High Power Amplifier P
RO
A 2000
Page 7
Protect A/B
a protection function is active, A/B-
speaker outputs are switched off, the
input of the power-stage is muted (Mute)
HF-DC A/B
At the amplifiers output a non audible
signal such as HF or DC is present,
speaker outputs are switched off and the
power stage is muted (Protect and Mute)
Temp A/B
the power stage A/B is overheated
(>90°C [>194°F])
Temp-Limit A/B
the temperature in the power electronics
has come up to 85°C (185°F), the limiter
reduces the output level by 10 dB
Limit off A/B
the internal distortion-, RMS- and peak-
limiters are disabled when using an
audio-controller, the thermal limiter is
always active
Mute A/B
channel A/B is muted
Level 2 A/B
the intern 2nd volume trim-pots on top
are enabled, the front side volume
controls are out of order
Havarie A/B
one or both channels are defective,
inputs and outputs are switched over to
a redundant amplifier. This function is
only available with the optional HAVA-
RIE-unit.
Stereo
normal stereo operation
Mono
mono operation, both channels are fed
by the A-input signal
Bridge
the two channels are working in bridge
mode and are fed via the A-input
connector. Please use only the bridge
marked speakon output connector - see
figure 5.
Digital on
the optional analog to digital converter
is in operation. Only the digital inputs
(AES/EBU and SPDIF) are active.
Remote
an optional remote control card has been
plugged in and is active
Havarie on
an optional HAVARIE-card has been
plugged in and switched on
Audio-Modul 1 on
an optional audio-module has been
activated in slot 1
Audio-Modul 2 on
an optional audio-module has been
activated in slot 2
Audio-Modul 3 on
an optional audio-module has been
activated in slot 3
Low Power Mode
the power stage is in standby mode,
because there is no input signal present.
In the automatic standby-mode the
power stages idle current is put to zero
to reduce energy consumption and not
to heat up the rack needlessly.
3.4 Determining modes and signal inputs
Fig. 11 Inputs and mode switches
Limit on/off
deactivates all limiters except for the
thermal limiter, which is always in
function. Plugged in modules can
possibly disable this setting.
Stereo/Mono/Bridge
slide switch to control the operating
mode:
stereo via the A and B-inputs,
mono and bridge mode via the A-channel
input connector only. Upside the switch
you will find a LED, which indicates the
switch is operating. Possibly inserted
modules can disable this switch too. If
so the LED will extinguish.
Low cut
in the 30Hz position the switch activates
a subsonic filter with a cut-off frequency
of 30 Hz and a 12 dB/octave slope.
Ground lift
slide switch for separating signal ground
from chassis ground. In any case the
chassis ground remains connected to
the protective earth (PE) connector of
the power cord.
Warning!
The protective earth conductor must
never be interrupted even for test
purposes! This may be dangerous to life!
Havarie in
When using the amplifier
as a redundant unit to
replace a defectice
amplifier in a HAVARIE
system, the input signal
coming from the HAVA-
RIE cards of the faulty
amplifier(s) will be send
to this western
connector. You can use
the western input
instead of the XLR-
inputs too.
!
Fig. 12 Havarie in
connector