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Micro-Tech 1200 Amplifier Service Manual
6
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.
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.