Park Audio II V4-900 MkIII, V2-2400 MkIII, V4-1200 MkIII, V4-1800 MkIII, V4-2400 MkIII Owner's Manual
PARK AUDIO II, Ltd. Vinnitsa, Ukraine
www.park audio2.c om
e-mail: park@parkaudio2.com
PROFESSIONAL POWER AMPLIFIERS
V
-
series
V4-900 V4-1200 V4-1800
V4-2400
V2-2400
MkII I MkII I MkII I
MkII I MkII I
OWNER’S MANUAL
PARK AUDIO II
ACCESSORIES
1. Power Cord 1 ea.
2. Owner’s Manual 1 ea.
3. Warranty 1 ea.
Printed in Ukraine
32
TABLE OF CONTENTS
Page
General...........................................................................................................3
Unpacking....................................................................................................... 3
Design Features.............................................................................................4
Functional Features........................................................................................4
Block Diagram................................................................................................8
Front Panel.....................................................................................................11
Rear Panel......................................................................................................12
Input Module with Sensitivity Switch ...........................................................13
Input Module with Crossover ....................................................................... 14
Cabel Requirements .....................................................................................15
Input and Output Connectors .........................................................................16
Rack-Mounting Requirements.......................................................................17
AC Power Requirements ...............................................................................17
Operating Modes...........................................................................................18
Linking Up....................................................................................................... 21
Troubleshooting..............................................................................................27
Specifications .................................................................................................28
Operating Conditions....................................................................................30
Dimensions ....................................................................................................31
2 31
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION! The amplifier runs on 230V 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 230V AC single-phase grounded 50/60 Hz source.
CAUTION! The amplifier can yield dangerous output voltage! Do not touch the
non-insulated cable parts connected to outputs of the unit in operation!
CAUTION! The amplifier yields high output power. The manufacturer shall not be held
responsible for any damage to the speakers caused by excessive power from the unit.
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.
DIMENSIONS
445 max
40
37441
4
482
466
7
6
8
8
9
6
30 3
GENERAL
The V4-900 MkIII, V4-1200 MkIII, V4-1800 MkIII, V2-2400 MkIII, V4-2400 MkIII
power amplifiers (V - Series) are designed for sound signal high-fidelity amplification within professional sound reproduction systems.
To ensure faultless operation of the unit, please, take time to read this manual before
use.
ATTENTION!
The V 4-90 0 Mk III, V4-1 200 MkIII, V4-18 00 M kIII, V2 -240 0 Mk III, V4-2 400 M kIII
amplifiers have the same design and functiona l features and differ only in the
schematics elements, output power and weight. Unless specified o therwise, the
word “amplifier” hereinafter applies to any of the above models.
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 re-shipment of the unit.
OPERATING CONDITIONS
Air temperature: 5 ... 35°C
Atmos pheric pressure: 86.6 ... 106.7kPa (650 – 800 MMHG)
Rela tive humidity: less than 80%
4 29
DESIGN FEATURES
Physi cal De sign
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 incorporates:
– power supply source;
– two similar amplifying monoblock units;
– input module;
– indication and input level control unit.
The input module is replaceable.
Power Supply Source
Common for both channels. The power supply source consists of a soft-start unit, a
toroidal transformer, ac/dc converters and a filter capacitor PCB.
Cooling System
Fans are used to cool the output stage. The cooling system is independent for each
channel. The air flows backwards. The cooling intensity changes progressively in the
process of operation. On power-on and when the output power is fairly low, the fan runs at
a low speed thus minimizing the acoustic noise. As the output power goes up and so rises
the temperature of the output stage heat sinks, the fan starts blowing harder, thus
intensifying the cooling process.
Outp ut Stage
The output stage is designed with the use of complementary pairs of TOSHIBA bipolar
transistors. The output stage is based on Class H technology with double-level power
supply.
FUNCTIONAL FEATURES
Outp ut Short-Circui t Pro tec tion
The amplifier is provided with individual protection for each channel and global
protection in the bridge mode. The protective system does not switch the amplifier off, so it
resumes its unattended operation after the short-circuiting conditions are gone.
Overload Protection
The double-stage overload protection system provides both reliable output stage
protection and perfect sonic quality even under overload.
In case of a short-time overload lasting up to 3 msec., (e.g. overload caused by a
sudden drop of total load impedance), only the output stage current protection goes active
limiting the current running through the output transistors at the safe level. In this case the
protection system does not preclude the amplifier from delivering, for a short while, a full
output power (without any output voltage reduction) even to loads of very low impedance.
In case of a more continuous overload, the protection system activates the built-in
Clip-limiter, which reduces the level of the input signal and eliminates the distortion, caused
by hard clipping.
DC Ou tput P rotec tion
The amplifier schematics precludes any clicks or noise occurring during the poweron/off transition processes without utilizing any relay commonly used for connecting the
Frequency Response: 20 Hz . .. 20 kHz (0.2dB, Pnom.)
10 Hz .. . 60 kHz (1dB, 1W)
Total Harmo nic Distortion : 0.003 % (1kHz)
0.02 % (20Hz ... 20kHz)
Slew Rate: 40 V/µs (channel), 80 V/µs (bridge)
Damping Factor:
– V4-900MkIII, V4-12 00MkIII 400 (1kHz, 8Ohm)
– V4-1800 MkIII 400 (1kHz, 8Ohm)
– V2-2 400 MkIII, V4-240 0 MkIII 600 (1kHz, 8Ohm)
Channel Separation: 60dB (1kHz)
Signal-to-Noise Ratio: 100 dB (unweighted)
Input Impedance: 10 kOhm (balanced)
Sensitivity: 0.77 5V (standart model)
0.77 5V, 1.4V , 32dB ( * )
High-pass
Filter Cutoff Frequency**: 35Hz
High-Pass Filter Slope Rate**: 24dB/octave
Crossover Frequency***: 125 Hz
Power Requirements: ~230V AC, 50/60Hz
Weight:
– V4-900 MkIII 14kg
– V4-1200 MkIII 15kg
– V4-1800 MkIII 16kg
– V2-2400 MkIII 18.5kg
– V4-2400 MkIII 18.5kg
Dimensions:
– width 482mm
– height 96mm
– height in rack 2U
– depth 414mm
– depth in rack 374mm
* Only when an input module with a sensitivity switch is installed.
** Only when an input module with a sensitivity switch or with a crossover is installed.
*** Only when an input module with a crossover is installed.
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