Page 4
High Power Amplifier P
RO
A 2000
1. Basic Information
The K+H P
RO
A 2000 is a highest performance
class AB high power amplifier. Most sophisticated
protection functions and high power reserves make
this amplifier the first choice for all applications.
Special features are: built in versatile limiter, which
can be disabled in part, 3 slots for expansion modules
such as controller for switching over to a redundant
power amplifier in case of failure (HAVARIE), remote
control, remote diagnosis, audio controller, parametric
2-band EQ, add on digital audio input interface and
high performance balancing input transformers. 100/
70 V output transformers are available as separate
units.
Basicly the P
RO
A 2000 is designed for 4 Ohms load
impedance under hard conditions too, but dependant
on environmental effects and audio material, it can
drive loads down to 1.8 Ohms without loss in
performance. Safe operation of the amplifier itsself
and the connected speakers under all conditions and
faults is secured by costly protection circuits. Before
switching off the amplifier or the speakers, these
circuits try to go back to a safe operation condition in
reducing the output power by means of the thermal
and current limiters. This is very smoothly done and
without increasing THD. Not before these steps will
not do there will be a switch off. If any high frequency
(e. g. feedback to preamplifier) or DC-signals are
detected at the power output, the protection circuit
switches off both amplifier and speaker outputs
immediately.
2. Installation
2.1 It is absolutely essential that you read
and observe the Safety Instructions on
page 2 before connecting or using this
device.
2.2 Operating conditions
The K+H model P
RO
A 2000 high power amplifier is
intended for use over a range of ambient temperatures
from +10° C to +40° C (+50° F to +104° F). During
transport or storage, temperatures from -25° C to +70°
C (-13° F to 158° F) are permissible.
2.3 Rack Installation
When installing the P
RO
A 2000 to a rack it is
recommended to use sidewise bearings. In any case
the rear fastening angles have to be fixed to the rack
too.
Warning!
Because of the heavy weight the front
panel alone cannot carry the P
RO
A 2000!
Please take care of sufficient ventilation
at both sides of the amplifier see figure 3:
Fig. 3 P
RO
A 2000 airflow
2.4 Cooling
The P
RO
A 2000 is equipped with a most efficient push-
pull cooling system, which allows for sustained
continous operation at a 4 Ohms load. So the P
RO
A
2000 can be operated under hard conditions without
any air conditioning. Of course the ventilation in the
rack has to be sufficient.
The cooling air is drawn in at both sides and the cover
plates on top and bottom of the cabinet. For even
better cooling you can leave one unit above and one
under the amplifier blank.
The outlet air is blown out on the front panel.
2.5 MAINS Connection
The amplifier electronics of the standard European
model are set up for an AC line voltage of 230 volts,
50 or 60 Hz. Export versions with other voltages are
also available. If the power plug of the mains cable
should ever need to be replaced, ensure that the
connection to the protective earth is maintained.
2.6 MAINS Switch (POWER)
The mains switch is a 3-positon
rocker type. Shortly pushing the
upper end (ON) will power up the
P
RO
A 2000. After a 5 second on
delay it will be ready and the mains
LED will light up. Pushing the lower
end (OFF) will interrupt mains
power. If a remote control module is present and set
in function, all amplifiers in a set can be powered on
!
Fig. 4 Mains switch