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 Alpha
• Interface Gamma
• Interface Delta

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)

Reports

• Tested in German HiFi magazine Stereoplay issue 6/1982