Scan-Dyna A-25 specifications

Category : Speakers

General

Tech nical data:

special features

• manufacturer: Scan-Dyna
• model: A-25
• type: speaker
• year of construction: 1968 - 1974
• Made in Denmark
• color: walnut
• dimensions: 290 x 500 x 250 mm (WxHxD)
• weight: 9 kg
• factory price approx.: 345 DM

• type: 2-way a-periodic (semi-open, "Acoustic Resistor" / "Resistive Port/Vent" as Dynaudio Variovent)
• Chassis:
  • woofer: 250 mm cone, SEAS H-336 (according to beading) / type 25TV-EM (according to the sticker), 4 643961b8da111c0a15d770a1109a86d4s
  • midrange:
  • tweeter: 40 mm dome tweeter, SEAS H-087, 6 643961b8da111c0a15d770a1109a86d4s (measured: 4,8 643961b8da111c0a15d770a1109a86d4)
• load capacity (Nenn-/Musikb.): 35 W / 90 W
• Efficiency: 88 dB / W / m
• Frequency response: 32 - 20'000 Hz
• Transition ranges: 1'500 Hz
• Impedance: 4 643961b8da111c0a15d770a1109a86d4s

• Woofer: 250 mm cone, SEAS H-336 (according to surround) / Type 25TV-EM (according to Sticker), 4 ohm
• Midrange driver:
• Tweeter: 40 mm Dome, SEAS H-087, 6 ohm (measured: 4.8 ohm)

• Aperiodic damping system
• Removable front
• Height adjustment of 5 positions for listening room adjustment with the following features:
  • 1) Weak Increase
  • 2) Linear frequency response
  • 3) Weak attenuation - Referred to as normal (probably meant typical listening room)
  • 4) Slightly stronger attenuation for "hard" rooms
  • 5) Strong attenuation

• 1) Weak increase
• 2) Linear frequency response
• 3 ) Weak attenuation - Called normal (probably meant typical listening room)
• 4) Slightly stronger attenuation for "hard" rooms
• 5) Strong attenuation

• Other models of the same series:
• Receiver:
• Scan-Dyna 2000
• Scan-Dyna 2400
• Scan-Dyna 3000
• Scan-Dyna 4000

• Turntable:
• Scan-Dyna 1400
• Scan-Dyna 1700

• Speaker:
• Scan-Dyna A-10
• Scan-Dyna A-20
• Scan-Dyna Dyna A-25
• Scan-Dyna A-25 II
• Scan-Dyna A-30
• Scan-Dyna A-30 II

• Headphones:
• Scan-Dyna K-72x

• Picture: Scan-Dyna 3000, A-25

• Excerpt from brochure: Scan-Dyna A-10, A-20, A-25, A-30

• Picture / Scheme: Scan-Dyna A-25

• Aperiodic: Manufacturer's Comment (from article by J. Gordon Holt, 1. Dec. 1969; about the first A25 version)
• The aperiodic design is not a bass-reflex approach, since there is no acoustic output through the port. The characteristics of the "plug" in the port are quite critical, necessitating individual adjustment of each system. This added acoustic impedance damps the woofer, improving its response to transient signals. Examination of the woofer cone motion shows that, with this aperiodic design (on which patents are pending), the cone follows the input signal all the way down to DC with far greater precision than is the case with either bass-reflex or acoustic-suspension designs. Dynaco

• Dynaudio called this design Dynaudio Variovent and at Scan-Speak it was "Flow Resistance Vent"

• https://diyaudioprojects.com/Tech nical/Aperiodic/

• https://www.stereophile.com/content/dynaco-25-loudspeaker

Comment:

Comment box:

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