Crown Audio MA-36X12 Troubleshooting, Front panel has several helpful indicator LEDs Figure

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Macro-Tech MA-24X6 & 36X12 Power Amplifiers

5 Troubleshooting

5.1 Indicators

The front panel has several helpful indicator

LEDs (Figure 5.1).

The amber Enable indicator is provided to show the amplifier has been turned on (or enabled) and that its low voltage power supply and forced-air cooling system are working. It does not indicate the status of the high voltage supplies. For example, the Enable indicator will remain lit during unusual conditions that would cause the amplifier’s protection systems to put a high-voltage supply in “standby” mode (see Section 4.1.3).

The amber ODEP indicators confirm the nor- mal operation of Crown’s patented Output Device Emulation Protection circuitry. During normal operation, they glow brightly to show the presence of reserve thermal-dynamic energy. They dim proportionally as the energy reserve decreases. In the rare event that there is no reserve, the indicators turn off and ODEP proportionally limits the drive level of the out- put stages so the amplifier can continue safe

operation even when conditions are severe. (For a more detailed description of ODEP, see Section 4.1.1).

The ODEP indicator for the affected channel will turn off if a high-voltage power supply is put in “standby” mode, a high-voltage power supply fuse (or breaker) blows, or a transformer acti- vates its thermal protection circuitry (see Sec- tion 4.1.4). Both ODEP indicators turn off if the amplifier loses AC power, the power switch is turned off or the low-voltage power supply fuse blows.

The green Signal/IOC indicators show sig- nal presence, distortion and input overload. As signal presence indicators, they flash with nor- mal intensity in sync with the output audio sig- nals. As IOC (Input/Output Comparator) indicators, they flash brightly if there is any dif- ference between the input and output signal waveforms greater than 0.05%. Because tran- sient distortion happens quickly, a 0.1 second “hold delay” keeps the indicators on long enough to be easily noticed. The IOC function provides proof of distortion-free performance.

As input overload indicators, they flash brightly with a 0.5 second hold delay to show that an input signal is too large and must be clipped at the input.

Under conditions where one of the amplifier’s high-voltage power supplies is temporarily put in standby mode, the Signal/IOC indicators will stay on with full brightness. They will resume normal operation when the amplifier is no longer in standby mode.

The table in Figure 5.2 shows the possible states for the ODEP and Signal/IOC indicators. It also describes the conditions that may be associated with the different indicator states. The Enable indicator will be off with the first indicator state, “There is no power to the ampli- fier.” All other conditions in the table will occur with the Enable indicator turned on. It is impor- tant to note the possible states of the indicators in the rare event that you experience a problem. This can greatly aid in determining the source of problems. Please contact your local Crown representative or our Technical Support Group for further assistance.

Figure 5.1Indicators

Operation Manual

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Contents Some models may be exported under the name Amcron MA-24X6Use only with a cart, stand, bracket, or table Important Safety InstructionsMA Series amplifiers require Class 2 output wiring Crown International, Inc Safety StandardTCF Technical Certificate No P4300CRI1.IWS Competent Body’s Name and AddressTable of Contents Welcome FeaturesHow to Use This Manual You may also stack amps without using a cabi- net SetupUnpack Your Amplifier Install Your Amplifier Connectors Choose Input Wire Balanced LineDistance Wire Size Choose Output Wire and Con- nectorsSystem Wiring a Macro-Tech 36x12 is shown Wire Your SystemTurn up the level of your audio source to an optimum level Startup ProcedureConnect to AC Mains Operation PrecautionsSignal/IOC Indicator Front Panel Controls Indicators Dust FilterOdep Indicator Enable IndicatorReset Switches Power CordInput Sensitivity Switch Ground Lift SwitchStandby Mode Advanced Features OptionsProtection Systems Output Device Emulation Protection OdepCircuit Designs Grounded Bridge Transformer Thermal ProtectionCircuit Breakers Input Ground Lift Switch Replace the PIP module and restore the powerOptions PIP Modules IQ-PIP-USP2 AdapterFront panel has several helpful indicator LEDs Figure TroubleshootingOdep and Signal/IOC Indicator States Theory of Operation Only ONE Channel Shown Specifications Dimensions Power Draw at IdleWeight Output ImpedanceTypical Phase Response Following equation is used to calculate thermal dissipation AC Power Draw Thermal DissipationAC Power Draw Thermal Dissipation Service 12/01 WarrantyWorldwide Except USA & Canada Nature of Problem Crown Factory Service InformationThis page intentionally left blank This page intentionally left blank Macro-Tech MA-24X6 & 36X12 Power Amplifiers

MA-36X12, MA-24X6 specifications

Crown Audio is a renowned name in the professional audio industry, celebrated for its commitment to innovation and reliability. Two prominent offerings that stand out in their lineup are the MA-36X12 and MA-24X6 power amplifiers. Designed for versatility and performance, both models cater to a variety of applications, ranging from commercial installations to live sound environments.

The Crown MA-36X12 amplifier delivers 36 channels of robust power, making it an ideal choice for larger systems requiring multiple zones of audio distribution. Its ability to provide a solid output ensures that every speaker in a setup receives the necessary power, maintaining audio clarity and preventing distortion. The MA-36X12 is engineered with a focus on thermal efficiency, utilizing advanced cooling systems to minimize overheating during extended use. Additionally, its compact design allows for easy integration into various environments, whether it be schools, conference centers, or places of worship.

On the other hand, the Crown MA-24X6 amplifier offers 24 channels of audio powerhouse capability. With slightly less power than the MA-36X12, the MA-24X6 is still no slouch; it provides exceptional sound quality, making it suitable for smaller installations or setups requiring fewer channels but high-quality delivery. The MA-24X6 features an intuitive user interface, allowing for seamless adjustments and monitoring of each channel's performance. This amplifier also comes equipped with integrated signal processing capabilities that enable users to fine-tune audio output according to specific acoustics and requirements.

Both models incorporate Crown’s proprietary DriveCore technology, which combines superior sound quality with greater efficiency in amplifying audio signals. This technology minimizes power consumption while maximizing output, ensuring that audio reproduction is both dynamic and clear. Furthermore, Crown’s Smart Amp technology enhances reliability by incorporating self-monitoring functions that provide real-time feedback on performance and status.

In terms of connectivity, the MA-36X12 and MA-24X6 amplifiers come with a variety of inputs and outputs to accommodate diverse audio sources and speaker configurations. Their rugged construction makes them well-suited to endure the rigors of live events and installations, ensuring they deliver consistent performance over time.

In summary, the Crown Audio MA-36X12 and MA-24X6 amplifiers exemplify the brand's dedication to quality and innovation in professional audio solutions. With advanced technologies and versatile features, they respectively cater to both large and small installation needs, making them reliable choices for audio professionals around the globe.
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