3 Operation
3.1 Volume Control
In DUAL and PARALLEL mode, the level controls LEVEL on the power amp’s rear panel are used to control the amplification of the corresponding channel. The scale values are given in dB. Turning the control to the right increases and turning it to the left decreases the volume. In BRIDGED mode operation, the output volume for a pair of outputs is only controlled by the level control of the channel with odd number (1, 3, 5 or 7), the setting of the channel with even number (2, 4, 6 or 8) is ignored.
3.2 Indications
PROTECT
The PROT LED lights indicating that one of the internal protection circuits against thermal overload, short- circuit, Back-EMF, HF-occurrence at the output, etc., has been activated. In that case, the connected load is separated from the power amps to prevent the connected loudspeaker systems and the power amplifiers as well from being damaged. Whatever caused the fault – e.g. a short-circuited speaker cable – needs to be remedied. In case of thermal overload you have to wait until the power amplifier automatically regains normal operation.
MUTE
The MUTE LED lights red whenever the power amp’s output signal is being muted, which happens when manually muting the output signal via IRIS-Net.
-30dB...LIMIT
Level indication is realized via vertical LED chains on the power amp’s front panel that individually indicate the actual levels of each channel at -30dB, -10dB and -3dB below full modulation. The LIMIT LED lights as soon as the integrated dynamic audio limiter is activated and the power amplifier is driven at the clipping limit or generally at its maximum capacity. Short-term blinking is not a problem, because the internal limiter controls input levels of up to +21 dBu down to a THD of approximately 1%. If, on the other hand, the LIMIT LED light constantly, reducing the volume is recommended to prevent the loudspeaker systems connected from being damaged by probable overload.
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 or the primary fuse has blown.
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 possible via IRISNet or the POWER REMOTE port at the amp‘s rear panel.
IRIS-Net
The IRIS-Net LED lights blue if an IRIS-Net compatible remote control module has been installed in the power amp’s extension slot and successful data communication has been established. The IRIS-Net LED blink slowly whenever the “Find” function in IRIS-Net is being used to locate a power amplifier in the rack.
3.3 Standby Mode (POWER REMOTE)
POWER REMOTE provides a simple way to remotely power-on/off the power amplifier. The POWER REMOTE function is only useful for appliances not employing a Remote Control Modul. Controlling appliances with Remote Control Module installed per REMOTE CONTROL is practically pointless. Leaving the pins of POWER REMOTE socket open the appliance power is switched on. When connecting the pins the applicance enters standby mode.
