Crown Audio 660A specifications Features, Performance, Front Panel Controls and Indicators

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

660A

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.

Features

• Six inputs, six 60W amplifier output channels;	• Advanced protection system includes
4-ohm and 70V/100V outputs	output current limiting, DC protection, cir-
• Ideal for commercial and industrial use	cuit breaker/fuse, and thermal protection;
	details available online at www.crownau-
• Balanced Phoenix-type line inputs; touch-
	dio.com
proofed screw-terminal speaker outputs	• Three-Year, No-Fault, Fully Transferable
	Warranty completely protects your invest-
	ment and guarantees its specifications

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.

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.

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.

660A	*1 kHz
	Power
Minimum guaranteed power
into 4 ohms or 70V/100V	60W
output

*1 kHz Power: refers to maximum power in watts at 1 kHz with 0.5% THD.

Included Accessories

Power cord Detachable rack ears Screws for rack ears

Non-touch cover for output connectors Phoenix-type connectors

Spade lugs