Electro Voice Interface Beta

Data

General

  • Manufacturer: Electro Voice
  • Model: Interface Beta
  • Years of manufacture: ca. 1981-1982
  • Manufactured in: Nidau/Switzerland
  • Colour: walnut or oak veneer
  • Dimensions: 775 x 405 x 280 mm (WxHxD)
  • Weight: 19 kg
  • Original price approx.: 2800,- DM (pair with equalizer)


Technical data

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

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

  • Power handling (nominal/music): 25W / 250W
  • 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 - 18000 Hz (±2.5 dB).

26 - 20000 Hz (DIN)

  • Transition Ranges: 42 Hz (Acoustical) / 1500 Hz (Electrical)
  • Coverage angle:
    • 125 degrees (±30 degrees) at 500 - 8000 Hz.

75 degrees (at 12500 Hz)

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


Special Features

  • external equalizer to attenuate the treble radiation: slope 0/-3/-6 dB starting at 10kHz
  • successor of the Interface B, with new tweeter
  • difference to the Alpha => integrated stand, arrangement of the systems in the cabinet


  • external equalizer CH-2560 to influence the treble filter slope (0/-3/-6 dB from 10kHz)
  • dimensions: 205 x 65 x 155 mm (WxHxD).
  • distortion max. 0.005% (20-20000 Hz, 1V)

Remarks

Other models of the same series:

Interface Beta, manufactured in Europe, is largely the same as Interface B series 3, manufactured in America. (power supply of the equalizer however 220V instead of 110/120V)

Pictures

Reports

  • Tested in German HiFi magazine Stereoplay issue 6/1982

Links