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ARCHITECT'S AND ENGINEER'S SPECIFICATIONS

The 2280A Incremental Power Amplifier System shall consist of a main frame which contains a primary ac power control module and up to eight 2271 power output modules. Each channel input shall have stepped attenuation in 1 dB increments, to a maximum of -63 dB. The main frame shall accommodate an optional balanced input transformer for each of the eight input channels. The main frame shall include connectors for eight separate outputs and eight separate inputs. The main frame shall include a combination ac power-switch/circuit-breaker/pilot-lamp and a cooling fan capable of cooling up to eight 70V power amplifier modules. The main frame shall include a power supply capable of supporting a full complement of modules and shall be adaptable to 100/120/200/220/240 Vac operation.
The amplifier system shall meet the following performance specifications. Power output, 624W maximum at 70 volts (78W per output, module). Power output at clip, 110W for 1 power amplifier module at 1 kHz; 720W for 8 power amplifier modules at 1 kHz; 600W for 8output power modules at 1 kHz with 90% line voltage.
Frequency response, ±.25 dB from 20 Hz to 20 kHz. Signal to noise, 100 dB unweighted from 20 Hz to 20 kHz. Distortion, 0.1 THD with not more than 6 power amplifier modules in parallel; .05% THD with 8 output power amplifier modules in parallel; 0.1% IM from 0.011W to 78W per power amplifier module. Sensitivity, 0.775V. Input impedance, 15,000 ohms balanced or unbalanced. Common mode rejection ratio, 85 dB at 60 Hz. Cross talk, 70 dB at 1 kHz. DC offset, less than 100 millivolts. Slew rate, 15V per microsecond. Damping factor, 57:1 at 100 Hz. Phase shift, typically +25° -45° from 20 Hz to 20 kHz. The amplifier system shall operate from a power source of 100/120/200/220/240 Vac at 50/60 Hz.
The amplifier system shall be 175/s" D x 19" W x 7" H and shall weigh 70 pounds with 8 output power amplifier modules installed.
The amplifier system shall be the ALTEC LANSING 2280A Incremental Power System.