CROWN-280A Commercial Amplifier

Click to enlarge

Crown 280A Commercial 70 Volt Amplifier
Crown 280A Amplifier

The Crown® 280A shall be an amplifi er for commercial and industrial audio. It provides 4-ohm and constant-voltage outputs (70V and 100V). The 280A has 2 inputs and dual 80W power amplifi ers for two-zone systems.

The 280A shall have the following specifications:

Minimum guaranteed power into 4 ohms or 70V/100V output: 80W maximum power at 1 kHz with 0.5% THD. Frequency Reponse (at 1 watt from 4-ohm tap): 70 Hz - 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: –70dB 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 degrees C to 40 degrees C at 95% relative humidity (non-condensing). Storage Temperature: –20 degrees C to 85 degrees C.

Front Panel Controls and Indicators

Front panel controls and indicators shall include the following:

Power Switch: Pushbutton on-off switch. Master Volume Controls: One per output channel, detented potentiometer with knob. Power Indicator: Blue LED indicates power on. Output Signal Presence Indicator: Green LED, one for each input channel, illuminates when input signal 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.

Rear Panel Controls and Connectors

Rear panel controls and connectors shall include the following:

Reset Button: Resets the circuit breaker that protects the power supply; 220/230/240V units shall have a fuse instead. AC Power Inlet: Detachable IEC. Auxiliary Power Input: 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: 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: 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 amplifi er channel.


Cooling shall be by convection. Included protection mechanisms shall be current limiting, over-temperature thermal cutout, and DC-fault load protection. Included accessories shall be a power cord, detachable rack ears, screws for rack ears, non-touch cover for output connectors, Phoenix-type connectors, and spade lugs. Optional accessories shall be a 1-VCAP remote volume control for one channel, and a 4-VCAP remote volume control for four channels. The dimensions of the amplifi er shall allow for 19 inch (48.3 cm) EIA standard (RS-310-B) rack mounting. The amplifi er shall be 3.5 inches (8.9 cm) high, and 12.2 inches (31 cm) deep behind the rack-mounting surface (not including the non-touch cover). The amplifi er shall weigh 25.3 lb (11.5 kg

We provide great low prices for professional audio video and lighting for churches and stage From bose speakers to Yamaha digital mixers

Sale ItemsAmp ComparisonMixer Shoot Out