LF ( 100Hz ). The Mic input has a jumper selectable
high pass filter to remove low frequency intrusions and a Pan control is also available to facilitate
stereo imaging.
Module gain is coarse set with preset multi-turn controls recessed at the top of the
module - the gain is trimmed with a panel Trim knob providing ± 15dB of gain. The module has a
Pre Fade Listen facility that is automatically disabled when the fader is opened. The module is held in
a mute status until the channel On button is pressed and the fader is opened.
There are logic remote input controls for Mic Cough muting and external Reverse
Talkback, with output controls to start and stop by fader or by using the On button. The remote
outputs are connected to a 9 way D type and are fed from NPN opto-isolators. The Mic module
provides a jumper selectable output to facilitate either Control Room or Studio Monitor muting with
jumper selectable Timer remote start.
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Each module has dual switchable stereo line inputs with optional EQ. Input 1 is
made on balanced XLR connectors with gain adjustable from the front panel. Input 2 can be hard-
wired on the Remote connector and has gain adjustable by Preset potentiometers on the PCB. Remote
control can be used for Remote Start and Stop.
This module shares many features with the Mic/Line module except for the
following differences : It has two stereo inputs instead of two mono inputs, the pan control is replaced
by a balance control for small adjustments to the stereo image, and there is no EQ and Cough or
Reverse Talkback remotes.
The remote output operation can be jumper configured to be either momentary (
about half a second ) or latched, to give a continuous output - a feature that may be required for some
types of turntables.
An optional RIAA equalised gram amplifier is available for this module for use with
turntables.
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This module controls the connection to the telephone balance unit and has EQ,
coarse and fine gain control, PFL and A & B output select. It has only one mono input, the other
XLR connector being used for the cleanfeed output to the telephone hybrid. This output is a true
cleanfeed ( not mix minus ) which consequently prevents phasing problems. The presenter can talk
off-air with a caller whilst the programme is being output.
The bus system allows for two cleanfeed signals meaning that a maximum of two
telco modules per mixer can be fitted. The Hold button becomes the Line Hold Remote Divert control
for the hybrid via the remote connector - no stop remote is needed.
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This module allows the user to select one of four external sources to be routed
through the desk and transmitted instead of the local source (i.e. the mixing console). The four
external inputs are connected on a 25-way D-Type (balanced) and there is an XLR connector for
output to the main transmission feed. When fitted, this output replaces the Master Output of the
mixer.
The Meter Select button determines what is shown on the meters. Either the local
output, or the transmission from the external source, routed through the desk, can be displayed.