Electro Voice Interface Alpha

Data[edit]

General

  • Manufacturer: Electro Voice
  • Model: Interface Alpha
  • Years of manufacture: ca. 1981-1982
  • Manufactured in: Nidau/Switzerland
  • Colour: walnut or oak veneer
  • Dimensions: 625 x 390 x 210 mm (HxWxD)
  • Weight: 14 kg
  • Original price approx.: 1950,- DM (pair with equalizer)


Technical data

  • Type: 2-way, closed with passive radiator, shelf / floorstanding speaker
  • drivers:
    • woofer: 1x 305 mm (passive cone).
    • midrange / bass driver: 1x 203 mm

Tweeter: 1x Super-Dome 38mm dome with acoustic lens

  • Power handling (nominal/music): 25W / 250W max.
  • Efficiency:
  • Sound pressure:
    • 92 dB (1 m/1 W input).

100 dB peak (3.6 W input) 108 dB peak (25 W input) 118 dB Peak (250 W Peak Input)

  • Frequency Response:
    • 30 - 18,000 Hz (±2.5 dB).

29 - 20,000 Hz (DIN)

  • Transition Ranges: 49 Hz (Acoustical) / 1,500 Hz (Electrical).
  • Dispersion angle:
    • 125 degrees (±30 degrees) at 500 - 8,000 Hz.

75 degrees (at 12,500 Hz)

  • Impedance: 8 ohms (nominal) / 5 ohms (min.)


Special Features

  • Successor of the Interface A, with new tweeter.
  • Difference to the Beta => designed as a shelf speaker, arrangement of the systems in the cabinet
  • stand BBR-2, to use the speaker as a floorstanding speaker
  • external equaliser (made in Nidau CH-2560) to attenuate the treble: slope 0/-3/-6 dB above 10kHz
  • dimensions: 205 x 65 x 155 mm (WxHxD)
  • Distortion max. 0.005% (20-20.000 Hz, 1V)

Remarks[edit]

  • European-made Interface Alpha is largely the same as the American-made Interface A series 3.

(power supply of the equalizer however 220V instead of 110/120V)


Pictures[edit]

Reports[edit]

Tested in German HiFi magazine Stereoplay 5/1981 (one of the four test winners)

Links[edit]