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8
ProMix 12 Installation and Operation Manual
OPERATION
3.3 TALKBACK MICROPHONE INPUT
The console includes a Talkback system that permits the console operator to speak
to an announcer who is wearing headphones connected to the Booth output. When
the TALKBACK button is pressed, the “normal” audio being fed to the Booth out-
put is interrupted and is overridden by audio from the Talkback circuit. Because
Microphone 1 is normally used as the “console operator Microphone”, Microphone
1 is used to talk back to the Booth announcer. Another audio source can be substi-
tuted for Microphone 1 (e.g, an intercom output) if necessary. See Figure 2 (Section
2.2.1). The jumper between pin 12 and pin 8 should be removed. External Talkback
audio can be fed into pin 8 (ground is pins 1 or 5). This input is unbalanced; the
nominal input level should be about –10dBm.
3.4 LINE CHANNEL GAIN ADJUSTMENT
Each of the console’s nine Line channel inputs has an Input Sensitivity switch (13)
that must be set according to the source equipment being used with each Line chan-
nel input. These switches can be operated using the eraser-end of a pencil. There
are two settings: OUT and IN. Set the switches OUT for professional levels, e.g,
+4dBm or +8dBm; set switches IN for use with “consumer” equipment operating at
about –10dBv. (The Line channel inputs are bridging and will not load source
equipment.)
4.0 OPERATION (See Figure 4 for controls (x) referenced in the
text.)
Operation of the ProMix 12 is simple and straightforward. Audio sources can be
mixed to the Program and/or Audition buses. Line channels can be also be fed to
the Cue bus. The console’s outputs can be monitored via the Monitor system and
VU meters. The console operator can also use headphones, plugged into the Phones
output. A separate Booth output can feed headphones used by a booth announcer.
The console operator can talk to the booth announcer using the Talkback function;
the booth announcer can respond using the Talkback feature in the announce booth.
4.1 MICROPHONE INPUT CHANNELS
Microphone channels are turned on and off using the Microphone ON/OFF buttons
(1). When a Microphone is ON, the “ON” LED (4) will be illuminated. Microphone
audio can be assigned to the Program bus using the PGM button (2). The AUD but-
ton (3) assigns Microphone channel audio to the Audition bus. Both buses can be
used simultaneously. The relative mix level is determined by the FADER (5). The
“normal” position is –15dB, which yields 15dB of “in hand” gain. Microphone 1 is
pre-programmed to mute the Monitor system when Microphone 1 is on.
Microphones 2 and 3 can be user-programmed to mute the Monitor system if nec-
essary. (See Section 3.2.)
(18 paginas)
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