SEIKAKU A150.2 Switching Power Professional Amplifier User Manual
- June 16, 2024
- SEIKAKU
Table of Contents
SEIKAKU A150.2 Switching Power Professional Amplifier
IMPORTANT!
Please read this manual carefully before operating this unit for the first time.
TECHNICAL SPECIFICATIONS
SAFETY RELATED SYMBOLS
- The symbol is used to indicate that some hazardous live terminals are involved within this apparatus, even under the normal operating conditions.
- The symbol is used in the service documentation to indicate that specific component shall be only replaced by the component specified in that Documentation for safety reasons.
- Protective grounding terminal.
- Alternating current /voltage.
- Hazardous live terminal.
- ON: Denotes the apparatus turns on.
- OFF: Denotes the apparatus turns off, bec-ause of using the single pole switch, be sure to unplug the AC power to prevent any electric shock before you proceed your service.
- WARNING: Describes precautions that should be observed to prevent the danger of injury or death to the user.
Disposing of this product should not be placed in municipal waste and should be separate collection.
CAUTION: Describes precautions that should be observed to prevent danger of the apparatus.
WARNING
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Power Supply
Ensure the source voltage matches the voltage of the power supply before turning ON the apparatus. Unplug this apparatus during lightning storms or when unused for long periods of time. -
External Connection
The external wiring connected to the output hazardous live terminals requires installation by an instructed person, or the use of ready-made leads or cords. -
Do not remove any Cover
There are maybe some areas with high voltages inside, to reduce the risk of electric shock, do not remove any cover if the power supply is connected. The cover should be removed by the qualified personnel only. No user serviceable parts inside. -
Fuse
To prevent a fire, make sure to use fuses with specified standards (current, voltage, type). Do not use a different fuse or short-circuit the fuse holder. Before replacing the fuse, turn OFF the apparatus and disconnect the power source. -
Protective Grounding
Make sure to connect the protective grounding to prevent any electric shock before turning ON the apparatus. Never cut off the internal or external protective grounding wire or disconnect the wiring of the protective grounding terminal. -
Operating Conditions
This apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on this apparatus. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Do not use this apparatus near water. Install in accordance with the manufacture-r’s instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including am-plifiers) that produce heat. Do not block any ventilation openings. No naked flame sources, such as lighted candles, should be placed on the apparatus.
IMPORTANT SAFETY INSTRUCTIONS
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Read these instructions.
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Follow all instructions.
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Keep these instructions.
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Heed all warnings.
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Only use attachments/accessories spec ified by the manufacturer.
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Power Cord and Plug
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Do not defeat the safety purpose of the polarized or grounding-type plug.
A polarized plug has two blades with one wider than the other. A grounding- type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replace-ment of the obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. -
Cleaning
When the apparatus needs a cleaning, you can blow off dust from the apparatus with a blower or clean with rag etc. Don’t use solvents such as benzol, alcohol, or other flu ids with very strong volatility and flammability for cleaning the apparatus body. Clean only with dry cloth. -
Servicing
Refer all servicing to qualified personnel. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so . Servicing is required wh en 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. The mains plug is used as the disconnect device, the disconnect device shall remain readily operable.
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BLOCK DIAGRAM
INTRODUCTION
The A150.2 / A300.2 switching power professional Amplifier is designed for professio nal use o n stage. The high-quality components and the carefully designed circuits ensure excellent audio performance and an extremely linear frequency response. In fact, the switching technology offers, together with an increased efficiency and a better control of heat dissipation than conventional power supply systems, a drastic reduction of dimensions and weight, for easier transportation and installation. This Amplifier guarantees total reliability and a trouble-free use even in the most demanding conditions. We believe the A150.2 / A300.2 will provide a perfect performance, what you get is unprecedented performance at an incredibly attractive price.
Features
- High current switching power allows high power output with low noise and low distortion
- Substantial protection circuitry like thermal, short circuit, power o n/off mut ing and Therefore protection
- Built-in limiter
- Balanced XLR-TRS combo input jack
- 1/4″ TRS jack and Speakon output connectors
- Front-mounted gain controls for easy access
- Signal, Clip protect, and Power LED indicators to monitor performance.
