Crown Audio M Series operation manual Neutrik Speakon connector. Both Channel

Page 17

M Series Power Amplifiers

5 Principles of Operation

The output transistors are protected by the Time Dependent Voltage & Current circuit. This cir- cuit protects the devices from extending beyond their safe area of operation, but allows the devices to provide high bursts of peak power with music, allowing your amplifier to deliver more punch. When all is said and done, this amplifier output topology offers a good combination of low quiescent amplifier heating, great distortion performance at high powers, and relative simplicity, with impressive reliabil- ity and value.

For extended flexibility, all of the amplifier’s output power is delivered through the Channel

1Neutrik® Speakon® connector. Both Channel

1and 2 output terminals are wired through the Channel 1 connector, allowing dual or bridge mono applications to be available with one

speaker cable. Refer to Figure 2.3 and Table 1 for Neutrik® Speakon® output pin assign- ments.

The output relay, in conjunction with input sig- nal mute circuit, assures the amplifier will be well-behaved during turn on and off. In the event of an amplifier output failure, a triac will activate to turn off the offending channel and protect your speakers.

The turn on delay circuit functions to keep the output relay open until all the voltages are up and stable, both in the amplifier, and in all the components in the system ahead of the ampli- fier.

Heatsink temperature is monitored by a thermal probe attached to the heatsink. As the tempera- ture rises, the probe sends a proportional cur- rent to the proportional speed fan circuit which starts the fan. Should the power transformer reach its maximum safe temperature, an inter- nal thermal switch opens and the fan circuit turns on full speed to quickly cool down the amplifier. It also disconnects the load via the output relay, removing any output current and further speeding a cool-down cycle. Extra care was taken during the design stage to set this point both to protect your investment and to guard against nuisance tripping.

Whenever the heatsinks or the transformer reach a maximum temperature, or during the normal turn on delay window, the front panel Fault LEDs will blink to get your attention.

A modular RJ-11 jack is mounted on the back panel (similar to the type used on telephones). Pins 2 and 5 are connected to an opto-isolator which is always in a low-resistance state when- ever the unit is on and happy. Should a fault be detected or should the amplifier lose AC power, the opto-isolator will change to a high resis- tance, allowing the user

to remotely detect the status of the amplifier. The Signal Presence Indicators tap the signal chain just before the level controls and prior to the power amplifier chain. They are not ampli- fier output indicators and should only be used to indicate the presence of signal to the ampli- fier front end.

The Clip light is driven from the output of the compressor circuitry and lights to indicate the onset of audible distortion. The Power LED is driven from the low-voltage supply.

A positive and negative regulator form the ±15- volt power supplies. Add to that the main trans- former, a full-wave bridge rectifier, and high energy electrolytics to form the main power supply. They are protected by the front-panel line circuit breaker and controlled by the front- panel power switch.

Operation Manual

page 17

Page 16 Page 18
Image 17
Page 16 Page 18
Contents Some models may be exported under the name Amcron M240Importantes Instructions de Sécurité Important Safety InstructionsDeclaration of Conformity Safety StandardCrown International, Inc European Representatives Name and AddressTable of Contents Welcome FeaturesHow to Use This Manual Install Your Amplifier SetupUnpack Your Amplifier Ensure Proper CoolingDistance Choose Input Wire and ConnectorsChoose Output Wire and Connectors How to Parallel the Inputs in Stereo Mode Wire Your System Stereo ModeTypical input and output wiring is shown Bridge-Mono ModeSet the Mode Switch to Bridge Inputs Use only the Channel-1 input connec- torConnect to AC Mains Startup ProcedureOperation PrecautionsCh-2 Level Control Ch-1 Level ControlReset Switch Front Panel Controls Indicators Power SwitchPower Indicator Signal, Clip and Fault IndicatorsCrown SST Modules Fault MonitoringTamper-Resistant Hole Plugs Optional 0.775-V Input Sensi- tivity SettingOptional Barrier Block Outputs Series Amplifier Principles of OperationNeutrik Speakon connector. Both Channel Condition Power indicator is off TroubleshootingKHz with 0.5% THD SpecificationsCommon Mode Rejection CMR20 Hz to 1 kHz Crosstalk below rated power, 20 Hz to 20 kHzVoltage Gain at maximum level setting Ventilation Cooling Dimensions Weight Net ShippingService 12/01 WarrantyWorldwide Except USA & Canada This page Intentionally Left Blank Crown Audio Factory Service Information Series Power Amplifiers Series Power Amplifiers

M Series specifications

Crown Audio's M Series amplifiers are a renowned collection in the realm of professional audio equipment, recognized for their reliability, performance, and innovation. Designed specifically for commercial installations, the M Series provides powerful amplification with exceptional audio quality, making it a prime choice for venues such as auditoriums, churches, and theaters.

One of the standout features of the M Series is its high-efficiency Class D topology. This design not only reduces power consumption but also minimizes heat generation, which is crucial for long-term reliability and performance in demanding environments. The amplifiers are capable of delivering high output power while maintaining low distortion, ensuring that the audio experience remains clear and robust, even at high volumes.

The M Series amplifiers are equipped with a range of power options, ensuring that users can find a model that suits their specific needs. The lineup typically includes models ranging from 2-channel to 4-channel configurations, with power ratings suitable for various applications. This versatility allows for flexible setups, whether powering large PA systems or smaller setups for more intimate settings.

Integration with control systems is effortless, thanks to the M Series’ comprehensive connectivity options. The amplifiers feature XLR and TRS inputs, allowing for seamless integration with a wide array of audio sources. Their ability to be controlled remotely allows for convenient adjustments during live events or installations, further enhancing their usability.

The built-in DSP (Digital Signal Processing) is another critical highlight of the M Series. This technology provides users with significant control over the audio signal, enabling adjustments such as equalization, limiting, and crossover settings to fine-tune the sound output to perfection. The advanced protection circuitry ensures that the amplifiers remain safe from overheating and signal overloads, thus extending their lifespan and reliability.

Robust construction is a signature characteristic of the M Series, designed to withstand the rigors of professional use. The amplifiers feature a rugged chassis that can endure the demands of touring or permanent installations. Additionally, the fan-cooled design aids in maintaining optimal operating temperatures, ensuring performance consistency even during extended periods of use.

In conclusion, Crown Audio's M Series amplifiers combine power, efficiency, and cutting-edge technology to create an exceptional solution for professional audio applications. Whether used in concert halls, clubs, or corporate environments, the M Series continues to set a high standard for reliability and performance in the world of audio amplification.
Top Page Image Contents