KONAN LABS DA300 DA Series Digital Power Amplifier User Manual

KONAN LABS DA300 DA Series Digital Power Amplifier

Product Information

The DA Series Digital Power Amplifier is a professional digital amplifier designed for high-quality audio amplification. It is available in four models: DA300, DA500, DA800, and DA1000. This Class D audio amplifier offers outstanding voice intelligibility, a high signal-to-noise ratio, defined highs, a full mid-range, and powerful bass. It is suitable for various applications such as DJs, audio studios, hotels, conference rooms, multifunction rooms, and multimedia classrooms.

Key Features:

• Cost-effective and compact design
• Easy-to-operate
• Self-oscillating design type Class D power amplifier
• Orange LED indicator for power connection
• Smooth increase in volume upon switch-on
• Protection function for testing purposes
• Heat sink protection with temperature indicator

Product Usage Instructions

Front Panel:

The front panel of the amplifier features various controls and indicators:

1. Power switch
2. Volume control for Channel 1
3. Volume control for Channel 2
4. Signal level indicators

Rear Panel:

The rear panel of the amplifier includes the following connectors and features:

1. Channel A input: XLR Female connectors (Pin1=GND, Pin2=IN+, Pin3=IN-)
2. Channel B input: XLR Female connectors (Pin1=GND, Pin2=IN+, Pin3=IN-)
3. Working mode select switch: Stereo/Bridge mode
4. Hot Air Exhaust fans for cooling
5. Channel A link: XLR male connector for daisy chaining
6. Channel B link: XLR male connector for daisy chaining
7. Channel A output: Speakon connectors for power output
8. Channel B output: Speakon connectors for power output
9. IEC AC power cord for mains power supply

Signal Input and Output Connections:
To connect the amplifier to audio sources and speakers:

1. Use XLR cables to connect the audio sources to the Channel A and Channel B inputs on the rear panel.
2. Select the desired working mode using the Stereo/Bridge mode switch.
3. In Stereo mode, connect the output of both channels to the respective speakers using Speakon connectors.
4. In Bridge mode, apply the input signal to Channel A only and use the +1 and +2 output on a Speakon connector for bridged output. Do not connect Channel B input or output in Bridge mode.
5. For daisy chaining amplifiers, use XLR cables to connect the Channel A and Channel B link connectors on the rear panel.
6. Connect the speakers to the Channel A and Channel B outputs  using Speakon connectors.

Ensure proper power supply by connecting the IEC AC power cord to a suitable mains power source.

Thank you for purchasing this Class D audio amplifier. In order to take full advantage of this product, please keep this manual and refer to the operating instructions for detailed information.

Key features

The DA series is a very cost-effective, compact, easy-to-operate unit. Self- oscillating design type Class D power amplifier with outstanding voice intelligibility, an excellent S/N ratio, clearly defined highs, a full mid range and a powerful bass. It is ideal for DJs, audio studios, hotels, conference and multifunction rooms, multi-media classrooms, etc.
The DA series digital power amplifier design is upgraded from standard digital power amplifier, inherited the high reliability and wide applicability. The form of digital modulation circuit is equipped, which allows the tone quality to have a large dynamic range, high efficiency and low distortion. Bridge mode is also possible, which allows the amplifier to have strong applicability. The power supply adopted the advanced SMPS circuit design and APFC design, to provide a 100~240V universal applicable power supply with extremely high efficiency. The APFC power supply provides a circuit power factor up to 0.99.
Years of dedication on digital amplifier, enable successfully to develop a new circuit topology: the more complete digital signals are obtained after music signal adopting the new modulation mode. This new modulation mode ensures sampling of some extremely small signals and enriches sampling modes. In addition, the fixed switch frequency is greatly reduced, which allows the power amplifier to produce less heat and greatly enhance the efficiency. At the same time, the static power consumption is also reduced by a wide range.
The circuit protection has been carefully designed. As far as the short circuit problem is concerned, we solve an insurmountable difficult problem in this field of the industrial, high frequency short circuit judgment. Through a large number of experiments and improvements, we design a unique circuit to make the DA series power amplifier fully reliable. In addition, we dedicated on the study of power protection, current overloading protection, over-voltage protection, under-voltage protection, temperature control, DC protection, peak clipping, amplitude limiting, VHF protection and Automatic temperature control fan system.
Some characteristics of the DA series digital amp:

