Backes & Müller Sigma specifications

Category : Active speakers

General

Tech nical data

special features

• manufacturer: Backes & Müller
• model: Sigma
• type: speaker
• year of construction: 1984 - 1990
• Made in Germany
• colour: walnut, ash, black ash, mahogany, dark oak
• dimensions: 280 x 620 x 290 mm (WxHxD)
• weight: 20,5 kg
• factory price approx.: 3'700 DM (EIA, Pair)

• type: 4-way, closed, fully active
• Chassis:
  • woofer: 1x 245 mm paper cone, fixed (Backes & Müller )
  • mid:
    • Version 1: 1x 120 mm paper cone (Isophon )
    • Version 2: 1x 120 mm ceramic cone
  • mid-high range:
    • 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 amplifiers: (continuous/dynamic):
  • Version 1: 4x 80 watts
  • Version 2: 4x 70 watts
• frequency response:
• transition areas:
  • Version 1: 300/3000/6000 Hz
  • Version 2: 180/880/4000 Hz

• woofer: 1x 245 mm paper cone, fixed (Backes & Müller )
• mid:
  • Version 1: 1x 120 mm paper cone (Isophon )
  • Version 2: 1x 120 mm ceramic cone
• mid-high range:
  • 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

• Version 1: 1x 120 mm paper cone (Isophon )
• Version 2: 1x 120 mm ceramic cone

• Version 1: 1x 50 mm metal dome (Visaton)
• Version 2: 1x 50 mm ceramic cone

• Version 1: 1x 25 mm metal dome (Visaton)
• Version 2: 1x 25 mm metal dome tweeter

• Version 1: 4x 80 watts
• Version 2: 4x 70 watts

• Version 1: 300/3000/6000 Hz
• Version 2: 180/880/4000 Hz

• Controlled bass chassis
• Knobs for level and sensitivity

• Other models from the same series:
• Backes & Müller Beta
• Backes & Müller Delta
• Backes & Müller Omega
• Backes & Müller Sigma

• image: Backes & Müller Sigma

• report in "FonoForum" 11 / 1984

• stereo play book 12/1986
  • sound: very good
  • production quality: very good
  • "name and rank": top-class III (reference)

• sound: very good
• production quality: very good
• "name and rank": top-class III (reference)

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