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TOUR GRADE SERIES
3.3 Indications
PROTECT
Whenever the PROTECT-LED lights yellow, one of the internal protections has been activated. However, a
lit PROTECT-LED does not necessarily mean that the signal path gets switched off. The differentiated
protections concept of TOUR GRADE SERIES power amps results in several protection circuits being
activated one after another, which ensures that under normal circumstances the power amplifier will stay in
the safe and stabile operating range. In case the amplifier needs to be switched off to prevent power
amplifier and connected speaker systems from being damaged, this is indicated by the PROTECT and
MUTE-LEDs being lit simultaneously.
MUTE
The MUTE-LED lights red whenever the power amp's output signal is being muted, which happens for
example during power-on delay of the speaker systems, when switching the input sensitivity, and when
manually muting the output signal via IRIS-Net™.
-30dB...LIMIT
Level indication is realized via two vertical LED chains on the power amp's front panel that individually
indicate the actual levels of each channel at -30dB, -20dB, -10dB below full modulation and 0dB as soon
as full modulation is reached. 0 dB indication results from comparing the power amp's internal ratio of input
to output voltage, which ensures precise indication of the full modulation limit, even before limiting
becomes audible. If the input audio signal is driven above the 0 dB mark, a clipping limiter reliably controls
distortion down to a stable rate of 1 %. The red LIMIT-LED has a dynamic brightness control that makes it
easy to perceive the degree of limiting applied to the signal.
POWER
The POWER-LED lights green when the power amplifier is on. If the POWER-LED does not light, despite
the fact that the amplifier has been switched on, this indicates that the power amp is not connected to the
mains, the primary fuse has blown, or the amplifier is in standby mode (the STANDBY-LED lights yellow).
The POWER-LED blinks whenever the voltage at the MAINS IN is too high (overvoltage) or too low
(undervoltage), which prevents that the power amplifier can be switched on.
STANDBY
The STANDBY-LED lights yellow when the power amp is in standby mode. Standby mode reduces the
amp's power consumption to an absolute minimum. Activating the standby mode is only possible via IRIS-
Net™. Deactivating the standby mode is possible via IRIS-Net™ as well as directly on the power amplifier.
For deactivating the standby mode, select Power from the Module Config menu (see page 29).
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