• When the amp’s power plug has connected to the AC power, the amp will lit an orange LED, to indicate the amp is power-connected.
• When switch on, the signal output has a smooth increase of the volume.
• When you want to test any protection function of the amp, please turn the amp to a big output, and test the protection function. Then you can see the protection function very obviously.
• When the heat sink of the Power-supply reaches a temp of 80C degree, protection led will lit; When the High-frequency transformer reaches a temp of 115C degree, the protection will lit; in case of protection active, please turn off the amp, wait 30 seconds and restart. If the amp can not recover, please don’t try to repair it and contact the manufacturer.
• Mute: the mute is recoverable.
  When the amp is in short-circuit, DC fault, the mute will lit. (during the DC fault, the output will completely cut, then gradually recover); When the heat sink of the amplification is overheated(reach 80C degree), the amp will lower the output automatically; when the temperature reach 90C degree, the whole amp will stop working in order to protect the amp. During overload, the mute will LED lit and have no output.

 Front panel

1. Installation hole
   Using this hole, the amplifier can be fixed in the rack easily.

2.  Power switch
   After the power is switched on, it takes approximately 3 to 4 seconds for the soft-start function to be executed, then the amplifier is ready to operate.

3. LED indicator of power on/stand-by

4. PROT
   This indicator lights up when the amp has some un-recoverable problem. At this time, the amp must be turned off firstly, and then check the reason.

5. MUTE
   This indicator lights up when the signal is mute due to output short-circuit, DC protection or over temperature on heat sink.

6. Exit for hot air flow:
   This air flow comes from the front and goes through the rear fans and exits.

7. Channel 1 and 2 volume knob:
   These potentiometers are used to control the input volume of the amplifier.

8. Channel A and B output signal CLIP indicators (red LEDs):
   When the output signal voltage is too high, these LEDs light up.

9. Signal indicators:
   It indicates that the output level of the amplifier is around -24db, related to the maximum power.

Rear panel

DA300/DA500/DA800/DA1000 rear panel:

• (1/3) Channel A and B input: XLR Female connectors
  Using a standard XLR:
  Pin1: ground Pin2: positive Pin3: negative

• (2) Working mode select: Stereo/ Bridge mode switch
  Stereo Mode: You have to connect the input and output of both channels.
  Bridge Mode: The input signal must be applied to CH A only: and +1, +2 is the output of Bridge mode on a Speakon. Do not connect channel B input or output on Bridge mode.

• (4/7/10) Hot Air Exhaust:
  The cold air intakes the amplifier from the front, cooling the internal heat sinks, and exits by the 4/7/10 fans. (5/6) Channel A and B Link : XLR male connectors
  Using a standard XLR for connecting another amplifier in daisy chain
  Balanced: Pin1: ground Pin2: positive Pin3: negative

• (8/9) Channel A and B output: Speakon connectors. Power output

• (11) IEC AC power cord for mains power supply

Safety instructions

Caution: To reduce the risk of electric shock, do not remove the cover or rear panel. No user-serviceable parts inside. Servicing must be carried out by qualified service personnel.

The lightning symbol in the triangle indicates insinuated components inside the housing with hazardous voltages that can cause injury to persons.
The exclamation mark in the triangle indicates important operating and maintenance (servicing) instructions that are provided in the documentation accompanying the unit.

• Caution: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside.
• To avoid the risk of fire or electric shock, do not expose the unit to rain or moisture. Do not allow metal objects or liquids to come into contact with the unit, since electric shock or malfunctions may result.
• Do not cover any ventilation slots, as this may result in overheating. Always install the unit in a well-ventilated location. Ensure that the unit is not close to any heat source, and avoid dusty and moist environments.
• Do not attempt to repair the unit yourself. Maintenance checks and repairs must be carried out only by qualified personnel.

