The Crown® 660A is a 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 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 mixeramps. 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.
The amplifiers vary in their number of inputs, number of outputs, and power range:
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.
660A has six inputs and six amplifier output channels
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, circuit breaker/fuse, and thermal protection
Three-Year, No-Fault, Fully Transferable Warranty completely protects your investment and guarantees its specifications
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.
Crosstalk (all controls at “10”): –70 dB at 1kHz.
Line Output Level (nominal): 1V into 10 kilohms.
AC Line Voltages Available:
100V 50/60 Hz
120V 60 Hz
220V 50/60 Hz
230V 50/60 Hz
240V 50/60 Hz
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. The
power switch does not affect the 24V DC auxiliary
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.
Master 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.
AC Power Inlet: Detachable IEC.
Auxiliary Power Input (not in 660A): 2-position terminal strip for 24 VDC (±10%) backup power.
Accepts up to 14 AWG terminal forks.
Amplifi er Outputs Connectors: One per channel, 4-position terminal strip with COM (Common), 4 ohms, 70V and 100V terminals. Accepts up to 10 AWG terminal forks. Non-touch cover included.
Output VCA Connector: One for every two channels, 4-pin Phoenix-type connector for two VCA
control lines of +10 VDC and ground. Compatible with Crown 1-VCAP and 4-VCAP modules.
Line Out Connector (not in 660A): One 3-pin balanced Phoenix-type connector per output channel.
Post master, pre-VCA. Level controlled by master volume control.
Amp Input Connector:
3-pin Phoenix-type, high-impedance balanced, one per amplifer channel.
Current Limit Protection: Included.
Thermal Limit Protection: Over-temperature
DC-Fault Load Protection: Included.
Detachable rack ears
Screws for rack ears
Non-touch cover for output connectors
1-VCAP remote volume control for one channel.
4-VCAP remote volume control for four channels.
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 including feet. 13.9
inches (35.2 cm) deep from front of knobs to back
of non-touch cover.
280A back panel. 180A and 1160A are similar except for the number of channels.