artsound PRH-4240 Power Amplifier User Manual

**artsound PRH-4240 Power Amplifier

**

Safety precautions

• Be sure to read the instructions in this section carefully before use.
• Make sure to observe the instructions in this manual as the conventions of safety symbols and messages regarded as very important precautions are included.
•  We also recommend you keep this instruction manual handy for future reference.

Warnings and safety.

Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property damage, which could result from mishandling. Before operating your product, read this manual first and understand the safety symbols and messages so you are thoroughly aware of the potential safety risk.

CAUTION
Indicates a potentially hazardous situation which, if mishandled, could result in death or serious personal injury.
CAUTION
Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage.

Warning

When Installing the Unit

• Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as doing so may result in fire or electric shock.
•  Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified may result in fire or electric shock.
•  Do not cut, kink, otherwise damage nor modify the power supply cord. In addition, avoid using the power cord in close proximity to heaters, and never place heavy objects — including the unit itself — on the power cord, as doing so may result in fire or electric shock.
•  Be sure to replace the unit’s terminal cover after
• Be sure to ground to the safety ground (earth) terminal to avoid electric shock. Never ground to a gas pipe as a catastrophic disaster may result.
•  Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slanted surface. Doing so may result in the unit falling down, causing personal injury and/or property damage.

When the Unit is in Use

• Should the following irregularity be found during use, immediately switch off the power, disconnect the power supply plug from the AC outlet and contact your nearest ArtSound dealer. Make no further attempt to operate the unit in this condition as this may cause fire or electric shock.
• If you detect smoke or a strange smell coming from the unit.
•  If water or any metallic object gets into the unit
•  If the unit falls, or the unit case breaks
•  If the power supply cord is damaged (exposure of the core, disconnection, etc.)
•  If it is malfunctioning (no tone sounds.)
• To prevent a fire or electric shock, never open nor remove the unit case as there are high voltage components inside the unit. Refer all servicing to your near-est ArtSound dealer.
• Do not place cups, bowls, or other containers of liquid or metallic objects on top of the unit. If they accidentally spill into the unit, this may cause a fire or electric shock.
•  Do not insert nor drop metallic objects or flammable materials in the ventilation slots of the unit’s cover, as this may result in fire or electric shock.
•  Do not block the ventilation slots in the unit’s cover. Doing so may cause heat to build up inside the unit and result in fire.
•  Do not operate the unit for an extended period of time with the sound distorting. This is an indication of a malfunction, which in turn can cause heat to generate and result in a fire.

An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the electrical installation of the building. Due to product upgrades, while some of the features and specification in the user manual does not
match the actual functions, sorry for any inconvenience and thanks for your kind understanding!Waste electrical products should not be disposed of with household waste. All electronic products with the WEEE logo must be collected and sent to approved operators for safe disposal or recycling. Please recycle where facilities exist. Many electrical/electronic equipment retailers facilitate “Distributor Take-Back scheme” of household WEEE. Check with your Local Authority or retailers for Designated Collection Facilities (DCF) where consumers may dispose of their WEEE free of charge.”

Warranty
Warranty terms of global three years. While the term and warranty may vary by country and may not be the same for all products. Terms and conditions of warranty for a given product may be determined first by locating the appropriate country which the product was purchased in, then by locating the product type.

General description

The PRH power amplifier is relying on a digital high ef-ficient class-D topology, featuring minimal power con-sumption, less excess heat and saving rack space com-pared to conventional analogue counterparts. The PRH amplifier contains four independent amplified channels, which each have a rated power of 240W for the PRH-4250 and 350W for the PRH-4350 respectively. For each channel there is a balanced line input by a phoenix terminal, a separate input gain control, and an optional high-pass cut off filter. For the outputs, each channel has a 100V as well as a low impedance (8Ω) output available. This makes the PRH range very versatile for a wide range of situations.A standby mode is automatically enabled when there is no signal on any input for more than one minute and is disabled immediately when there’s an input signal detected. The amplifier has a built-in protection mode, which kicks in in case of a short circuit or overload on the output, a DC error or an internal overtemperature issue. Visual status leds on the front panel are showing addi- tional information for each channel separately for easy supervision.The amplifier accepts an AC supply voltage from 115V to 230V, which makes it possible to employ worldwide.

Features

•  Switching power technology digital power amplifier
•  Class-D PA power amplifier of minimum power con-sumption
•  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 consump-tion
•  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

Nomenclature and functions

Front 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 indicated by the clip indicator (red). To resolve, just turn down the input gain of the affected 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/off the PRH amplifier.

Rear panel

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 transform-er) and always respect the polarity of the connection (see further).

3. Line input
   For each channel, there is a balanced line input by a phoenix terminal connector

4. Low impedance speaker output
   This output connection must be used for a low impedance (conventional, residential) speaker system. The rated impedance this amplifi er can drive is 8Ω. Always respect the polarity of the connection (see further).

5.   Gain control
   With the input gain control for each channel, it is possible to adjust the different input sources to match on the desired volume at the outputs.

6. High pass filter
   The high pass cut off filter can be enabled or disa-bled for each channel by a dipswitch.

7. Standby
   The automatic standby mode can be enabled or disa-bled 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.

Speaker connections

Before connecting the 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.

• Connecting 4-16Ω Speaker Systems
  When connecting conventional 4-16Ω speaker sys-tems, 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.

Specifications

References

• Speakers and multiroom systems webshop | ArtSound
• Support

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