Control Mode Trimmers; Outputs; Line Inputs; Microphone Inputs - AKG AS 4+3 Modo De Empleo

2 Description

CONTROL MODE Trimmers

2.5.3 Outputs

Refer to Fig. 9.

2.5.4 Line Inputs

Refer to Fig. 10.

2.5.5 Microphone Inputs

Refer to Fig. 11.

2.5.6 Power Input

Refer to Fig. 12.
Important!

2.5.7 Block Diagram

3 Interfacing

3.1 Audio Connections

Important!
12
HOLD TIME 4s and HOLD TIME 8s: These two switches allow you to set the amount of time (1 to
12 seconds) for which the MIC inputs will remain on after the talker has stopped talking (see also
section 4.1.2).
DUCKING ATTENUATION: This trimmer pot sets the amount by which the mic input channels MIC 2-4
and the line input channels LINE 1-3 are attenuated when MIC 1 places the mixer in Ducking mode.
The control range is 20 dB (full CCW) to approx. 9 dB (full CW). DUCKING ATTENUATION thus lets
you define, for instance, how much quieter background music from a CD player will be heard while
MIC 1 is being talked into.
GATE ATTENUATION: This trimmer pot sets the amount by which all microphone input channels (MIC 1
to 4) are attenuated when there is no activity in them. The control range is from 26 dB (full CCW) to
approx. 14 dB (full CW). GATE ATTENUATION thus allows you to define how loudly the microphone
signal in a channel will still be audible even if that channel is off. This is rather important in discussi-
ons because a certain amount of ambient sound will remain audible even when nobody talks.
LINE OUTPUT: This XLR connector provides the electronically balanced, combined output signal of all
input channels. You can use the front panel OUTPUT LEVEL control to set the output level. The nomi-
nal output level is approx. 0 dBu.
REC OUT: These two RCA jacks provide an unbalanced feed for a cassette deck or other recording
equipment. The REC OUT jacks carry the output signal of all input channels. The signal at the
REC OUT jacks is not affected by the MASTER OUTPUT controls (BASS, TREBLE, and OUTPUT
LEVEL). The output level is approx. 0 dBu.
LINE IN 1 to 3: These three sets of two RCA jacks each allow you to connect external audio sources
such as CD players, tuners, cassette decks, etc. Stereo signals are automatically summed to mono.
The nominal input level is –10 dBu.
MIC 1 INPUT to MIC 4 INPUT: Balanced XLR sockets for connecting low-impedance dynamic or con-
denser microphones.
PHANTOM PWR: This DIP switch switches phantom power for the channel on (lower position) and off
(upper position).
+20 dB: In its lower position, this DIP switch increases the input gain by 20 dB (making the signal louder).
With the +20 dB switch in its upper position, the input gain will remain unchanged (refer to Table 1 in
section 4.1).
PERMANENT ON: Toggles between Auto and Manual modes.
Upper position - Auto mode: The channel will open automatically as soon as activity (e.g., some-
body talking into the microphone) is detected at the input. If no activity is detected, the channel will
automatically switch off after a delay you can set with the HOLD TIME switches.
Note:
The gates will not switch the microphone channels off completely but attenuate them by 14 to 26 dB.
To keep input signals inaudible, turn the appropriate LEVEL control(s) on the front panel all the way
CCW.
Lower position - Manual mode: the channel is permanently open irrespective of the input signal.
GAIN: This trimmer pot fine adjusts input gain (see also Table 1 in section 4.1).
AC INPUT: Input jack for the supplied AC adapter.
Operate the mixer with the supplied AC adapter (12 V AC) only. Operating the mixer with a dif-
ferent power supply or on DC may damage the equipment.
Refer to Fig. 13.
Make all audio connections before connecting the mixer to power.
Refer to Fig. 14 for a wiring example.
1. Connect your microphones to the rear panel MIC INPUT connectors. Refer to the instruction manual(s)
of your microphones.
Note:
Connect the microphone that will control ducking to MIC 1 INPUT.
2. On each channel to which you connected a condenser microphone, switch phantom power on by
setting the PHANTOM PWR switch to its lower position.
If you use wireless microphones, be sure to switch phantom power off on each channel to
which you connected a receiver. The phantom voltage may damage the receiver.
3. Connect your audio sources (CD-Player etc.) to the LINE inputs using (optional) RCA cables.