Crown Audio STUDIO AMPLIFIER owner manual Protection Systems, Indicator Status Amplifier Condition

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Studio Reference I & II Professional Studio Amplifiers

The green signal presence indicators flash synchro- nously with the amplifier’s output signal. The signal de- tector is connected to the signal path after the input gain stages and level controls, so a flashing indicator tells you that there is audio in and out of the amplifier. Note: The signal presence indicators may not report signal presence if the output signal level is too low.

The dynamic range /level meters are five-segment output meters that can be set to monitor either the dy- namic range or the level of the output signal. They are factory-set to show dynamic range. A switch located behind the front panel is used to select the meter dis- play mode (see Section 4.4 for complete instructions).

As dynamic range meters they show each channel’s ratio of peak-to-average power in dB. The dynamic range may be low for sources like AM/FM radio or low- quality recordings. Other sources like live music or high-quality recordings may be much higher. As out- put level meters they show how high the output levels are in dB relative to full power. At 0 dB, the unit is deliv- ering full standard 1 kHz power (see Section 6).

4.3 Protection Systems

Studio Reference amplifiers provide extensive protec- tion and diagnostics capabilities. Protection systems include ODEP, standby mode, an AC circuit breaker

 

 

 

 

 

Indicator Status

Amplifier Condition

 

 

 

 

 

 

ODEP

IOC

SIGNAL

There is no power to the amplifier.

Possible reasons: (1) The amplifier’s enable switch is off. (2) The

 

 

 

amplifier is not plugged into the power

receptacle. (3) The AC mains circuit breaker has been tripped.

 

 

 

(4) The amplifier’s circuit breaker has

been tripped.

OFF

OFF

OFF

 

 

 

 

 

 

 

ODEP

IOC

SIGNAL

Normal operation for a channel with

NO output. Possible reasons: (1) There is no input signal.

 

 

 

(2) The input signal level is very low.

(3) The channel’s level control is turned down.

ON

OFF

OFF

 

 

 

 

 

 

 

ODEP

IOC

SIGNAL

The amplifier is in standby mode.

Possible reasons: (1) The amplifier has just been turned on and

 

 

 

is still in the four second turn-on delay.

(2) A P.I.P. module such as an IQ-P.I.P. has turned off the

 

 

 

channel’s high-voltage supply. (3) The

DC/ low-frequency protection circuitry has been activated.

OFF

ON

OFF

(4) The fault protection circuitry has been activated. (5) The transformer thermal protection circuitry

 

 

 

has been activated. (6) The overvoltage protection circuitry has been activated.

 

 

 

 

ODEP

IOC

SIGNAL

ODEP limiting is about to begin or has just ended. Possible reasons: (1) The amplifier’s air filter is

 

 

 

blocked and needs to be cleaned. (2) There is insufficient cooling because of inadequate air flow or air

OFF

OFF

Active

that is too hot. (3) The load impedance for the channel is too low because the output is shorted or the

amplifier is driving too many loudspeakers for the selected stereo/mono mode. (4) The amplifier

 

 

 

channel is continuously being driven to very high output levels.

 

 

 

 

ODEP

IOC

SIGNAL

Channel 2 only: The amplifier is in Parallel-Mono mode with no output. The channel 2 IOC indi-

 

 

 

cator always turns on when the amplifier’s stereo/mono switch is moved to the Parallel-Mono position.

ON

ON

OFF

 

 

 

 

 

 

ODEP

IOC

SIGNAL

Normal operation for a channel with audio output. The ODEP indicator will remain at full intensity

 

 

 

to show that there is reserve thermal-dynamic energy and the signal presence indicator will flash to

 

 

 

show that there is audio output.

ON

OFF

Active

 

 

 

 

 

 

ODEP

IOC

SIGNAL

ODEP limiting has been activated. Possible reasons: (1) The amplifier’s air filter is blocked and needs

 

 

 

to be cleaned. (2) There is insufficient cooling because of inadequate air flow or air that is too hot.

 

 

 

(3) The load impedance for the channel is too low because the output is shorted or the amplifier is

OFF

ON

Active

driving too many loudspeakers for the selected stereo/mono mode. (4) The amplifier channel is

 

 

 

continuously being driven to very high output levels.

 

 

 

 

ODEP

IOC

SIGNAL

The channel’s output is exceeding 0.05% distortion. The input signal level is too high, and IOC is

 

 

 

reporting either an input overload or output clipping.

