Com-Tech 1600 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—540W/Ch
4 Ohm Stereo—875W/Ch
70-V Line Stereo—890W/Ch
8 Ohm Bridge Mono—1720W
4 Ohm Parallel Mono—1080W
2 Ohm Parallel Mono—1750W
Bridge Mono, 140-V Line—1780W
Parallel Mono, 70-V Line—1765W
Load Impedances:
Rated for 16, 8, 4, 2, Ohm, and 70-
V use. 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 units
are available when ordered country specific. Com-
Tech amplifiers are not voltage convertable.
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.
Mechanical
Input Connectors:
Balanced three-terminal barrier block
for each channel on standard P.I.P.-BB module (in-
cluded)
Output Connectors:
Four-terminal barrier block.
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 two position recessed switch for
each channel selects between 8/4 ohm and 70-V
modes. A push button circuit breaker used to protect
the power supply.
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. A green indicator for
each channel shows the reserve energy status. If no
reserve energy is available the indicator will dim in
proportion to ODEP limiting. A yellow indicator for
each channel flashes in the event of distortion. And
green SPI (signal presence indicator) indicators show
the presence of output signal.
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, 7 inches high, 16 inches
deep behind front mounting surface.
Weight:
57 lbs, 14 oz. (26.3 kg)
