Note:
The power amplifier supports the modules with ±15VDC. The power amplifier’s integrated power supply
is capable of providing a maximum continuous current of +/- 300mA. You can easily check the overall
power consumption by simply adding the individual power consumption stated for each inserted module
(separate data sheet). In any case, the result should be less than 300mA. The input module Xi-11 for
instance needs 18mA and a V-Systems filter module needs approx. 70mA. If two V-Systems and one
XiII-module are inserted, the resulting total power consumption is 158mA; clearly below the possible
maximum continuous current.
2. LIMIT
This indicator lights whenever the internal dynamic limiter is activated and the power amplifier is operated
at the borderline of clipping or generally at the top margin of its range of operation. Short-term blinking is
not a problem since the internal limiter can controll input level up to +20dBu with a maximum THD of 1%.
If this LED is constantly lit, reducing the overall output level is recommended to prevent that the connected
loudspeaker systems are being damaged by overload.
3. OUT
Whenever an audio signal with at least 1.4Veff is present at the output, the OUT-LED lights. When there
is a short-circuit in one of the loudspeaker connection cables or one of the protections is activated this
indicator is dimmed.
4. POWER switch
The POWER switch is used to switch the appliance’s power on. An initial inrush current limiter avoids that
the power amplifier gets damaged from mains peaks. This also prevents that the mains fuse blows when
the power amplifier is switched on. The loudspeaker power outputs are delayed switched by approx. 2
seconds via relays, so that no switching noise is audible.
5. Power ON indicator
This indicator lights as soon as the POWER switch gets pressed; respectively as soon as the power
amplifier is operational. In case the Power ON indicator does not light, the appliance is not correctly
connected to the mains network or the primary fuse is defect. Please also refer to the description of the
STANDBY function.
6. PROTECT
Whenever the PROTECT indicator lights, one of the internal protections against thermal overload,
short-circuit, Back-EMF, HF at the output, etc. has been activated. In that case, the output r elays separate
the power amplifiers from the connected loads, preventing the loudspeaker systems or the p ower amplifier
itself from being damaged. Find and remove the source that caused the faulty operation - e. g. a
short-circuit in one of the loudspeaker connection cables. If the error has been caused by thermal overload,
you have to wait for a short period of time until the power amplifier automatically regains its operational
state.
7. STANDBY
X-Amp Series power amplifiers are prepared for remote control operation. Only when the amplifier is
operated in this mode the STANDBY indicator is active. STANDBY mode is activated by switching the
power amplifier on by use of the Power-ON switch. The STANDBY LED lights indicating that the appliance
is connected to the mains and operational. POWER-ON mode is activated via the remote control unit.
The STANDBY LED is dimmed and the POWER-ON LED lights.
F R O N T V I E W
19
