Electro Voice Interface Alpha

Data

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

• Other models in the same series:
• Electro Voice Interface Beta
• Electro Voice Interface Gamma
• Electro Voice Interface Delta

• 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)

Reports

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

Links

• data and pictures at HiFi Studio