Backes & Müller Sigma

Data

General

  • Manufacturer: Backes & Müller
  • Model: Sigma
  • Type: Loudspeaker
  • Years of manufacture: 1984 - 1990
  • Made in: Germany
  • Color: walnut, ash, ash black, mahogany, oak dark
  • Dimensions: 280 x 620 x 290 mm (WxHxD)
  • Weight: 20,5 kg
  • Original price approx.: 3'700 DM (RRP, pair)


Technical data

  • Type: 4-way, closed, fully active
  • drivers:
    • Low frequency: 1x 245 mm paper cone, regulated (Backes & Müller).

midrange:

      • version 1: 1x 120 mm paper cone (Isophon)
      • version 2: 1x 120 mm ceramic cone
    • midrange/high frequency:
      • version 1: 1x 50 mm metal dome (Visaton)
      • version 2: 1x 50 mm ceramic cone

Tweeter:

      • version 1: 1x 25 mm metal dome (Visaton)
      • version 2: 1x 25 mm metal dome tweeter
  • Power output stages: (continuous/dynamic):
    • Version 1: 4x 80 Watt
    • Version 2: 4x 70 Watt
  • Frequency response:
  • Transition Ranges:
    • Version 1: 300/3000/6000 Hz
    • Version 2: 180/880/4000 Hz


Special Features

  • Regulated bass chassis
  • Control for level and sensitivity


Remarks


Pictures

  • Image: Backes & Müller Sigma

Backes & Müller Sigma-1984.jpg


Reports

  • Report in "FonoForum" 11 / 1984
  • Stereoplay issue 12/1986

Sound: very good

    • Manufacturing quality: very good
    • "Rank and Name": Top Class III (Reference)
"The B&M Sigma, for example, sounded quite soft in the bass, but abysmally deep and powerful..."


Links