Power Base-3 & 1400CSL 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—500W/Ch
4 Ohm Stereo—700W/Ch
8 Ohm Bridge Mono—1500W
4 Ohm Parallel Mono—1050W
2 Ohm Parallel Mono—1515W
Load Impedances:
Rated for 16, 8, 4, and 2 (parallel
mono only) Ohm operation; safe with all types of loads,
even totally reactive loads.
AC Mains:
120VAC at 60 Hz with standard 3 wire
grounded 15A connector with single voltage trans-
former and fan for North American units; 100VAC,
120VAC, 220VAC, and 240VAC at 50 or 60 Hz when
equipped with universal transformer, applicable fan,
and other applicable hardware with country specific
power cord. Note that at 50 Hz fan speed is reduced.
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 170 milliwatts to 500 W at
26 dB gain.
Slew Rate:
>13V per microsecond.
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. High voltage
circuit breaker in main transformer primary and low
voltage 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 rocker on/off power switch.
Back Panel Controls:
A three-position switch which
selects Stereo, Bridge-Mono, or Parallel-Mono mode;
a two position input ground-lift switch, and level con-
trols for each channel.
Internal Controls:
A three-position switch selects 0.775V,
1.4V, or 26 dB voltage gain input sensitivity.
Indicators:
Red Enable indicator shows on/off status of
low-voltage power supply.
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:
36 lbs. Shipping; 40 lbs.
