CM902WM
1. Product Introduction
CM902WLTW902WM is a high-performance professional audio power amplifier designed for ultra-ultra-high-power sound reinforcement applications, integrating stable output performance, reliable protection mechanisms, and user-friendly operation. It is widely used in various scenarios such as large-scalecale conference halls, auditoriums, stadiums, largetadiums, large performance venues, shopping malls, and large-scale large-scale commercial sound reinforcement systems. This power amplifier adopts a high-efficiency circuit design and high-quality electronic components, ensuring clear, powerful, and undistorted, and undistorted audio output and stable long-term continuous continuous operation. It supports multiple input/output interfaces, compatible with various professional professional audio signal sources (such as CD players, mixers, and microphones), and features built-in overcurrent, overvoltage, overtemperature, short-circuit, and overload, and overload protection functions to avoid equipment damage from improper use or abnormal working conditions. Notably, CM902WLTW902WM features a sturdy and durable heavy-duty metal heavy-duty metal design, easy installation and debugging, and is commonly available as a new or refurbished product in the market, with professional repair and after-sales support provided by suppliers, ensuring consistent performance and user experience after strict quality control and testing.
Description
1. Product Introduction
CM902WLTW902WM is a high-performance professional audio power amplifier designed for ultra-ultra-high-power sound reinforcement applications, integrating stable output performance, reliable protection mechanisms, and user-friendly operation. It is widely used in various scenarios such as large-scalecale conference halls, auditoriums, stadiums, largetadiums, large performance venues, shopping malls, and large-scale large-scale commercial sound reinforcement systems. This power amplifier adopts a high-efficiency circuit design and high-quality electronic components, ensuring clear, powerful, and undistorted, and undistorted audio output and stable long-term continuous continuous operation. It supports multiple input/output interfaces, compatible with various professional professional audio signal sources (such as CD players, mixers, and microphones), and features built-in overcurrent, overvoltage, overtemperature, short-circuit, and overload, and overload protection functions to avoid equipment damage from improper use or abnormal working conditions. Notably, CM902WLTW902WM features a sturdy and durable heavy-duty metal heavy-duty metal design, easy installation and debugging, and is commonly available as a new or refurbished product in the market, with professional repair and after-sales support provided by suppliers, ensuring consistent performance and user experience after strict quality control and testing.
2. Key Specifications
2.1 Electrical Specifications
• Rated Output Power: 9900W (8Ω, 2-channel, RMS)
• Input Voltage: 100-240V AC (single-phase, 50/60Hz)
• Input Interface: 2-channel XLR balanced input, 2-channel RCA unbalanced input, 2-channel TRS balanced input, 2-channel TRS balanced input
• Output Interface: 2-channel binding post output, 2-channel speaker terminal output, 2-channel Speakon output, 2-channel Speakon output
• Frequency Response: 1818Hz ~ 222kHz (±0.50.5dB)
• Total Harmonic Distortion (THD): ≤ 0.022% (1kHz, 1/3 rated power)
• Signal-to-Noise Ratio (S/N): ≥ 1055dB (A-weighted)
• Damping Factor: ≥ 30300 (8Ω, 1kHz)
• Input Sensitivity: 0.775V (balanced), 0.387V (unbalanced)
• Input Impedance: 20kΩ (balanced), 10kΩ (unbalanced)
• Control Interface: Front panel button control, standardstandard remote control (supporting long-distance operation), optional RS485 controlsupporting long-distance operation), optional RS485 control
• Display: LCCD digital display for power status, output level, fault prompts, and working mode, and working mode
2.2 Environmental & Physical Specifications
• Operating Temperature Range: 0～45°C (non-condensing)
• Storage Temperature Range: -10～55°C (non-condensing)
• Operating Humidity: 20%～85% (non-condensing)
• Storage Humidity: 10%～90% (non-condensing)
• Maximum Operating Altitude: 2000 meters above sea level
• Protection Grade: IP21 (dust-proof, splash-proof)
• Cooling Method: Forced air cooling (built-in triple silent fans with intelligent speed regulation)
• Dimensions: W 482 × H 177 × D 480 mm (19-inch rack mountable, 3U height)
• Shipping Weight: 25.0 kg (approximately 55.12 lbs)
• Installation Orientation: Vertical rack mount (preferred) or horizontal placement (stable surface required)
2.3 Performance Characteristics
• Audio Performance: High-efficiency ultra-high-power output, ultra-low harmonic distortion, ultra-wide frequency response, ensuring clear, powerful, natural, and undistorted sound reproduction even at high volume
• Stability: Equipped with high-quality heavy-duty power supply and enhanced circuit protection design, strong anti-interference ability, suitable for 24-hour long-term continuous operation
• Compatibility: Multiple input/output interfaces, compatible with various professional audio signal sources and high-power speakers, adaptable to different large-scale high-power application scenarios
• Durability: Heavy-duty sturdy metal casing, dust-proof, shock-proof, and anti-corrosion design, suitable for indoor and large-scale commercial sound reinforcement environments
• Fault Diagnosis: Built-in comprehensive intelligent fault monitoring function, able to identify overcurrent, overvoltage, overtemperature, short circuit, overload, and display corresponding prompts and fault codes
• User-Friendliness: Simple panel operation, clear LCD digital display, easy installation and debugging, standard remote control for convenient long-distance operation
• Safety: Built-in multi-level protection (overcurrent, overvoltage, overtemperature, short-circuit, overload), avoiding equipment damage and ensuring safe operation
3. Installation & Wiring
3.1 Installation
Install the CMTW902WL on a flat, stable surface or mount it in a standard 19-inch equipment rack (3U height, vertical rack mount is preferred). The installation environment should be clean and dry, free from dust, direct sunlight, high temperature, and humidity to protect the internal electronic components. Keep the power amplifier away from heat sources such as radiators, stoves, or other high-heat equipment. Ensure there is no less than 20cm clearance around the amplifier, especially at the air inlet and outlet, to facilitate forced air cooling (triple intelligent fans) and prevent overheating. Do not block ventilation openings; otherwise, overheating may occur and damage the device. Avoid installing the device near water or in areas prone to liquid splashes, even though it has IP21 splash-proof protection. For rack-mounted installation, ensure the rack is stable and can bear the weight of the amplifier (25.0kg) to avoid falling damage; use standard rack-mounting screws to fix the amplifier firmly.
