The Crown®660A is a six-channel amplifier
for commercial and industrial audio. It pro-
vides 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 has six inputs and six 60W power
amplifier channels for multi-zone systems. It can
drive different types of speakers in different areas
of a facility.
Some applications include schools, hospitals,
factories, restaurant/retail, houses of worship,
fitness facilities, A/V boardrooms, 5.1 surround
systems, courtrooms, and prisons. Typical uses
are paging, background music, security and
evacuation instructions.
The amp is 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.
The sound system can be upgraded as a facility
expands. For example, you can add more mixers
for more inputs, or add more power amps (or
mixer-amps) to handle more zones.
Specifications
Performance
Frequency Reponse (at 1 watt from 4-ohm tap):
70 Hz to 19 kHz +/- 1 dB.
Frequency Response (at line out): 20 Hz to 20
kHz +/- 1 dB.
Power Bandwidth (at 4-ohm tap, 2 dB below
maxium 1 kHz power): 50 Hz to 20 kHz with
< 0.5% THD.
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 channel.
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 terminal 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
COMMERCIAL AUDIO SERIES
• Six inputs, six 60W amplifier output channels;
4-ohm and 70V/100V outputs
• Ideal for commercial and industrial use
• Balanced Phoenix-type line inputs; touch-
proofed screw-terminal speaker outputs
• Advanced protection system includes
output current limiting, DC protection, cir-
cuit breaker/fuse, and thermal protection;
details available online at www.crownau-
dio.com
• Three-Year, No-Fault, Fully Transferable
Warranty completely protects your invest-
ment and guarantees its specifications
Features
1 kHz
Power
60W
Minimum guaranteed power
into 4 ohms or 70V/100V
output
660A
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
*
660A
