Crown Audio STUDIO AMPLIFIER owner manual AC Power Draw and Thermal Dissipation, Studio Reference

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Studio Reference I & II Professional Studio Amplifiers

7 AC Power Draw and Thermal Dissipation

This section provides detailed information about the amount of power and current drawn from the AC mains by Studio Reference amplifiers and the amount of heat produced under various conditions. The calculations presented here are intended to provide a very realistic and reliable depiction of the amplifiers. The following assumptions were made:

The amplifier’s available channels are loaded, and full, standard 1 kHz power is being delivered.

Amplifier efficiency at standard 1 kHz power is estimated to be 65%.

Quiescent power draw is 90 watts (an almost negligible amount for full-power calculations).

Quiescent thermal dissipation equals 307 btu/hr at 90 watts.

Duty cycle takes into account the typical crest factor for a particular type of source material.

Duty cycle of pink noise is 50%.

Duty cycle of highly compressed rock ‘n’ roll midrange is 40%.

Duty cycle of uncompressed rock ‘n’ roll is 30%.

Duty cycle of background music is 20%.

Duty cycle of continuous speech is 10%.

Duty cycle of infrequent paging is 1%.

Here are the equations used to calculate the data pre- sented in Figures 7.1 and 7.2:

The estimated quiescent power draw of 90 watts is a maximum figure, and assumes the fan is running at high speed. The following equation converts power draw in watts to current draw in amperes:

 

 

 

AC Mains Power

Current Draw

=

 

Draw (watts)

(amperes)

 

AC Mains x

Power

 

 

 

Voltage

Factor (.83)

The power factor constant of 0.83 is needed to compensate for the difference in phase between in the AC mains voltage and current. The following equation was used to calculate thermal dissipation:

Thermal

 

Total output power with all

x

Duty

x .35

Quiescent Power

 

 

 

channels driven (watts)

 

Cycle

 

 

 

Dissipation =

(

 

 

 

 

+

Draw (90 watts)

)

x 3.415

(btu/hr)

Amplifier Efficiency (.65)

 

 

 

 

 

 

The constant 0.35 is inefficiency (1.00 – 0.65) and the factor 3.415 converts watts to btu/hr. Thermal dissipa- tion in btu is divided by the constant 3.968 to get kcal. If you plan to measure output power under real-world conditions, the following equation may be helpful:

Thermal

 

Total output power with all

x

Duty

Quiescent Power

 

 

 

channels driven (watts)

Cycle x .35

 

Dissipation =

(

 

 

 

+

Draw (90 watts)

)

x 3.415

(btu/hr)

 

 

 

 

Amplifier Efficiency (.65)

 

 

Studio Reference I

L O A D

 

8 Ohm Stereo / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono

4 Ohm Stereo / 8 Ohm Bridge-Mono / 2 Ohm Parallel-Mono

 

 

 

 

 

 

 

 

 

 

 

 

AC Mains

Current Draw (Amps)

Thermal Dissipation

AC Mains

Current Draw (Amps)

Thermal Dissipation

Duty

Power

 

 

 

 

Power

 

 

 

 

Cycle

Draw

100-120 V

220-240 V

btu/hr

kcal/hr

Draw

100-120 V

220-240 V

btu/hr

kcal/hr

 

(Watts)

(Watts)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50%

1325

15.9

7.2

1,780

450

1,925

23.1

10.5

2,500

630

40%

1075

12.9

5.9

1,485

375

1,555

18.7

8.5

2,060

520

30%

830

10.0

4.5

1,190

300

1,190

14.3

6.5

1,620

410

 

 

 

 

 

 

 

 

 

 

 

20%

585

7.0

3.2

900

230

825

9.9

4.5

1,185

300

10%

340

4.1

1.8

605

155

460

5.5

2.5

745

190

 

 

 

 

 

 

 

 

 

 

 

Fig. 7.1 Studio Reference I Power Draw, Current Draw and

Thermal Dissipation at Various Duty Cycles

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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 modeInstallation MountingCooling 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 ProtectionPrecautions IndicatorsOperation 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 Accessories P.I.P. ModulesHere 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.