Setup; Phantom Power - AKG AS8 Bedienungsanleitung

AS8/AS8TC

5. Setup

Setup of the AS8 consists of choosing rear panel dip switch options, setting front panel levels, and
adjusting the compressor/leveller (if used). Using the Remote Level Control capability of the AS8 is
addressed in the another section of this brochure. When the power is turned on to the AS8, it will
display its serial address on the Channel On LEDs for 1.5 seconds before entering normal opera­
tion. Channel 8 On LED represents the most significant bit of the binary address, while Channel 1
On LED represents the least significant bit.
Auto or Direct mode
1) Select using dip switch 1 on channels 1-8. Normally, all speech micro­
phones would be in the Auto mode. Microphones used for music (e.g. choir mics in a church
sound system), or inputs attached to line level devices like tape players or VCRs are best used in
the Direct mode. The Remote Level Control terminals may be used to manually turn off Direct
mode microphones when they are not in use.

Phantom power

2) Turn on or off as needed, using dip switch 2 on channels 1-8. Dynamic
microphones need no phantom power, but electret types will need phantom power to operate
properly.
preamplifier gain
3) Set up the using dip switches 3 and 4 on channels 1-8. The 0dB position is
used for line level sources like tape players or VCRs. The 30dB position works well for higher output
microphones like electrets. The 50dB position is best for dynamic microphones, or electret types
where the distance from the talker to the microphone is more than 3 feet or so.
Main Level contro
4) Set the l between 5 and 6. While speaking into each microphone in turn,
adjust the Channel Level to give adequate volume level. The normal operating position of the
Channel Level control should be between 10 o'clock and 2 o'clock. Try to adjust all microphones
to about the same volume level, as this will result in the most optimum automatic action.
compressor/leveller
5) If the system is to be used, switch the In/Out front panel switch to the In
position. With a normal talker, adjust the Threshold pot until the 3dB Gain Reduction LED flickers on.
The system volume level may need to be readjusted at this point using the Main Level control.
Next, check that a loud talker turns on most or all of the remaining Gain Reduction LEDs. Finally,
with a soft talker such that no Gain Reduction LEDs are lit, be sure there is no feedback or ringing
in the system.
The system is now ready for use.
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