Crown Audio Comprehensive Guide to Mixer-Amplifiers: 180MA and 280MA
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Commercial Audio Series Mixer-Amplifiers

2.6 Input Routing

In the 280MA, any input can be assigned to Amp 1, Amp 2 or both. The two DIP switches labeled INPUT ROUTING are used (Figure 2.8). Follow the settings printed on the back panel next to the INPUT ROUTING switch. For example, to send input Channel 3 to Amp 1 and Amp 2, turn on DIP switches 13 and 14.

Figure 2.8 Input Routing DIP Switches

2.7 Phantom Power

To turn on phantom power on all mic inputs, turn on the switch number 7 in the AMP CONFIG DIP switch.

2.8 Priority Muting

A back-panel AMP CONFIG DIP switch (Figure 2.9) can assign Input Ch. 1 or Input Ch. 5 as the priority input for each amplifier output, which tem- porarily mutes the remaining inputs. Muting is activated by contact clo- sures.

For example, suppose you configured Channel 1 as the priority input. Mic 1 is plugged into Channel 1. A press-to-talk switch in Mic 1 is wired to the Priority connector in the mixer-amplifier. When you press the mic switch, all other signals are muted so you can make an announcement on Mic 1.

Figure 2.9 AMP CONFIG DIP Switch

One DIP-switch selection enables Channel 1 as the priority input, which mutes all other inputs to Amp 1. In the 280MA only, another DIP switch selection enables Channel 5 as the priority input, which mutes all other inputs to Amp 2. In the 280MA only, another set of DIP switches enable Channel 1 as the priority input into both Amp 1 and Amp 2, effectively muting any input.

To set the mixer-amplifier for normal mode with no priority:

Set the AMP CONFIG DIP switch as follows:

1ON

2 OFF

3 OFF

4 OFF

5 ON

6 OFF

To give priority to the Channel-1 input in Amp 1 only: Set the AMP CONFIG DIP switch as follows:

1OFF

2 ON

3 OFF

4 OFF

Also, wire a SPST switch to the PRIORITY connector between COM and CH 1 AMP 1. Close the switch when you want the Channel-1 input to mute all other inputs feeding Amp 1.

To give priority to the Channel-5 input in Amp 2 only:

Set the AMP CONFIG DIP switch as follows:

5OFF

6 ON

Also, wire a SPST switch to the PRIORITY connector between COM and CH 5 AMP 2. Close the switch when you want the Channel-5 input to mute all other inputs feeding Amp 2.

To give priority to the Channel-1 input in Amp 1 and Amp 2:

Set the AMP CONFIG DIP switch as follows:

1OFF

2 ON

3 ON

4 ON

Also, wire a SPST switch to the PRIORITY connector between COM and CH1 AMP 1. Close the switch when you want the Channel-1 input to mute all other inputs feeding Amp 1 and Amp 2.

Note: The routing configuration is extremely versatile. Many configura- tions for additional applications not highlighted in this document can be created by examining the signal flow in the block diagram on page 13.

2.9 Link In/Out Switches

These switches (Figure 2.10) affect which signals are heard when another mixer is wired to the mixer-amplifier. One switch is included per amplifier channel.

IN: Any signal applied to the AMP INPUT connector will be mixed with the input signal(s).

OUT: Only the signal from the AMP INPUT connector will appear at the amplifier output.

How to link another mixer to your mixer-amplifier:

Connect the extra mixer’s LINE OUT connector to the mixer-amplifier’s AMP INPUT connector. Set the Link switch to IN.

How to set up Music-On-Hold output:

Connect mixer-amp LINE OUT to Music-On-Hold input on telephone system interface/PBX. Set the LINK SWITCH to IN.

How to set up a processing loop:

Connect mixer-amp LINE OUT to processor input. Connect processor output to mixer-amp AMP INPUT connector. Set the Link switch to OUT.

Figure 2.10

Link In/Out Switches

Operation Manual

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Contents Some models may be exported under the name Amcron 180MA280MA Use only with a cart, stand, tripod, bracket, or Important Safety InstructionsEuropean Representative’s Name and Address Safety StandardDeclaration of Conformity Crown International, IncTable of Contents Welcome FeaturesClip Indicator Input Volume ControlsOutput Volume Controls Output Signal Presence IndicatorAmp Config Switch Back Panel Controls and Connectors Reset SwitchAuxiliary Power Input Amplifier Outputs ConnectorsHow to Attach Rack Ears SetupInstallation Choose Output Wire and Connectors Choose Input Wire and ConnectorsOutputs Maintain proper polarity +/- on output con- nectors Wire Your SystemTypical input and output wiring is shown in Figure How to set up Music-On-Hold output Phantom PowerLink In/Out Switches How to link another mixer to your mixer-amplifierOptional Accessories Remote Volume ControlPowering Up Included Accessories280MA Block Diagram Block DiagramNo input signal Input signal level is very low TroubleshootingSpecifications Service 12/01 WarrantyWorldwide Except USA & Canada MasterCard Personal/Consumer Visa City State/Prov Postal Code CountryCredit card information Type of credit card

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.
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