ART+SOUND PRH-4240 User manual

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PRH-4240 - RH-4350
POWER AMPLIFIER
TABLE OF CONTENTS
1. Safety precautions - warranty 1
2. General description 1
3. Features 2
4. Nomenclature and functions 2
4.1 front panel 2
4.2 rear panel 2
5. Speaker connections 3
6. Specifications 4
OPERATING MANUAL
2. GENERAL DESCRIPTION
The PRH power amplifiers are built on Class D technology. With minimal power consumption, less heat genera-
tion and a more compact size than conventional analogue amplifiers.
The PRH power amplifiers contain four independent amplification channels, each rated at 240W (PRH-4240)
and 350W (PRH-4350) respectively. For each channel, there is a balanced line input via a Phoenix connector, a
separate input gain control and an optional high pass filter.
Both 100V and low impedance speaker outputs are available.
This allows the PRH amplifiers to be used in most situations.
A standby mode is automatically activated when no input signal is detected for more than 1 minute.
Furthermore, there is a built-in protection mode that oers protection in case of short-circuit, overload or
excessive temperature.
The coloured LEDs on the front panel provide an easy overview of the operation. The amplifiers operate on an
AC voltage of 115V to 230V and can also be supplied with DC24V emergency power.
1. WARNINGS AND SAFETY
• To prevent fire or electric shock, do not expose this device to rain or moisture.
• Do not repair any parts inside the unit, but leave all repairs to qualified service personnel.
• As long as the mains cable of the machine is connected to a wall socket, the machine is live, even if the
machine is switched o.
• Do not operate the device for a long time if the sound is distorted.
• Do not block the ventilation openings of the device.

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PRH-4240 / PRH-4350
• Switching power technology digital power amplifier
• Class-D PA power amplifier of minimum power
consumption
• Less rack space and less heat generation
• Four channel power amplifier into 19” rack mount
unit
• Rated power output at 120W, 240W, 350W to 500W
by four channels
• Four channel separate speaker outputs 4-16Ω/100V
• Balanced XLR input by phoenix connector for four
channels
• Each input with separate gain control.
• Each four channel with high-cut filter.
• Built-in auto standby feature to save power con-
sumption
• Separate four channel indicators for protection, clip,
input and output
• Complete short circuit, overload, high temp, clip and
DC protection
• Wide AC input from 110V to 230V
3. FEATURES
4. NOMENCLATURE AND FUNCTIONS
4.1 FRONT PANEL
4.2 REAR PANEL
  




1. Protection
The protection mode kicks in in case of a short
circuit or overload on the output, a DC error or
an internal overheating issue. If this is the case,
the protection indicator will be permanently lit
(orange).
2. Clipping
In case the input signal is too high, the amplifier
is literally driven to its limits and hence can no
longer reproduce the signal undistorted. When
this is the case for any channel, this will be indi-
cated by the clip indicator (red). To resolve, just
turn down the input gain of the aected channel
a slight bit.
3. Input
The input indicator will lit up (green) whenever
there is an incoming signal detected for the
respective channel.
4. Output
The input indicator will lit up (green) whenever
there is an outgoing signal for the respective
channel and basically shows the amplifier is in its
normal working state.
5. Power
When the unit is powered, the power indicator will
be permanently lit (blue).
6. Power switch
The power switch is used to power on/o the PRH
amplifier.
 
 



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PRH4240 / PRH4350
1. AC power cord
The amplifier accepts an AC supply voltage from
115V to 230V, which makes it possible to use
worldwide with the corresponding power lead.
2. 100V speaker output
This output connection must be used for a 100V
speaker system. Only connect speakers to this
that are compatible for 100V (with an internal
transformer) and always respect the polarity of the
connection (see further).
3. 3. Line input
For each channel there is a balanced line input by
a phoenix terminal connector
4. 4. Low impedance speaker output
This output connection must be used for a low
impedance (conventional, residential) speaker
system. The rated impedance this amplifier can
drive is 8Ω. Always respect the polarity of the con-
nection (see further).
5. Gain control
With the input gain control for each channel, it is
possible to adjust the dierent input sources to
match on the desired volume at the outputs.
6. High pass filter
The high pass cut o filter can be enabled or
disabled for each channel by a dipswitch.
7. Standby
The automatic standby mode can be enabled or
disabled for each channel by a dipswitch. Standby
mode is automatically enabled when there is no
signal on any input for more than one minute and
is disabled immediately when any input signal is
detected.
8. DC 24V emergency power input
5. SPEAKER CONNECTIONS
• Connecting 4-16Ω Speaker Systems
When connecting conventional 4-16Ω speaker
systems, connect the speaker’s positive (+) side to
the terminal labeled 4-16Ω. Connect the speaker’s
negative (-) side to the terminal labeled COM.
• Connecting High-Voltage Distributed Speaker
Systems
When connecting a low-impedance (100V) speaker
system in parallel, connect the speaker’s positive (+)
side to the terminal labeled 100V.
Connect the speaker’s negative (-) side to the
terminal labeled COM.
Before connecting speakers, disconnect the AC power cable. Note the proper connecting terminals as shown
below. Make sure that the total impedance is not less than the rated impedance indicated.
100V
- +
COM 8Ω
8Ω
100V
- +
COM 8Ω
100V
100V
- +
COM 8Ω
8Ω
100V
- +
COM 8Ω
100V
FOR 100V SPEAKER WITH TRANSFORMER
CONNECTION
FOR 8Ω LOW IMPEDANCE SPEAKER CONNECTION

House of Music nv, Schoonboeke 10, BE-9600 Ronse
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PRH-4240 / PRH-4350
10. WARRANTY CONDITIONS
2 year warranty from date of purchase. The warranty is limited to the repair of replacement of the defective
material insofar as this defect is a result of normal use and the device has not been damaged. Artsound is not
responsible for any other costs that ensue as a result of the defect (e.g. transport). For details, please consult our
general terms and conditions of sale.
This product bears the selective sorting symbol for waste electrical and electronic equipment (WEEE).
This means that this product must be handled pursuant to European Directive 2002/96/EC in order to
be recycled or dismantled to minimize its impact on the environment.For further information, please
contact your local or regional authorities.
I, House Of Music NV, hereby declare that the type of radio equipment ARTSOUND complies with Direc-
tive 2014/53/EU. The full text of the EU Declaration of Conformity can be found at the following internet
address: http://www.artsound.be/en/support/downloads
6. TECHNISCHE KENMERKEN
Model PRH-4240 PRH-4350
Description Class-D Four Channel Power Amplifier
Rated power output 4 x 240W 4 x 350W
Speaker outputs 8Ω & 100V
Frequency response L/H Cut OFF 20Hz-20KHz (+1/-2dB)
L/H Cut ON 70Hz-10KHz (+1/-3dB)
Input 0.775V, 0dBu, balanced phoenix connector by four channels
Input Impedance 10KΩ
T.H.D <0,1% (1KHz/-3dBv, 100 W)
S/n ratio > 80dB
Crosstalk > 60dB, 1KHz, Max output
Power consumption 120W 1750W
Power Supply AC input 110V-230V, 50-60Hz, DC24V emergency power input
Dimension (mm) 482(b)x420(d)x44(h) mm
Weight 9kg 9,5kg
Disclaimer: All trademarks are the property of their respective owners. All specifications and information are
subject to change without further notice. Slight variations and dierences might appear between printed photos
and actual product due to product enhancement.
House Of Music NV - Schoonboeke 10 B-9600 Ronse - Belgium