CONTROL ELEMENTS
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Power Switch
It switches ON/OFF the unit main power. -
Level Control
These volume controls allow you to adjust the volume level. -
Power/Prior LED
The Green LED light up when the amplifier power on. The Red LED light up when the amplifier input priority. -
Signal LED
These green LEDs light up when the respective channel’s output signal pass through. -
Protection LED
In normal operation, the LED will not illume; If the LED turns red, it means the unit is in hea t protection without sound output. The speaker system is actually disconnected from the amplified output s when this LED is red, the temperature must be reduced by good ventilation and the signal level decreased etc, if the problem is resolved. the protection output systems will deactivate automatically, and normal amplifier operation is resumed. -
Clip LED
This red LED lights up when the input signal is too strong. it is time to reduce the input level until clip LED turns off. -
Air Intake Vents
A150.2/A300.2 employ a variable speed internal cooling fan to intake the air through the front grill to keep it running cool even under extreme operating conditions. Please keep these vents clear and free from obstruction at all times to insure proper cooling. -
Bridged LED
The Bridged LED light up when the amplifier is in Bridged Mode.
WIRING CONNECTIONS
Patching two bridge mono mode system
Two bridge mono amplifiers can be patched together (operated in mono mode) by connecting signal cable between their input jacks. The signal smart switch must be set to the bridge position.
SWITCH SET TO BRIDGE
REAR PANEL
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AC Input
Use it to connect your A150.2/A300.2 to the supplied AC cord. -
Channel 1 XLR Input
This XLR jack will accept any balanced or unbalanced low impedance line level source by means of a three-pin XLR plug. The wiring for the plug is as follows: Pin1=Ground, Pin2=Signal+, Pin3= Signal-. -
Channel 1 TRS Input
This TRS(1/4′) jack will accept line level signal sources by means of cables fit with standard 1/4″ phone plugs. This input are compatible with balanced and unbalanced low impedance, and high impedance sources. Low impedance balanced input is to be wir ed as fol lows: Tip=signal+, R ing= signal-, Sleeve=Ground. -
Channel 2 XLR Input
This XLR jack will accept any balanced or unbalanced low impedance line level source by means of a three-pin XLR plug. -
Channel 2 TRS Input
This TRS(1/4′) jack will accept line level signal sources by means of cables fit with standard 1/4″ phone plug. -
Signal Smart Switch
Use this switch to select the operating mode of the amplifier. The switch functions as follows:- STEREO: input 1 to CH 1 amp, input 2 to CH 2 amp; BRIDGE: input 1 to Mono Bridge amps.
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Channel 1 Speakon NL-4R
Connect the amplifier to your speakers using these speakon jacks. -
Channel 1 TRS (1/4″) jack
Connect the amplifier to your speakers using these speakon jacks. -
Channel 2 Speakon NL-4R
Connect the amplifier to your speakers using these speakon jacks. -
Channel 2 TRS (1/4″) jack
Connect the amplifier to your speakers using these speakon jacks. -
Limit Switch
Control the built-in limiter on/off. -
Exhaust Vents
Air is drawn from front grilles, flown through the unit and heat sink, and then exhausted via the rear vents. Do not block or impede the air flow through these vents and keep the vent areas free of foreign materials.
APPLICATIONS
Stereo Operation
A150.2/A300.2 can be used in the stereo mode as two separate 300/600 watt units, e ach capable of driving loads down to 4 ohms. Each channel operates independently and has its own input connectors,sensitivity level controls, signal indicator LEDs, automatic limiter, fault protection circuitry, power amp, and speaker outputs. In the stereo mode, the signal smart switch must be set to the stereo position.One application of the stereo mode uses one channel of the amplifier for the left house speakers and the other channel for the right. The mixing board channels can be panned left or right according to the position of the instruments on the stage. This approach provides a more accurate reproduction of the live performance.
SWITCH SET TO STEREO
Mono Bridge Operation
The two internal power amplifiers(CHA and CHB) can be bridged together to form a single , higher-powered amp. This is especially useful when using the amplifier to power a subwoofer. In the mon o mode, the amplifier uses the channel 1 input jacks and sensitivity control(channel 2’s are disabled). When operating in this mode, each channel is independently protected. The signal smart switch must be set to the bridge position and the minimum speaker load impedance must be 8 ohms.
SWITCH SET TO STEREO
Documents / Resources
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SEIKAKU A150.2 Switching Power Professional
Amplifier
[pdf] User Manual
A150.2, A-300.2, A150.2 Switching Power Professional Amplifier, Switching
Power Professional Amplifier, Power Professional Amplifier, Professional
Amplifier, Amplifier
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