ProMix 4 Installation and Operation Manual
INSTALLATION
ADJUSTMENTS AND SETUP
MICROPHONE INPUT GAIN ADJUSTMENT
Each of the 3 microphone input channels has a GAIN adjustment (1) to optimize the
microphone preamp gain for the microphones being used. The gain can be varied
from +28 dB to +60 dB range. Use a small screwdriver to adjust the gain trimmers as
needed. Set the microphone channel’s rotary control to three o’clock and adjust the
gain trimmer to peaks of zero on the VU. To quickly set mic gain, follow these steps:
1. Turn on the microphone channel.
2. Set both the microphone and program channels rotary pots to twelve o’clock.
3. Speak into the microphone; set gain so that voice peaks read about 0VU on the
ProMix 4 VU meters.
MICROPHONE CHANNEL MONITOR MUTE PROGRAMMING
The ProMix 4 Monitor output can be programmed so that when Microphone 1, 2, 3
and/or line input 4 are ON, the audio output from the Monitor output is muted. If any
of the microphones are in the same studio as the Monitor speakers, the Monitor out-
put should be set to mute to prevent acoustic feedback when any of the microphones
are on. Locate the four position “MUTE” DIP switch (2) to the right above the PGM
Out pot. To mute the Monitor output for each microphone channel, turn on the DIP
switch representing that microphone and line channel. Example: To mute the moni-
tor when microphone 1 is ON, set DIP switch 1 to the ON position. The same holds
true for microphone 2, 3 or line channel 4.
TALKBACK USAGE
The ProMix 4 includes talkback capability that permits the ProMix 1 and/or ProMix
4 users to speak to an announcer who is wearing headphones connected to either a
ProMix 1 or ProMix 4 via the optional ProMix HUB 6. When the TALKBACK but-
ton (3) is pressed, the “normal” audio being fed to the Program output is interrupt-
ed and is overridden by audio from the Talkback circuit. All assigned channels are
fed to the “Talkback” buss attached to the ProMix HUB 6. When the talkback push
button is pressed, a short burst tone is injected into each headphone, notifying the
connected users that one of the attached ProMix’s would like to talk. To use the talk-
back system, simply press and hold the “Talkback” push button for as long as you
want to communicate. All partiers wanting to talk, simply presses and holds the talk-
back button.
The short tone burst is generated each time the talkback button is pressed. The tone
level can be adjusted on the Hub.
LINE INPUT CHANNEL ADJUSTMENT
Each of the ProMix 4-line inputs are set for +4dBu, which is the professional level
standard. If consumer level equipment is use, a level interface device must be used.
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