Precautionary measures and cautions

Ensure that the power switch is switched off before connecting the cables to install the unit.
Ensure that the mains power supply corresponds to the rated voltage of the unit.
Ensure that there is an adequate source of power; do not switch on several amplifiers at the same time.
Ensure that all connectors are correctly and securely connected.
Ensure that the input level (volume) controls are set to the lowest level (to the left) before the power is switched on.
If the amplifier malfunctions, switch it off immediately. Do not attempt to repair it yourself; contact your dealer for service.
Cautions for testing with sine wave/ measuring the specifications :
When testing the parameters of the DA series amplifier with audio analyzer equipment like Audio Precision, an electrical filter must be added between the output of the DA series amplifier & the audio analyzer. The electrical filter is used to filter the ultra-high switching frequency. The switching frequency will affect the precision of the testing results.
When testing the THD, S/N ratio and other parameters with sine wave signal, the output should be adjusted to 1/8 RMS output. This is the standard testing.
When using the oscilloscope to check the waveform of the DA series amplifier, some “hairs and shadow” things will be seemed, but these “hairs and shadow” are not distortion. They are the switching frequency, because the DA series is designed with self-oscillating type.

Signal input connectors

CHA & CHB Input & Link
Fig. 1 is input male XLR, one can use it to link to another amplifier
Pin1= Ground ; Pin 2= Signal + ; Pin 3= Signal –

Attention: Improper connections will result in malfunctions. Ensure that connections are correct before beginning operation.

 Signal output connectors

Fig. 2: Signal output via Speakon connectors for Stereo mode Channel A :
1+ Connect signal output to (+) speaker
1- Connect signal output to (-) speaker
2+ Do not used
2- Do not used
Channel B :
1+ Connect signal output to (+) speaker
1- Connect signal output to (-) speaker
2+ Do not used
2- Do not used

Fig. 3: Signal output via Speakon connectors for Bridge mode Channel A :
1+ Connect signal output to (+) speaker 1- Not connected
2+ Connect signal output to (-) speaker 2- Not connected
Channel B :
1+ Not connected
1- Not connected
2+ Not connected
2- Not connected

Attention: Improper connections will result in malfunctions. Ensure that the connections and operating mode are correct before switching on the power.

Operating instructions

Operating procedures:

• Connect the unit to appropriate speakers.
  Get sure that the result of impedance of the speaker systems connected is not lower than 4 Ohms on each channel when working in Stereo mode, 8 Ohms in Bridge mode.

• Ensure that all input and output connections are correct and secure.

• Ensure that the mains power supply corresponds to the rated voltage indicated on the amplifier.

• Connect the signal source, e.g. mixing console, to the signal input of the amplifier.

• Set the input level (volume) of the amplifier to the lowest setting.

• First switch on the power for the signal source, e.g. mixing console, then switch on the power for the amplifier.

• Adjust the input level (volume) to the desired volume.

Maintenance

1. Clean the unit by wiping it with a slightly damp cloth. Do not permit moisture to enter the unit. Do not use alcohol or any volatile liquid cleansers that may damage the unit.
2. Clean the ventilation slots regularly with a vacuum cleaner. This maximizes cooling by the amplifier fans and helps to prevent overheating.

Troubleshooting

In the event of operating problems, first check the causes described below before requesting assistance.

to the mains supply before switching on the amplifier power switch.
Blown fuse (Internal)| Turn off the power and check the internal fuse. If the fuse has blown, always replace it with the same type of fuse.

No sound

| No input signal| Connect the signal source to the amplifier input, then turn on the power.
Loose speaker connection or malfunctioning speaker| Ensure    that    the speaker    is    securely connected. Check to see that the speaker is in good operating condition.
Incorrect connection| Ensure    that    the    speaker    is    correctly connected to the amplifier.
protection| Avoid overloading the amplifier for prolonged periods. Do not attempt to operate the amplifier in a poorly ventilated location. Check to see that the cooling fans are operating properly and that the ventilation slots are free of dust.

Inadequate output volume

| The signal input level (volume) is set to the lowest level|  Adjust the signal input level to the desired volume.
 Output of the signal source, e.g. CD player, is too low|  Increase the output of the signal source, or adjust the input level of the amplifier.

Specifications

Disposal of This Product

Correct Disposal of This Product (Waste Electrical & Electronic Equipment) (Applicable in the European Union and other European countries with separate collection systems)
This marking shown on the product or its literature, indicates that it should not be disposed with other household wastes at the end of its working life. To prevent possible harm to the environment or human health from uncontrolled waste disposal, please separate this from other types of wastes and recycle it responsibly to promote the  sustainable reuse of material resources.
Household users should contact either the retailer where they purchased this product, or their local government office, for details of where and how they can take this item for environmentally safe recycling.
Business users should contact their supplier and check the terms and conditions of the purchase contract. This product should not be mixed with other commercial wastes for disposal.

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