Tannoy TMA120 Operating Instructions Manual - page 4
4
Remote Level: These two screw terminals (plus "
ý
")
provide remote volume control of the master level.
An internal voltage controlled amplifier (VCA) allows
remote control from up to 2000 ft (600m) away,
using any 5k~50k linear taper potentiometer and/or
switch to provide adjustment and/or muting of the
master level. Potentiometers are wired with high-
side to "+10V", low-side to "
ý
", and wiper to "C".
Switches simply connect (or disconnect) "+10V" to
"C", and do not require a ground (‘
ý
’) connection.
NOTE: The factory installed jumper (between
"+10V" & "C") must be in place when a remote
control is not being used.
Mute/Chime: This screw terminal (plus "
ý
") allows
manual muting of any selected channels, via an
external switch or contact closure (see Assignment &
Priority below). When the Chime Level control is
turned up (on), a pre-announcement chime tone will
also be activated by the switch or contact closure.
Stacking In: These screw terminals provide a
balanced line-level input to the mix bus, for input
expansion. Stacking In is before Loudness, Tone,
Compressor, Master Level, & Low Cut. For
unbalanced input, wire high to (+) and ground to
both (-) & (
ý
).
Assignment: These five DIP switches are used to
assign specific functions to the individual channels.
To assign a function, move the respective switch to
the left. Phantom Pwr assigns +24 Volts DC
phantom power to the channel input, for powering
condenser microphones.
CAUTION: TO AVOID
DAMAGE TO EQUIPMENT, ASSIGN PHANTOM POWER ONLY
ON CHANNELS WHICH ARE SELECTED FOR 'MIC' INPUT
AND WHICH REQUIRE PHANTOM POWER.
Auto Mute
assigns a (non-priority) channel to be muted
whenever signal is present in any "priority" channel.
Manual Mute assigns a channel to be muted
whenever the Mute/Chime terminals are shorted
together via a switch or contact closure. Mute Level
assigns the amount of muting (-10dB, -20dB, or -
40dB) which is applied to a channel, when triggered
by either Auto Mute or Manual Mute. NOTE: -10dB
muting will occur when both switches are to the right.
-40dB muting will occur when both switches are to
the left.
Trim: This control adjusts the input gain of the
channel, to compensate for various input signal
levels. Once the Line/Mic switch has been set to the
proper position (see Line/Mic below), the Trim
control should be adjusted so that peaks in signal
level do not cause distortion at the channel input.
Priority: This switch assigns a channel to "priority".
When signal is present in a "priority" channel, any
(non-priority) channels which are assigned to Auto
Mute will be muted by their selected amount. NOTE:
A "priority" channel cannot be auto muted by another
"priority" channel, but a "priority" channel can be
manual muted.
Line/Mic: This switch selects the proper impedance
and gain for either microphone or line-level input
signals. Depress the switch for line-level input.
Release the switch for microphone input. On
Channel 1, the Tel switch (see Tel below) must be
released for the Line/Mic switch to operate.
Tel (Channel 1 only): This switch selects the
proper impedance and gain for input from 600 ohm
sources. The input for Channel 1 includes an
isolation transformer, which allows connection to
most telephone system audio ports.
Inputs: These screw terminals provide a balanced
input connection for the channel. For unbalanced
input, wire high to (+) and ground to both (-) & (
ý
).
The input for Channel 1 includes an isolation
transformer.