Crown Comprehensive Manual for Micro Tech Amplifiers: AC Power Draw and Thermal Dissipation
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Micro-Tech Series Power Amplifiers

9 AC Power Draw and

Thermal Dissipation

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

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

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

•Typical quiescent power draw for the Micro- Tech 600 is 65 watts; typical quiescent power draw for the Micro-Tech 1200 and 2400 is 80 watts.

•Quiescent thermal dissipation equals 222 btu/hr at 65 watts and 273 btu/hr at 80 watts.

•The estimated duty cycles take into account the typical crest factor for each 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 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 presented in Figures 9.1, 9.2 and 9.3:

 

 

Total output power with all

x

Duty

 

AC Mains Power

=

channels driven (watts)

 

Cycle

Quiescent Power

 

 

 

+

Draw (watts)

 

Amplifier Efficiency (.65)

 

 

Draw (watts)

The quiescent power draw figures provided in the opposite column are typical and include power drawn by the fan. 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 of 0.83 is needed to compen- sate for the difference in phase between the AC mains voltage and current. The following equa- tion is used to calculate thermal dissipation:

Thermal

 

Total output power with all x

Duty x .35

Quiescent Power

 

 

 

 

channels driven (watts)

Cycle

 

 

Dissipation =

(

 

 

 

 

 

 

+ Draw (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 dissipation in btu is divided by the

 

 

 

 

 

 

 

constant 3.968 to get kcal. If you plan to mea-

 

 

 

 

 

 

 

sure output power under real-world conditions,

 

 

 

 

 

 

 

the following equation may also be helpful:

 

 

 

Thermal

 

 

 

Total measured output power x .35

Quiescent Power

 

 

Dissipation =

 

 

from all channels (watts)

x

3.415

 

 

 

 

+

Draw (watts)

 

(btu/hr)

 

(

 

 

)

 

 

 

Amplifier Efficiency (.65)

 

 

 

Operation Manual

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Contents Micro-Tech 600, 1200 601, 1201 Some models may be exported under the name Amcron03/03 Output wiring Important Safety InstructionsWatch for These Symbols Magnetic FieldTable of Contents Features How to Use This ManualWelcome Unpacking Your AmplifierInstall Your Amplifier SetupYou may also stack amps without using a cabi- net Unpack Your AmplifierShows connector pin assignments for Choose Input Wire ConnectorsOutput Connections Choose Output Wire and Con- nectorsBridge-Mono Mode Wire Your System Stereo ModeInputs Connect input wiring to Channel 1 only Parallel-Mono ModeStartup Procedure Set Ground Lift SwitchSet Input Sensitivity Connect to AC MainsPrecautions OperationDo Not operate the amplifier with the Odep LEDs turning off Enable Indicator Odep Indicators Output Device Emulation ProtectionPower Switch Dust FilterStereo/Mono Modes Switch Rear Panel Facilities Power CordReset Switches Micro-Tech 2400 only Ground Lift SwitchAdvanced Features Options Accessories Cooling Fan Options Input Connectors OptionFilter Cleaning Principles of Operation OverviewCircuit Theory Only ONE Channel Shown Stereo OperationParallel-Mono Operation Bridge-Mono OperationHigh-voltage power supply fuse or breaker has blown TroubleshootingSpecifications 120 VAC, 60 Hz Units, Bridge mono mode120 VAC, 60 Hz Units, Parallel mono mode Dimensions Width, Height, Depth Power Draw at IdleWeight 120VAC, 60-Hz units Net Weight Shippping WeightAC Power Draw Thermal Dissipation AC Power Draw Thermal Dissipation Service Warranty Worldwide Except USA & Canada Items Excluded from this CROWN- WarrantyThis page intentionally left blank Crown Factory Service Information Nature of ProblemEnclose this Portion with the UNIT. do not Mail Separately

600, 2400, 1201, 1200, 2401 specifications

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