Environment; Description; Introduction; Unpacking - AKG AS 4+3 Mode D'emploi

1 Safety and Environment

1.2 Environment

2 Description

2.1 Introduction

2.1 Unpacking

2.3 Optional Accessories

2.4 Front Panel

2.4.1 Microphone Input
Controls
Refer to Fig. 2.
10
1. The AC adapter will draw a small amount of current even when the equipment is switched off. To save
energy, disconnect the AC adapter from the power outlet if you will leave the equipment unused for a
long period of time.
2. When scrapping the equipment, separate the case, circuit boards, and cables, and dispose of all com-
ponents in accordance with local waste disposal rules.
Dear Customer:
Thank you for purchasing an AKG product. This Manual contains important instructions for setting up and
operating your equipment. Please take a few minutes to read the instructions below carefully b e f o re operat-
ing the equipment. Please keep the Manual for future re f e rence. Have fun and impress your audience!
The AS 4+3 is an automatic mixer with four gated microphone inputs and three line inputs, a balanced
line output and an unbalanced output for connecting an audio recording device.
Each microphone input provides switchable 24-V phantom power for condenser microphones and a
separate compressor/limiter.
A switchable ducking ("priority") mode reduces the gain of all inputs for as long as signal is present in
MIC channel 1.
An NOM attenuation function reduces the output level by approx. 2 dB every time the number of open
microphones doubles.
Special rear panel EXPANSION connectors allow you to "daisy-chain" up to ten AS 4+3 mixers providing
up to forty microphone inputs.
1 AS 4+3
1 AC Adapter
Check that the package contains all the parts listed above. If anything is missing, please contact your
AKG dealer.
IC AS8 connecting cable for daisy-chaining two to ten AS 4+3 mixers.
MK 9/10 microphone cable: 10-m (30-ft.) 2-conductor shielded cable with male and female XLR
connectors.
Refer to Fig. 1.
THRESHOLD: This trimmer pot sets the threshold above which the input channel will open automatically.
(As long as the microphone level is below the threshold, the input level is attenuated by 14 to 26 dB.)
The control range is from approx. 0 dB to –32 dB with reference to the nominal input level.
With the THRESHOLD pot turned fully CCW, the threshold is approx. –32 dB. The input level detect-
or is very sensitive and the channel will open even if you speak into the microphone rather softly.
The further you turn THRESHOLD CW, the less sensitive the level detector will be and the louder you
will have to speak into the microphone to switch the input channel on. With THRESHOLD fully CW,
the threshold level will be above 0 dB. In this setting, it is almost impossible to open the channel by
talking into the microphone.
Since the THRESHOLD control is not affected by the LEVEL setting a channel may come on even if
the LEVEL control is set to minimum. Although the microphone signal in that channel will remain in-
audible, the channel is actually open and adds to the number of open microphones (NOM) so it may
trigger (or increase) NOM attenuation (see also section 4.5). To avoid this effect, turn THRESHOLD up
CW far enough to prevent the channel from coming on inadvertently.
ON: This blue LED will light to indicate the channel is on. It extinguishes when the channel switches off.
LEVEL: This rotary control sets the volume level of the channel..
COMP/LEVEL: This trimmer pot sets the compression ratio. With the COMP/LEVEL pot fully CCW there
will be nearly no compression and channel gain will be independent of the input level. When you set
COMP/LEVEL fully CW, the input signal will be compressed at a ratio of approx. 2:1. This means if the
input signal level rises by 2 dB the output level will rise by only 1 dB.
Compression will keep the output level fairly constant even if the talker frequently moves closer to or
further away from the microphone. We therefore recommend to turn up COMP/LEVEL for talkers with
little experience of using microphones.