SCP Audio A4400 A4 Series Professional Class D Four Channel Amplifier User Manual

A4400 A4 Series Professional Class D Four-Channel Amplifier

A4400 A4 Series Professional Class
D Four-Channel Amplifier
User Manual

Caution: Please read this manual carefully before operating
Damage caused by misuse is not covered by the warranty

SAFETY WARNINGS!

1. Read and keep these instructions.
2. Heed all warnings and follow all instructions.
3. Do not use this apparatus near water.
4. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
5. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
6. Do not defeat the safety purpose of the polarized or grounding-type plug. If the provided plug does not fit into your outlet, consult an electrician for replacement.
7. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
8. Only use attachments/accessories specified by the manufacturer.
9. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury.
10. Unplug this apparatus during lightning storms or when unused for long periods of time.
11. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
12. This appliance shall not be exposed to water and that no object filled with liquid such as vases shall be placed on the apparatus.
13. Plug this apparatus into the proper wall outlet and make the plug easily removable.
14. WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
15. An appliance with a protective earth terminal should be connected to a mains outlet with a protective earth connection.

WARNING!

TO PREVENT FIRE OR SHOCK HAZARDS, DO NOT USE THE PLUG WITH AN EXTENSION CORD, RECEPTACLE, OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
TO PREVENT ELECTRICAL SHOC K, MATCH THE WIDE BLADE PLUG TO THE WIDE SLOT, AND FULLY INSERT.

**The lightning flash with the arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage’ within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
** The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

INTRODUCTION

Description
The A series four-channel power amplifiers are designed for professional audio applications and fix installations, while the digital class-D technology helps the amplifiers generate powerful output while keeping less heat because of its high efficiency, up to 85%. The power amplifier is designed with a special PWM power supply to ensure extreme stability, less noise, and minimum heat. Its rated power from 4×200W, 4×300W, and 4×400W at stereo 8Ω, the amplifier support 8Ω & 4Ω and has a versatile mode of stereo, parallel, and bridge making it work well with professional speakers and subwoofers.
With complete protection of clip, high temp, overload, and short circuit to ensure these amplifiers work under severe working environments.

Features

• Switching power technology digital Class-D power amplifier
• Green technology amplifier with 85% efficiency
• With PWM special power circuit to ensure an excellent cooling system
• 19” universal rack mount type in 1U height
• Support stereo output at 8Ω & 4Ω
• Output mode selector of stereo, parallel, and bridge
• 4×Input by balanced XLR male connector
• 4×Output by balanced Speakon female connector
• Complete protection includes a clip, high temp, overload, and short circuit

FRONT PANEL

1. CH1 volume knob
2. CH1 protect, clip & signal indicators
3. Bridge, stereo & parallel indicators
4. CH2 protect, clip & signal indicators
5. CH2 volume knob
6. Power indicator| 7. CH3 volume knob
8. CH3 protect, clip & signal indicators
9. Bridge, stereo & parallel indicators
10. CH4 protect, clip & signal indicators
11. CH4 volume knob
12. AC power switch
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REAR PANEL

Male XLR-3P: Pint-Ground Pin2-Positive signal Pin3- Negative signal

AMPLIFIER OPERATION GUIDE

Setup
Before operating the A series amplifiers, check the mains supply voltage and connect the IEC inlet to the mains power supply using the power lead supplied (or equivalent). Ensure that the cooling vents at the front and rear are not covered or obstructed in any way with adequate space for airflow through the unit.
Each side of the A series amplifiers can be operated as an independent pair of channels or as a single combined output in Bridge mode. Set the mode using the selector switch for the relevant pair of channels (rear panels 7 & 10).
Bridge mode offers the option of operating the A series as a stereo amplifier into 2 larger 8Ω speakers.
It is also possible to operate one side in Bridge mode to give 1 high output channel with the other side in stereo, which can be useful to power a large sub and a pair of satellite speakers (left + right).

Standard dual stereo or quad mode
Connect speakers to Channel 1, 2, 3, and 4 outputs via the SPK connectors (rear panel 2, 3, 4 & 5) For standard output mode SPK wiring, connect + and – wires to pins 1+ and 1- (the most common configuration) Ensure that the combined load on each channel is no lower than 4Ω (for speakers in parallel, 8Ω + 8Ω = 4Ω) Connect line-level inputs to the CH 1, 2, 3 and 4 XLR inputs (rear panel 6, 8, 9 & 11) Each output is governed by its own channel gain control on the front panel.
Bridge mode
Bridge mode is different to the standard mode in that it combines 2 of the output channels into a single mono output.
This mode enables double the power to a single speaker output compared with the standard mode.
The difference is that the speaker load must be no lower than 8Ω, whether a single speaker or combined load.
Bridge mode can be useful, especially when driving a large, high-power subwoofer.
Connect the speaker(s) for Bridge mode to the Channel 1/3 SPK output(s).
Note that the SPK wiring in Bridge mode is different from the standard mode.
Connect the “+” speaker wire to amplifier 1+ (rear panel 5) and the “–” speaker wire to amplifier 2+ (rear panel 5).
Note: For reference, this wiring is printed on the rear panel. Incorrect speaker wiring can damage the amplifier!
In Bridge mode, CH 1 and 3 XLR inputs send a mono signal to the CH 1 and 3 SPK outputs (pins 1+/2+)

Operation
With channel gain controls (front panel 1, 5, 7, 11) turned fully down (anti- clockwise), switch on the power (front panel 12) and the LED POWER indicator will light (front panel 6)
Placing the input signal into the connected channel inputs, gradually increase the relevant gain controls (only CH 1 and 3 will have an effect in Bridge mode). The amplified signal should be heard through the speakers and the SIG indicators (front panels 2, 4, 8, 10) should respond to the audio output. Increase the volume controls to the required level.
Alongside the SIG indicators are CLIP indicators, which should only light very briefly on the loudest transients or spikes in the audio. If the CLIP LEDs light for more than a fraction of a second at a time, the volume controls should be turned down or the input signal will need to be reduced.
Before powering down, turn down the volume controls to avoid loud pops or noises through the speaker.

SPECIFICATION

TROUBLESHOOTING

No power light on the front panel switch| Ensure the IEC inlet is connected to mains and the lead is in good condition
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Ensure the mains outlet is switched on
The power light is on but no other LEDs and no output| Check input signal and connection leads
Ensure channel gain controls are not turned fully down
The power light and Signal LEDs are lit but no output| Check speaker leads are in good condition and connected properly
If speakers/leads OK, switch off again and refer to qualified service personnel
Check speakers are in good working order and not shorted (use a multi-tester)
Case getting hot| Ensure cooling vents are clear and the fan is working (refer to the technician if not)
Output is very distorted and CLIP LEDs are lighting| Check the speaker impedance is not below the rated Ohms
Turn down the input level from the audio source
Turn down channel gain controls
Output is working but at the very low level| Ensure input source is at line level
Increase input level from the audio source
Turn up channel gain controls

SERVICE

Procedures
Ensure the problem is not related to operator error or system devices that are external to this unit. Information provided in the troubleshooting portion of this manual may help with this process. Once it is certain that the problem is related to the product contact your warranty provider as described in the warranty section of this manual.
Variations and Options
Variations
Products supplied through legitimate sources are compatible with local AC power requirements.
Options
No optional items are available for this product.
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 in which the product was purchased in, then by locating the product type.

Specifications may change without notice.
www.scpaudio.com

References

• Sound Choice Pro Audio - Australia

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