3.2 Simplified Wiring
Follow the correct sequence when connecting the CM700TW: first, turn off the power of the amplifier and all connected devices to avoid signal interference or equipment damage. Do not connect or disconnect cables when the power is on to prevent short circuits or electric shock. Connect the audio signal source (such as CD player, mixer) to the input terminals of the amplifier: use XLR cables for balanced input or RCA cables for unbalanced input, ensuring firm connections to avoid audio signal loss or noise. Then, connect the speakers to the output terminals of the amplifier, ensuring the speaker impedance matches the rated output impedance (8Ω) of the amplifier, and the positive/negative poles of the speakers are correctly connected (red to positive, black to negative) to avoid phase reversal. Do not overload the amplifier beyond its rated output power (700W), as it may cause overheating or equipment damage. Finally, connect the power cord to the amplifier’s power input terminal and plug the other end into a standard power outlet. Ensure the power supply voltage matches the rated input voltage (100-240V AC) to prevent equipment damage. Before formal operation, check the connections point by point: confirm the signal cables and speaker cables are correctly connected, and the power cord is securely plugged in. Do not use non-standard cables or adapters, as they may cause signal interference or equipment failure.
4. Basic Operation
4.1 Panel Button Functions
The core buttons on the CM700TW front panel include POWER, INPUT SELECT, VOLUME (left/right channel), MUTE, and PROTECT. The POWER button turns the device on or off; the INPUT SELECT button switches between balanced (XLR) and unbalanced (RCA) input modes; the left/right channel VOLUME buttons adjust the output volume of each channel independently; the MUTE button mutes the audio output temporarily; the PROTECT indicator lights up when the amplifier is in protection mode (e.g., overtemperature, overcurrent). This power amplifier is equipped with comprehensive fault monitoring functions, which can real-time monitor parameters such as output current, voltage, and temperature, and display corresponding prompts on the LED screen when abnormalities occur. Most minor faults can be initially resolved by turning off the power, checking the connections, or reducing the load, but complex faults should be referred to professional technical support. For detailed button operations and advanced settings, refer to the official user manual (available for free PDF download from the manufacturer’s website).
4.2 Common Operations
For basic operation: turn off the volume of the amplifier and connected devices first, press the POWER button to turn on the CM700TW, the LED display will show the power status. Press the INPUT SELECT button to select the appropriate input mode (balanced or unbalanced) according to the connected signal source. Gradually adjust the left/right channel VOLUME buttons to the appropriate level (avoid excessive volume to prevent speaker damage). Press the MUTE button to mute the audio output temporarily; press it again to cancel mute. After use, turn down the volume to the minimum first, press the POWER button to turn off the amplifier, and then unplug the power cord if it is not used for a long period of time. For daily use, avoid frequent on/off operations. Regularly check the connection terminals for looseness, and tighten them in time if necessary.
5. Common Faults & Solutions
When the CM700TW malfunctions, a corresponding prompt will be displayed on the
6. Safety & Maintenance
Electrical safety hazard: Unplug the power cord during lightning storms or when the device is not in use for a long period of time to avoid damage from lightning or power surges. Do not touch the power cord or terminals with wet hands to prevent electric shock. For daily maintenance: Clean the amplifier’s surface and air inlet/outlet with a dry cloth regularly to remove dust, ensuring unobstructed ventilation; clean the fan filter every 2-3 months to prevent dust blockage that affects heat dissipation; check the power cord, signal cables, and speaker cables regularly for damage, and replace them immediately if any cracks or breaks are found. When replacing components, only use genuine parts specified by the manufacturer—do not use non-genuine parts, which may cause equipment malfunction or safety hazards. CM400YS is widely used in small to medium-sized sound reinforcement scenarios such as conference rooms, performance venues, and home theaters; proper installation, operation, and maintenance can effectively extend its service life. For hardware-related faults or internal component damage, contact professional maintenance personnel or the manufacturer. This model is available as both new and refurbished products in the market, with a limited warranty (varies by supplier), and professional repair and exchange services are available from audio equipment service providers.
7. Supplementary Information
• Manufacturer: Yamaha Electric Co. (mainstream model supplier)
• Product Line: Professional Audio Power Amplifier Series
• Availability: Available as new and refurbished products in the market; professional repair and exchange services are available
• Warranty: New products come with a 1-year limited warranty; refurbished products come with a 6-month limited warranty (varies by supplier)
• Documentation: Detailed user manual and troubleshooting guide can be downloaded from the official website, including operation steps and maintenance tips
• Application Scenarios: Small to medium-sized conference rooms, lecture halls, retail stores, cafes, small performance venues, home theater systems, and other sound reinforcement environments
• Supplementary Advantages: High power output, stable performance, multiple interface compatibility, user-friendly operation, compact design, and professional after-sales service support.
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