Daisy-Chaining Several As 4+3 Mixers; Connecting To Power; Operating Instructions; Setting Microphone Levels - AKG AS 4+3 Mode D'emploi

You can connect together ("daisy-chain") up to ten AS 4+3 mixers. This provides a maximum of 40 micro-
phone and 30 line inputs.
1. Use an optional IC AS8 connecting cable to connect the EXPANSION OUT socket on the first mixer
to the EXPANSION IN socket on the next mixer and so on.
All CONTROL MODE controls affect the parameters of the same mixer only, so you can set, say, a
different hold time on each mixer.
Also, you can define MIC 1 INPUT as the Ducking Master channel on any one, or even several, of the
daisy-chained mixers. Several Ducking Master channels will not interfere with one another, although
any one of them will cause all "normal" channels to be attenuated.
The combined output signal of all input channels on all mixers is available on the REC OUT and LINE
OUTPUT connectors on the last mixer, i.e., the one whose EXPANSION OUT is not connected to
another mixer.
The MASTER OUTPUT controls (BASS, TREBLE, and OUTPUT LEVEL) are only active on the last
mixer. On all previous mixers, REC OUT and LINE OUTPUT are muted and the MASTER OUTPUT con-
trols (BASS, TREBLE, and OUTPUT LEVEL) disabled!
Check that the AC mains voltage stated on the supplied AC adapter is identical to the AC mains
voltage available where you will use your system. Using the AC adapter with a different AC
voltage may cause damage to the unit.
1. Connect the cable on the supplied AC adapter to the AC INPUT jack on the rear panel of the mixer.
2. Connect the AC adapter to a convenient power outlet.
3. Set the POWER switch to "I" to switch power to the mixer on. The ON LED next to the POWER switch
will illuminate.
1. Turn the LEVEL and COMP/LEVEL controls on the front panel fully CCW and THRESHOLD fully CW.
2. Set the OUTPUT LEVEL control in the MASTER OUTPUT CONTROL section on the front panel to
maximum and BASS and TREBLE to twelve o'clock.
3. Set the +20 dB switch to "OFF" (up) and turn GAIN fully CCW.
4. Switch the first microphone channel on by setting the appropriate PERMANENT ON switch on the rear
panel to its lower position.
5. Turn the front panel LEVEL control for the same microphone channel up CW as far as possible with-
out causing feedback (howling noise from the speakers).
6. Talk into the microphone. If the signal is too quiet, you can use the +20 dB switch and the GAIN con-
trol to increase input sensitivity to -50 dBu max.:
+20 dB
OFF
OFF
ON
ON
7. Repeat steps 3 through 6 for all other microphone channels.
If the talker moves closer to or further away from the microphone the signal level will vary accordingly.
To compensate for such level variations, you can set COMP/LEVEL to a medium or high position
(maximum compression ratio is 2:1).
1. Set the PERMANENT ON switch on the rear panel to its upper position.
2. Turn the front panel THRESHOLD control CW to the point that the microphone channel will open as
soon as somebody talks into the microphone.
Make sure not to turn up THRESHOLD far enough for ambient noise to activate the channel.
The microphone channel will switch off approximately 1 second after the talker has stopped talking.
You can increase this hold time using the HOLD TIME switches.
1. To increase the hold time for all microphone channels to a maximum of 12 seconds, set the HOLD
TIME switches in the CONTROL MODE section on the rear panel as follows:
HOLD TIME 4s
OFF
ON
OFF
ON
The HOLD TIME switches affect all microphone channels on the same mixer (and none of the micro-
phone channels on any other daisy-chained mixer). In Ducking mode (DUCKING MASTER switch ON),
the hold time of MIC 1 INPUT is always 1 second, irrespective of the HOLD TIME setting.
GAIN
Full CCW
Full CW
Full CCW
Full CW
HOLD TIME 8s
OFF
OFF
ON
ON

4 Operating Instructions

Resulting Input Sensitivity
-10 dBu (very low)
-30 dBu
-30 dBu
-50 dBu (maximum)
Resulting Hold Time
Minimum, approx. 1 sec.
4 secs.
8 secs.
12 secs.
3 Interfacing
3.2 Daisy-chaining Several
AS 4+3 Mixers

3.3 Connecting to Power

Important!
Refer to Fig. 12.

4.1 Setting Microphone Levels

Refer to Fig. 2.
Refer to Fig. 4.
Refer to Fig. 11.
Table 1: Setting input sensitivity.
Note:
4.1.1 Auto Mode
Refer to Fig. 11.
Refer to Fig. 2.
Important!
4.1.2 Setting Hold Time
Table 2: Available hold time
settings.
13