User manual AKG AS 8

[. . . ] Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. And do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock. To avoid hum or interference, route all audio lines, particularly those connected to the microphone inputs, away from power lines of any type. If you use cable ducts, be sure to use separate ducts for the audio lines. [. . . ] If your condenser microphones will operate on +15 V phantom power, set the rear panel dip switch no. 2 for the appropriate channel(s) to ON to switch phantom power for each condenser microphone on. Each audio channel provides an unbalanced direct output called DIR. OUT terminals as additional outputs, DO NOT connect the ground lead (shield) of the cable to the ground terminal of the respective input but to the ground terminal of the MAIN OUT. Use the supplied RS-232 cable to connect the RS-232 port on the AS 8 / AS 8 TC rear panel to the RS-232 port on your computer. The REMOTE LEVEL CONTROL 15-pin D-Sub connector on the rear panel of the unit allows you to control the level of each channel separately or to mute channels individually. Depending on the application, you can use potentiometers, switches, or external control voltages. 2 shows three examples: Continuous level control of channel 1 using a 10 k linear pot. Continuous level control of channel 7 using an external DC control voltage (Uext = control voltage, = ground). 1 Local Mode You can set up and operate your AS 8 / AS 8 TC either in Remote mode from a computer or in Local mode using the controls on the AS 8 / AS 8 TC itself. If you have not connected the AS 8 / AS 8 TC to a computer, you can set all parameters on the unit itself as soon as you switched power to the unit on. if you connected the AS 8 / AS 8 TC to a computer and installed the supplied software (refer to section 4. 2), you will first have to click on "Local AS 8" in the main menu. Switch the unit ON with the POWER switch and adjust the various parameters: 1. dIRECT/AUTO: The rear panel dip switch no. 1 toggles the appropriate channel between DIRECT (always on) mode and AUTO mode (the channel will be open for as long as somebody talks into the microphone). 2 switches phantom power ON or OFF for each channel. The LEVEL rotary pot on the front panel adjusts the relative signal level of each channel. Output level: The front panel OUTPUT LEVEL control sets the output level at the MAIN OUT terminals. Compressor/Leveller: The COMP/LEVEL IN/OUT switch lets you switch the compressor/Leveller into (IN) or out of circuit (OUT). Tone controls (AS 8 TC only): The LF controls cut or boost the low frequency range for each channel, the HF controls cut or boost the high frequency range. Make sure the rear panel MASTER/SLAVE switch is in the correct position (refer to sections 3. [. . . ] Use the arrow buttons below "Thr" to set the compression threshold. The "Channel Section" part of the screen shows the status and signal level of each channel. To display additional information, click on one of the keys "Ch1" to "Ch8" at bottom right, for instance, "Ch1". The "Channel x" field will indicate the Channel Level, Channel Attenuation, and Channel Remote Level of the selected channel (in this example, "Channel 1"). [. . . ]