Crown 280A

The Crown 280A is a commercial and industrial audio power amplifier designed for multi-zone sound reinforcement applications. It features dual 80W power amplifiers, capable of driving both 4-ohm loads and constant-voltage outputs at 70V or 100V, making it suitable for various installation requirements. Its robust construction and convection cooling system are engineered for consistent performance and longevity in demanding environments. The amplifier offers two input channels and is designed for straightforward integration into existing audio systems.

### Technical Specifications

**Performance:**

* **Minimum Guaranteed Power Output:** 80W per channel into 4 ohms or 70V/100V output at 1 kHz with 0.5% THD.
* **Frequency Response (at 1 watt from 4-ohm tap):** 70 Hz – 19 kHz ±1 dB.
* **Frequency Response (at line out):** 20 Hz – 20 kHz ±1 dB.
* **Power Bandwidth (at 4-ohm tap, 2 dB below maximum 1 kHz power):** 50 Hz – 20 kHz with < 0.5% THD. * **Signal to Noise Ratio:** 85 dB (ref. to rated power, master volume at minimum). * **DC Output Offset:** < ±5 mV. * **Total Harmonic Distortion (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:** –70 dB at 1kHz (all controls at “10”).**Electrical:*** **AC Line Voltages Available:** 100V 50/60 Hz, 120V 60 Hz, 220V 50/60 Hz, 230V 50/60 Hz, 240V 50/60 Hz. * **Auxiliary Power Input:** 2-position terminal strip for 24 VDC (±10%) backup power.**Interfaces:*** **Inputs:** * 2 balanced Phoenix-type line inputs. * High-impedance balanced. * **Outputs:** * Dual 80W power amplifiers for two-zone systems. * 4-ohm outputs. * 70V constant-voltage outputs. * 100V constant-voltage outputs. * 4-position terminal strip for each channel (COM, 4 ohms, 70V, 100V). * **Line Out Connector:** One 3-pin balanced Phoenix-type connector per output channel, post master, pre-VCA, level controlled by master volume control. * **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.**Physical:*** **Dimensions:** * 19 inch (48.3 cm) EIA standard (RS-310-B) rack mount width with rack ears. * 3.5 inches (8.9 cm) high. * 12.2 inches (31 cm) deep behind the rack-mounting surface (not including the non-touch cover). * 13.9 inches (35.2 cm) deep from front of knobs to back of non-touch cover. * **Weight:** 25.3 lb (11.5 kg) net weight. * **Cooling:** Convection cooled.**Front Panel Controls and Indicators:*** **Power Switch:** Pushbutton on-off switch. * **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. * **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.**Protection Mechanisms:*** Output current limiting. * Over-temperature thermal cutout. * DC-fault load protection. * Circuit breaker/fuse.**Included Accessories:*** Power cord. * Detachable rack ears. * Screws for rack ears. * Non-touch cover for output connectors. * Phoenix-type connectors. * Spade lugs.**Optional Accessories:*** 1-VCAP remote volume control for one channel. * 4-VCAP remote volume control for four channels.Why Choose Aumictech for the Crown 280A? At Aumictech, we specialize in supplying high-end audio reinforcement equipment. Whether you need reliable multi-zone amplification, flexible constant-voltage output options, or robust system integration, our team ensures the Crown 280A delivers maximum performance for your application.