User manual

Operating the 900xl Power Amplifier
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5.1 Connecting a PC
You can control the 900xl with a PC (or other controllers) via the RS-232
port using serial commands.
To connect a PC to the 900xl:
• Connect the RS-232 9-pin D-sub port on your PC to the RS-232
rear panel port on the Master 900xl using a cable as shown in
Figure 4:
Figure 4: RS-232 Control Cable
6 Operating the 900xl Power Amplifier
You can operate your 900xl using:
• The front panel buttons
• RS-232 serial commands transmitted by a PC, touch screen
system, or other serial controller
6.1 Using the Front Panel Buttons
To operate the 900xl using the front panel buttons:
• To choose audio input source 1 (the PC line-out as shown in
Figure 3), press INPUT 1 button.
• To choose audio input source 2 (a stereo tape), press INPUT 2
button.
Adjust the output volume to the speakers using the VOLUME + and –
buttons.
Note: In the case of output distortion that cannot be corrected using the
volume controls, try switching the LEVEL switch on the underside of the
unit (see
Figure 2) from H to L and alter the output using the volume
control.