Crown Audio STUDIO AMPLIFIER owner manual Input/Output, Output Signal, Protection, Construction

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Studio Reference I & II Professional Studio Amplifiers

Sensitivity: A three-position switch inside the P.I.P. com- partment used to select the input sensitivity for both chan- nels: 0.775 or 1.4 volts for standard 1 kHz power, or a 26 dB voltage gain.

Meter On/Off: A two-position switch behind the front panel used to turn the front panel meters on or off.

Meter Display Mode: A two-position switch behind the front panel used to set the display mode for the front panel meters. Display modes include dynamic range of the output signal in dB or output levels in dB.

Ground Lift: A two-position back panel switch used to isolate the input phone jack and AC (chassis) grounds.

Reset: A two-position back panel switch used to reset the AC mains circuit breaker.

Indicators

Enable: This indicator shows the on/off status of the unit’s low-voltage power supply.

Signal: Each channel has a signal indicator that flashes to show audio output.

IOC: Each channel has an IOC indicator that flashes if the output waveform differs from the input waveform by 0.05% or more. The LEDs act as sensitive distortion indicators to provide proof of distortion-free performance. In Parallel- Mono mode the channel 2 IOC light stays on.

ODEP: Each channel has an ODEP indicator that shows the channel’s reserve energy status. Normally, the LEDs are brightly lit to show that reserve energy is available. In the rare event that a channel has no reserve, its indicator will dim in proportion to ODEP limiting. An ODEP indicator may also turn off under other more unusual circum- stances (see Section 4.3).

Dynamic Range/Level Meter: Each channel has a five- segment meter that displays either the dynamic range of the output signal in dB or the output level in dB. (From the factory, the amplifier is set to display dynamic range.) As dynamic range meters, they show the ratio of the peak to average power of each channel. As output level meters they show how high the output levels are relative to stan- dard 1 kHz power.

Input/Output

Input Connector: Two balanced phone jacks on the back panel and two balanced three-pin XLR connectors on the factory-installed P.I.P.-FX (see Section 8 for infor- mation on optional P.I.P. modules).

Input Impedance: Nominally 10 K ohms, balanced. Nominally 5 K ohms, unbalanced.

Input Sensitivity: Settings include 0.775 volts or 1.4 volts for standard 1 kHz power, or a 26 dB voltage gain (see Section 4.4 for more information).

Output Connectors: Two sets of color-coded 5-way binding posts for each channel (for connecting banana plugs, spade lugs or bare wire).

Output Impedance: Less than 10 milliohms in series with 2.5 microhenries.

DC Output Offset: (Shorted input) ±2 millivolts.

Output Signal

Stereo: Unbalanced, two-channel.

Bridge-Mono:Balanced, single-channel. Channel 1 con- trols are active; channel 2 should be turned down.

Parallel-Mono:Unbalanced, single-channel. Channel 1 controls are active; channel 2 is bypassed.

Protection

If unreasonable operating conditions occur, the protec- tion circuitry limits the drive level to protect the output stages especially in the case of elevated temperature. Transformer overheating will result in a temporary shut- down. Controlled slew-rate voltage amplifiers protect the unit against RF burnouts. Input overload protection is fur- nished at the amplifier input to limit current.

Turn On: The four second turn-on delay prevents dan- gerous turn-on transients. To change the turn-on delay time, contact Crown’s Technical Support Group.

Construction

Steel chassis with durable black finish, aluminum front panel with super-gloss Imron® finish, Lexan overlay, and a specially designed flow-through ventilation system from front to side panels.

Cooling: Convection cooling with assistance from the computerized, on-demand proportional cooling fan.

Dimensions: Standard 19 inch (48.3 cm) rack mount width (EIA RS-310-B), 7 inch (17.8 cm) height, 16 inch (40.6 cm) depth behind mounting surface and 2.75 inch (7 cm) protru- sion in front of mounting surface.

Approximate Weight: Center of gravity is about 6 inches (15.2 cm) behind the front mounting surface.

Studio Reference I : 60 pounds, 11 ounces (27.6 kg) net; 74 pounds, 3 ounces (33.7 kg) shipping weight. Studio Reference II : 56 pounds, 2 ounces (25.5 kg) net; 69 pounds, 10 ounces (31.6 kg) shipping weight.

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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 modeMounting InstallationCooling 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 ProtectionIndicators PrecautionsOperation 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 P.I.P. Modules AccessoriesHere are some of the available P.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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