Crown Audio 280MA Input Volume Controls, Output Volume Controls, Output Signal Presence Indicator

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Commercial Audio Series Mixer-Amplifiers

1 Welcome

1.2 Front Panel Controls and Indicators

A. Input Signal Presence Indicator

Green LED, one for each input channel, illuminates when input signal exceeds –24 dBu (line) or –70 dBu (mic).

B. Input Volume Controls

Microphone/line, four in 180MA and 1160MA, eight in 280MA. Detented potentiometers with knobs.

C. Output Volume Controls

One per output channel. Detented potentiometer with knob.

D. Output Signal Presence Indicator

Green LED, one for each output channel, illuminates when output signal level exceeds 100 mV (45 dB below full power) from the 4-ohm tap. Does not respond to sig- nals from the AMP INPUT connector.

E. Clip Indicator

Red LED, one per output channel, illuminates at thresh- old of audible distortion. Does not respond to signals from the AMP INPUT connector.

F. Power Indicator

Blue LED indicates power on.

G, H. Tone Controls

Bass and Treble non-detented potentiometers on each input channel. Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.

I. Power Switch

Pushbutton on-off switch. The power switch does not affect the 24V DC auxiliary power input (letter “K” on next page).

Figure 1.1 Front Panel Controls and Indicators

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Operation Manual

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Contents 180MA 280MASome models may be exported under the name Amcron Important Safety Instructions Use only with a cart, stand, tripod, bracket, orCrown International, Inc Safety StandardDeclaration of Conformity European Representative’s Name and AddressTable of Contents Features WelcomeOutput Signal Presence Indicator Input Volume ControlsOutput Volume Controls Clip IndicatorAmplifier Outputs Connectors Back Panel Controls and Connectors Reset SwitchAuxiliary Power Input Amp Config SwitchSetup InstallationHow to Attach Rack Ears Choose Input Wire and Connectors Choose Output Wire and ConnectorsWire Your System Typical input and output wiring is shown in FigureOutputs Maintain proper polarity +/- on output con- nectors How to link another mixer to your mixer-amplifier Phantom PowerLink In/Out Switches How to set up Music-On-Hold outputIncluded Accessories Remote Volume ControlPowering Up Optional AccessoriesBlock Diagram 280MA Block DiagramTroubleshooting No input signal Input signal level is very lowSpecifications Service Warranty 12/01Worldwide Except USA & Canada Type of credit card City State/Prov Postal Code CountryCredit card information MasterCard Personal/Consumer Visa

180MA, 280MA specifications

Crown Audio has established itself as a leader in the professional audio industry, and its 280MA and 180MA models epitomize its commitment to high-quality sound reinforcement. These amplifiers are designed for a range of applications, including commercial audio, live sound, and installation, providing unmatched performance and reliability.

The Crown 280MA is a robust two-channel amplifier that delivers an impressive power output of 280 watts per channel at 4 ohms. Its engineering focuses on efficiency and clarity, making it an excellent choice for any scenario where quality audio is essential. One of its standout features is the built-in mixer, which allows users to connect multiple audio sources seamlessly. This mixing capability is especially beneficial in environments such as restaurants, schools, and places of worship, where different audio sources may need to be balanced and controlled easily.

On the other hand, the Crown 180MA offers a more compact design but does not compromise on performance. With a power output of 180 watts per channel at 4 ohms, this model is perfect for smaller venues or setups. Like the 280MA, the 180MA also includes a built-in mixer, ensuring versatile audio management. Both models feature a streamlined user interface, enabling intuitive operation and quick adjustments.

Both amplifiers incorporate advanced technology such as Crown's proprietary DriveCore technology, which enhances power efficiency while reducing distortion. This technology allows the amplifiers to deliver clean, transparent power without the weight typically associated with traditional designs. The lightweight nature of both models makes installation and transport straightforward, adding to their practicality for sound engineers and event organizers.

The overall construction of the 280MA and 180MA is rugged, built to withstand the rigors of professional use. Features such as short-circuit protection, thermal protection, and overload protection ensure long-term reliability, even in demanding environments. Furthermore, the amplifiers offer flexible input options, including line-level and microphone inputs, allowing users to connect various audio sources without hassle.

In conclusion, the Crown 280MA and 180MA amplifiers represent a perfect blend of power, efficiency, and advanced technology. Their built-in mixers, robust protection features, and lightweight designs make them highly versatile for a wide array of applications. Whether used in commercial settings or live sound environments, these amplifiers ensure that the audio experience remains top-notch, reinforcing Crown Audio's reputation as an industry leader.