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Output Treble and Bass Tone Controls
Treble and Bass potentiometers (fig.11C and
D) provide tone control facilities for the
output of the module.
In the vertical (12 o’clock) position, the
signal is unaffected. Turning the control
clockwise increases the level of the relevant
treble or bass frequency range by up to 10
dB. Turning it anticlockwise decreases the
frequency range volume level by up to 10
dB.
Front panel controls of Control Centre
(fig.4.1E)
To allow the operator to control the music
sources, four Music Function Keys are
provided on the front panel of the SM30
Control Centre. These keys allow the
operator to select the music source; alter the
music volume level up or down; and mute
the music signal. When either the ‘Music
Volume up’ or ‘Music Volume down’ key on
the Control Centre is pushed, the output
volume of the Music Input Module changes
in steps of ‘3’ over a range of ‘00’ to ‘99’.
Each step of 3 represents 2 dB, with ‘99’
equalling 0 dBV. Any, or all of these four
functions can also be remote controlled via
the Function Keys on the Call Station.
11.3 Programming
Software routing to zones
For details of routing the music signal to
specific loudspeaker zones see user
programming 14.3.1 step 19 ‘F-key music
routing’ and menu 4 ‘Music routing’ and
installer programming 14.7 menu 13 ‘Direct
routing’.
Display music source status
The current music source and the output
volume level can be seen on the bottom line
in the display when SM30 is in its normal
‘run’ mode. See installer programming
14.7.6 ‘Music Input text’ to alternate the
names for sources 2 and 3 for showing on
the display.
Fig. 11 - MUM
A
B
C
D
LBB 1286
GB/SM 30 user manual 5/26/98 10:18 AM Page 29