PARK AUDIO RX Series Manuale utente
series
9d
FOUR CHANNEL PROFESSIONAL
SWITCHING POWER AMPLIFIER
Owner’s Manual
ACCESSORIES
1. Power Cord 1 pc.
2. Dust filter 2 pcs
3. Owner’s Manual 1 pc.
4. Warranty 1 pc.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION!
The amplifier runs on 230 V AC voltage. Removing the cover will expose you to a
potentially dangerous voltage! Do not use the unit if the electrical power cord is
frayed or broken.
Power is supplied from 230 V AC single-phase grounded 50/60 Hz source!
CAUTION!
To reduce the risc of fire or electric shock, do not expose the amplifier to rain or
moisture!
CAUTION!
The amplifier can yield dangerous output voltage! Do not touch the non-insulated
cable parts, connected to the unit in operation!
CAUTION!
The high sound pressure caused by the high output signal, applied to speaker
systems, may endanger your hearing. Please, take care to observe the required
safety precautions.
WARNING SIGNS:
Important information! Intended to warn the user about any important
information contained in this Owner’s Manual.
Hazardous voltage inside! Intended to warn the user about electric shock
hazard due to high voltage inside the product.
This sign next to the output terminals warns about dangerous voltage while in
operation.
22
GENERAL
The four-channel professional power amplifier RX9d is designed for sound signal
high-fidelity amplification within professional sound reproduction systems.
The amplifier is equipped with built-in DSP engine (DFM audio, Germany), which
provides the precision processing of the audio signal. To control the parameters of the
amplifier (or group of amplifiers) the program NetControl is used, the amplifiers are
connected via the ETHERNET interface.
To ensure faultless operation of amplifiers, please, take time to read this Manual
before use.
WARNING!
Make sure to take all precautions where required.
Please, follow all instructions and guidelines.
To avoid any risk of electrical shock and/or fire hazard, please, do not expose this unit
to rain or moisture. Do not use this unit near open water.
Use dry cloth to clean the unit.
Do not block fan vents.
Do not place the unit near heating radiators, furnaces or other heat-emitting devices.
Do not connect this unit to an ungrounded power supply line.
Protect the power cord against damage.
Disconnect the unit from power supply in case of thunder or during downtime.
In case of malfunctioning, caused by water or any other foreign matter inside or when
the unit has been dropped, or the power cord has been damaged, or the unit has
been found faulty, please, consult qualified personnel.
WARNING!
The amplifier yields high output power. The manufacturer shall not be held respon-
sible for any damage to the speakers caused by excessive power from the unit.
UNPACKING
The manufacturer’s quality control system provides for careful examination of each
product before it leaves the factory to ensure its flawless appearance. After unpacking,
please, check the unit for any physical damage. In case of damage, please, contact your
local dealer. Keep the shipping carton and all packing material, as you may require them
for reshipment of the unit.
3
DESIGN FEATURES
Physical Design
The amplifier is enclosed in a metal (steel) case of 2U height. The amplifier is
designed to be installed into a standard 19" rack.
The amplifier must be fixed at four points, when installed in the RACK 19 "(two points in
front and two at the rear).
Power Supply Unit
Two independent switch-mode PSU. Individual for each pair of channel.
Cooling System
Forced, cooling rate smooth adjustable system.
Two powerful fans. Backward air flow direction.
Dust Filter
Two removable filters are located on the front panel under protective covers.
Covers can be removed and installed without the use of any tools.
Power Amplifier Units
RX9d amplifier is based on a modern, high performance D class topology.
This topology provides high efficiency, low heat generation and large output power At
the same time, the high switching frequency of the output stage (450 kHz) provides sound
quality comparable with the best analog amplifiers.
Analog inputs
The amplifier is equipped with four balanced analog inputs (XLR female).
The use of balanced inputs provides for an essential reduction of the environment-
induced hum and noise interference with long input connecting cables.
For DSP processing, the analog signal is converted to digital using four 24-bit A/D
converters, operating at 96 kHz. The dynamic range of A/D and D/A converters is 120 dB.
AES inputs
Inputs of channels 1 and 2 can be switched to digital input mode.
A digital AES/EBU two-channel audio signal can be applied to each input. Sound
signals can be sent to an amplifier from a digital mixing console or other device, that
generates a digital audio signal AES/EBU (AES3). The AES/EBU inputs have balanced
transformers and are protected against static electricity. Built-in sample rate converters
support a wide range of input formats (16-24 bit / 44.1-192 kHz), converting any of them into
internal format 24bit / 96kHz.
ETHERNET connectors
Two equivalent ports for connection to the ETHERNET network.
Provide the ability to configure and remotely control the amplifier over a network, using
the NetControl software. The built-in router allows you to connect multiple amplifiers in
chain.
Line Outputs
Four XLR connectors (male).
Provide the possibility of parallel connection of several amplifiers, using standard
signal cables.
When analog input signal is used, the line outputs are connected in parallel to the
corresponding line inputs. When the digital input signal is used, the outputs are connected to
the corresponding inputs via buffer amplifiers.
DSP engine
The amplifier is equipped with a flexible and powerful high-end DSP from
DFM audio, Germany.
The close integration of processing and amplification allows the DSP to monitor and
better respond to amplifier behavior, making dynamics processing far more accurate and
effective than that typically achieved with separate components. The onboard DSP offers
four channels of crossover filters, parametric EQ, FIR filter and alignment delay – everything
needed to optimize a loudspeaker system.
