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Chapter 5
Operation
5.1 Operation Precautions
• To prevent electric shock hazard, ensure that the power switch is set to ‘Off’ before con-
necting any input or output, or operating the switches on the rear panel, and that the con-
ductive parts of the speaker wires are not exposed. See Chapter 3 for installation
information
• Ensure that the AC mains voltage is correct and the same as the one printed on the rear
panel of the amplifier. See Chapter 3 for information about operating voltage and power
consumption
• Ensure that the switches on the rear panel for operation modes and the clip-limiter
switches are in the correct position. See Chapter 2 for information about operation modes,
and “Indicators” on page 18 for information on clip limiters
• It is always a good idea to turn down the gain controls during power-up, to prevent speaker
damage in case a high signal is present at the input
5.2 Powering Up – Soft Start
When you switch on the amplifier, it takes a couple of seconds to check its circuits. This is
known as the “soft-start” or “slow-start” sequence. The two bottom, green LEDs illuminate
to show the amplifier is operational.
5.3 Input Attenuators
The two input-level attenuators on the front panel adjust the signal level for their respective
amplifier channel in all modes. They are calibrated in dB to help setting up active loud-
speaker systems or cutting down unwanted noise from the input signal. See Specifications in
Chapter 9 for more details.
In bridged mode, both controls must be in the same position so that the speaker load is
shared equally between the channels.
BE169212.book Page 17 Tuesday, January 23, 2007 9:00 AM