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PRH-4240 - RH-4350
POWER AMPLIFIER
TABLE OF CONTENTS
1. Safety precautions - warranty
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2. General description
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3. Features
2
4. Nomenclature and functions
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4.1 front panel
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4.2 rear panel
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5. Speaker connections
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6. Specifications
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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 offers 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 off.
• Do not operate the device for a long time if the sound is distorted.
• Do not block the ventilation openings of the device.
