Filter
Top Products
COMMERCIAL AUDIO
T
he Crown
®
660A is a very flexible, high-value six-channel amplifier for commercial and industrial
audio. It provides 4-ohm and constant-voltage outputs (70V and 100V) on channels 1 through 4,
and 4-ohm outputs on channels 5 and 6. The 660A is a part of Crown’s Commercial Audio Series, which
also includes mixers and mixer-amps. These low-cost units provide all necessary features in a simple
building-block format.
SPECIFICATIONS
Frequency Reponse (at 1 watt from 4-ohm
tap): 100 Hz to 19 kHz +/- 1 dB.
Frequency Response (at line out): 20 Hz to 20
kHz +/- 1 dB.
Signal to Noise Ratio (ref. to rated power,
master volume at minimum): 85 dB.
DC Output Offset: < ±5 mV.
THD: Less than 0.5% at rated power at 1 kHz.
Input Sensitivity (for full output at maximum
gain): 800 mV.
Input Impedance (nominal): 100 kilohms.
Minimum Load Impedance:
100V output: 160 ohms.
70V output: 80 ohms.
4-ohm output: 4/8 ohms.
Crosstalk (all controls at “10”): –70 dB at
1kHz.
Load Impedance:
Ch. 1-4: 4 ohms and 70V/100V.
Ch. 5-6: 4 ohms.
AC Line Voltages Available:
100V 50/60 Hz
120V 60 Hz
220V 50/60 Hz
230V 50/60 Hz
240V 50/60 Hz
AC Voltage Tolerance: +10%/–20%.
Operating Temperature/Humidity: 0° C to 40°
C at 95% relative humidity (non-condensing).
Storage Temperature: –20° C to 85° C.
Front Panel Controls and Indicators
Power Switch: Pushbutton on-off switch.
Power Indicator: Blue LED indicates power on.
Output Signal Presence Indicator: Green LED,
one for each output channel, illuminates when
output signal level exceeds 100 mV (45 dB
below full power) from the 4-ohm tap.
Clip Indicators: Red LED, one per output
channel. Illuminates at threshold of audible
distortion.
Volume Controls: One per output channel.
Detented potentiometer with knob.
Tone Controls: Bass and Treble non-detented
potentiometers on each channel. Bass ±10 dB
at 100 Hz, Treble ±10 dB at 10 kHz.
Back Panel Controls and Connectors
Reset Switch: Resets the circuit breaker that
protects the power supply. 220/230/240V units
have a fuse instead.
Input Connectors: Detachable 3-pin Phoenix-
type, high-impedance balanced, one per chan-
nel.
AC Power Inlet: Detachable IEC.
Amplifier Outputs Connectors: One per
channel, 4-position terminal strip with COM
(Common), 4 ohms, 70V and 100V terminals
for channels 1-4 and one 4-position terminal
strip (4 ohms, + and – for each channel) for
channels 5 and 6. Accepts up to 10 AWG termi-
nal forks. Non-touch cover included.
VCA Connector: Each pair of channels has a 4-
pin Phoenix-type connector for two VCA control
lines of +10 VDC and ground. Compatible with
Crown 1-VCAP and 4-VCAP modules.
Cooling
Convection cooled.
Protection
Current Limit Protection: Included.
Thermal Limit Protection: Over-temperature
thermal cutout.
DC-Fault Load Protection: Included.
Turn On/Turn Off: No thumps or pops.
Included Accessories
Power cord
Detachable rack ears
Screws for rack ears
Non-touch cover for output connectors
Phoenix-type connectors
Spade lugs
Optional Accessories
1-VCAP remote volume control for one channel.
4-VCAP remote volume control for four chan-
nels.
Dimensions
EIA Standard 19-inch (48.3-cm) rack mount
width (EIA RS-310-B) with rack ears, 3.5-inch
(8.9-cm) height and 12.2-inch (31.0-cm) depth
behind the mounting surface (not including non-
touch cover). 4.1 inches (10.5 cm) high includ-
ing feet. 13.9 inches (35.2 cm) deep from front
of knobs to back of non-touch cover.
Weight
Net Weight:
30.3 lb (13.7 kg)
Shipping Weight:
35.3 lb (16.0 kg)
Regulatory Certifications
11/08 139754-1B