Flexibly configurable RMS and PEAK limiters in each channel ensure reliable
loudspeakers overload protection.
DSP settings control is performed via ETHERNET, using personal computer with the
installed NetControl software.
For use in large installations, the processor has the tools for group control of many
amplifiers simultaneously. The amplifier can be supplied with pre-formed library of passive
speakers.
Software is designed for group control of a large number of amplifiers
simultaneously. The program provides the ability to create virtual systems, which can be
automatically merging with real amplifiers.
It is based on the work with Speaker and Preset libraries. The amplifier can be supplied
with pre-installed Speaker libraries. Also, the user can update the Speaker library or create
his own library. When creating a sound system, the user simply selects the desired type of
loudspeaker from the library.
The NetControl installation package and user manual can be downloaded from
parkaudio.ua (’’Downloads’’ section on the RX9d amplifier page).
User Interface
LCD display, LED indicators and controls (encoder and 4 buttons with illumination).
LED indicators on the front panel shows a signal presence, limiters activation and the
overload of each amplifier channel. Encoder, LCD and buttons provide local access to
navigation and DSP control.
Removable Power Cord
NEUTRIK powerCON 20A.
This feature is provided for convenience of transportation and rack mounting.
4
FUNCTIONAL FEATURES
Output Overload and Short-Circuit Protection
Individual per each channel. Protects the output stage of the amplifier units against
short-circuiting, as well as limits the output current, when a maximum-level sine signal is
applied continuously to 2-Ohms loudspeaker.
In case short-time overload (e.g. overload, caused by a sudden drop of complex load
impedance), the fast output stage protection system limits the output current to 60A.
In case of long-term overload (>0.5sec), the slow protection system limits the output
current to 40A.
In case of a short circuit, the protection system momentarily blocks the output of the
amplifier. The processor periodically tries to turn on the amplifier. If the short-circuit persists
for a long time, test attempts are made less often.
The protective system does not switch the amplifier off, so it resumes its unattended
operation after the short-circuiting conditions are gone.
Built-in to each channel microprocessor ensures safe operation.
DC Output Protection
Independent for each pair of channel. Prevents DC damage to loudspeakers.
The amplifier’s schematics precludes transit of any clicks or noise during the power-
on/off transition process.
Protection of loudspeakers against DC damage is ensured for each pair of channel by
individual power supply units which are disabled in the event of output DC voltage or any
powerful LF fluctuations. In case the protection system becomes active on all channels and
both power supply units become disabled, all indicators go off.
The amplifier can be restarted with the POWER toggle switch, by way of turning the
amplifier off and turning it on, about 2 minutes later again.
Thermal Protection
Individual for each channel. Protects the amplifier’s output stage against
overheating.
In case the temperature of the output stage transistors rises to 80°С, the CLIP LED of
the corresponding channel lights up. At the same time, the thermal protection system will
gradually reduce the signal level as the temperature increases. When the output stage
reaches 85°C, the thermal protection system will block the input and output stage of the
corresponding amplifier channel. After the temperature drops to 70°С , the amplifier
automatically resumes operation.
Soft Start
Reduces the power-on inrush current.
The soft start system is provided to reduce inrush current to the amplifier and to
minimize the noise contributed by the amplifier to the power mains during the poweron
process.
Soft Signal Start
Ensures smooth power-on sound signal rise.
During the power-on process, this feature ensures smooth gain from zero to the
maximum level to provide for a smooth rise of the sound level emitted from the
loudspeakers.
5
Overvoltage Protection System
Relay system. Used to protect the amplifier against overvoltage in the mains.
In case of accidental connection of the amplifier to incorrect-wired mains, the inter-
phase voltage of 400V may be applied to the amplifier. In this case the protection system
will block the mains connection to the power supply. Only the protection system stand-by
power supply unit remains in operation. The system activates, whenever the mains
voltage exceeds ~265V. The amplifier automatically resumes operation after the mains
voltage goes down to ~260V.
Microcontrol Monitoring
All amplifier protection systems are controlled by the microcontrollers, built into each
channel of the amplifier. Microcontrollers constantly monitor protection and control
systems, which increases the overall reliability and fault tolerance of the amplifier.
6
7
AMPLIFIER BLOCK DIAGRAM
1+
1+
2+
2+
1+
Ch1/AES1-2
INPUT
Power
amplifier
Ch 1
1+
2+
2+
THRU
THRU
Ch1, Ch2
OUTPUTS
TO SPEAKERS
Ch2
Ch 2
Ch 3
Ch 4
THRU
THRU
Ch3, Ch4
Ch4
Ch2/AES3-4
Ch 3
Ch 4
INPUT
INPUT
INPUT
DSP
8
FRONT PANEL
Dust filter cover grills.
POWER – выключатель питания усилителя.
SIGNAL LEDs indicating output signal on Channels 1... 4.
LIMIT – Channel 1,2,3 and 4 limiters activation LEDs.
CLIP – overload LEDs for channels 1, 2, 3 and 4.
Indicating overload and distortion occurence.
2 x 20 characters LCD display
DSP CONTROL – encoder knob for the menu navigation and parameters setting.
SEL/MUTE – channel selection for setting parameters/ mute corresponding channel.
1
2
3
6
7
8
1 1
4x2200 W
2 5
4673
8
5
4
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