ON

ON

Active

 

OR

Channel 2 only: The amplifier is in Parallel-Mono mode and has output. The channel 2 IOC indi-

 

 

 

 

 

 

cator always turns on when the amplifier’s stereo/mono switch is moved to the Parallel-Mono position.

 

 

 

 

 

 

 

Fig. 4.2 Studio Reference Indicator States

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Contents Studio Reference Box 1000, Elkhart, Indiana TelephoneThree Year Full Warranty Crown Audio Division Technical Support Group Magnetic FieldContents Studio Reference II Minimum Power Matrix Studio Reference II Maximum Power MatrixStudio Reference I Power Draw, Current Draw Balanced and Unbalanced Phone PlugsUnpacking Instructions Studio Reference I AmplifierFeatures WelcomeFacilities Level ControlsReset Switch Do not use the channel 2 input in either mono modeCooling InstallationMounting Wiring Stereo ModeStereo Two-Channel Operation Bridge-Mono OperationMeters, switches, etc. to the Bridge-Mono output Mode until the wiring is removed especiallyBoth sides of the line must be isolated from Tortion and excessive heatingInput Connection CableShielded Twin-leadInput Wiring Tips Solving Input ProblemsUse Good Connectors Output ConnectionHigh frequency oscillations can cause your amplifier AC Mains Power Affect the output power available from the amplifierAvailable from most electrical supply stores Additional Load ProtectionOperation PrecautionsIndicators Indicator Status Amplifier Condition Protection SystemsStandby Mode OdepActivate its DC / low-frequency protection circuitry Amplifier’s transformer thermal protection cirControls Circuit BreakerFilter Cleaning Switch to the left to isolate or lift the groundsTechnical Information OverviewCircuit Theory Stereo OperationCircuit Block Diagram Bridge-Mono Operation Specifications PowerSignal-to-Noise A-weighted PerformanceOutput Signal Input/OutputProtection ConstructionCrown specifications are guaranteed for three years Minimum Guaranteed Power SpecificationsStudio Reference II Minimum Guaranteed Power Watts MainsMaximum Power Specifications Studio Reference I Maximum Power WattsStudio Reference II Maximum Power Watts 100Typical Frequency Response Typical Phase Response 10 Typical Crosstalk AC Power Draw and Thermal Dissipation Studio Reference50% 645 970 245 975 Here are some of the available P.I.P. modules AccessoriesP.I.P. Modules FXT Service Worldwide ServiceNorth American Service Crown Audio DivisionCrown Factory Service Information

STUDIO AMPLIFIER specifications

Crown Audio, a leader in professional audio solutions, has long been renowned for producing high-quality amplifiers, and their Studio Amplifier series exemplifies this reputation. The Crown Studio Amplifier is meticulously engineered for audiophiles and professionals seeking excellence in sound reproduction, characterized by its superior performance, reliability, and advanced features.

At the heart of the Crown Studio Amplifier lies its robust power output, designed to deliver pristine audio quality at high volumes without distortion. With various models available, users can choose from a range of power ratings, ensuring they have the right amount of amplification for their specific needs. This versatility makes the amplifier suitable for various applications, including recording studios, live sound environments, and high-fidelity home listening.

One of the standout features of the Crown Studio Amplifier is its advanced signal processing technology. The unit includes built-in DSP (Digital Signal Processing), which allows users to tailor the audio output with precision. This feature enables various EQ settings and dynamic range adjustments that enhance sound clarity and compensate for room acoustics, making it an essential tool for audio engineers and sound designers.

Further enhancing its capabilities, the Crown Studio Amplifier is designed with a sophisticated thermal management system that ensures optimal performance even during prolonged usage. Users can rely on its ability to maintain consistent output without overheating, which is crucial during demanding sessions, whether in the studio or at a live event.

Moreover, the Crown Studio Amplifier boasts a user-friendly interface, featuring intuitive controls that simplify operation. The LCD display provides vital information at a glance, allowing users to monitor levels, settings, and system status easily. This focus on usability enhances the overall experience, allowing professionals to concentrate on their craft rather than getting bogged down in technical complexities.

In addition to outstanding performance, the Crown Studio Amplifier is built for durability and longevity. The rugged chassis and high-quality components are designed to withstand the rigors of the road, making it a reliable choice for touring musicians and sound technicians alike.

With its impressive combination of power, advanced technology, and user-friendly features, the Crown Studio Amplifier continues to set a high standard in the audio industry, making it an ideal choice for anyone serious about sound quality. Whether for studio work, live performances, or home audio setups, the Crown Studio Amplifier delivers exceptional fidelity and reliability, upholding Crown's legacy of excellence in professional audio.
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