Crown 660A - Manual

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660A is a six-channel amplifi er

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
amplifi er 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,
fi tness 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.

Specifi cations

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.

Amplifi er 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

C O M M E R C I A L A U D I O S E R I E S

• Six inputs, six 60W amplifi er 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

• A d v a n c e d p r o t e c t i o n s y s t e m i n c l u d e s

output current limiting, DC protection, cir-
cuit breaker/fuse, and thermal protection;
details available online at www.crownau-
dio.com

• T h r e e - Ye a r, N o - F a u l t , F u l l y Tr a n s f e r a b l e

Warranty completely protects your invest-
ment and guarantees its specifi cations

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