Crown Audio 1200 service manual Specifications, POWER Power, Performance, Mechanical

Micro-Tech 1200 Amplifier Service Manual

Specifications

Unless noted otherwise, all specifications are based on driving an 8 ohm load per channel, both channels driven, the sensitivity switch in the 26dB position, the AC supply is 120VAC at 60Hz. Crown specifications are guaranteed through the warranty period (normally 3 years). Because our testing methods are more strin- gent than our published specifications, every Crown amplifier will exceed its published specifications.

POWER

Power

8 Ohm Stereo—310W/Ch

4 Ohm Stereo—480W/Ch

2 Ohm Stereo—675W/Ch

8 Ohm Bridge Mono—970W

4 Ohm Bridge Mono—1300W

2 Ohm Parallel Mono—965W

1 Ohm Parallel Mono—1300W

Load Impedances: Rated for 16, 8, 4, 2, and 1 (parallel mono only) Ohm operation; safe with all types of loads, even totally reactive loads.

AC Mains: 120VAC at 60 Hz with standard three-wire grounded connector for North American units; 100VAC, 120VAC, 220VAC, and 240VAC at 50 or 60 Hz when equipped with universal transformers, applicable fan assembly, and other applicable hardware with coun- try specific power cord.

PERFORMANCE

Frequency Response: ±0.1dB from 20 Hz to 20 kHz at 1 Watt.

Phase Response: ±10° from 10 Hz to 20 kHz at 1 Watt.

Signal to Noise Ratio: A-weighted, better than 105 dB below full rated output. Better than 100 dB below full rated output from 20 Hz to 20 kHz.

Total Harmonic Distortion (THD): <0.05% from 20 Hz to 1 kHz, increasing linearly to 0.1% at 20 kHz at 500W.

I.M. Distortion: <0.05% from less than 164 milliwatts to 520 W at 26 dB gain.

Slew Rate: >13V per microsecond. (Slew rates are limited to useful levels for ultrasonic/RF protection.)

Damping Factor: >1000 from 10 Hz to 400 Hz.

DC Offset: <10 millivolts.

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Input Impedance: Nominally 20K ohms balanced; 10K ohms unbalanced.

Output Impedance: <10 milliohms in series with <2 microhenries.

Protection Systems: Output Device Emulation Protec- tion (ODEP) limits drive in the event of dangerous dynamic thermal conditions without interrupting power. Current limiting for shorted load protection. DC/LF and common mode output current Fault circuitry to mute audio. Delay of 4 seconds from turn on mutes amplifier to prevent dangerous turn-on transients. A high volt- age circuit breaker in each main transformer primary and a low voltage power supply fuse in fan primary. Slew rate limiting to prevent RF burn out.

MECHANICAL

Input Connectors: Balanced 1/4 inch phone jacks. Op- tional XLR inputs with MT-XLR accessory.

Output Connectors: Color-coded 5-way binding posts on 3/4 inch centers; spaced 3/4 inch apart.

Front Panel Controls: A front panel rocker switch used to power the amplifier on and off.

Back Panel Controls: A three-position switch which selects Stereo, Bridge-Mono, or Parallel-Mono mode. A rotary potentiometer for each channel used to control output level. A ground lift switch used to isolate the phone jack input grounds from the chassis (AC) ground. And a push button circuit breaker for each channel used to protect the power supplies.

Internal Controls: A three-position switch selects 0.775V, 1.4V, or 26 dB voltage gain input sensitivity.

Indicators: Amber Enable indicator shows on/off status of low-voltage power supply. An Amber ODEP indica- tor for each channel shows the reserve energy status. If no reserve energy is available the indicator will dim in proportion to ODEP limiting.

Construction: Black splatter-coat steel chassis with specially designed flow-through ventilation system.

Mounting: Standard EIA 310 front-panel rack mount with supports for supplemental rear corner mounting.

Dimensions: 19 inches wide, 3.5 inches high, 16 inches deep behind front mounting surface.

Weight: 41 lbs, 1 oz. Shipping; 45 lbs, 3 oz.