• Year
  • 1946–1952
  • Category
  • Loudspeaker, headphone or earphone
  • Radiomuseum.org ID
  • 311365

 Technical Specifications

  • Main principle
  • Audio-Amplification
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3 inch = 7.6 cm
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Dynamic Reproducer 3C - Rola Company AUS Pty. Ltd.;
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 90 x 90 x 60 mm / 3.5 x 3.5 x 2.4 inch
  • Notes
  • This was the first post-war model Rola loudspeaker to be made for the domestic radio receiver market. During the war Model 3C was supplied to the Services for use in walkie-talkie sets and proved itself in the jungles of New Guinea and the islands of the Pacific. In this model the use of Anisotropic Alnico magnet results in a much higher electro-acoustic output than that usually obtained from loudspeakers of this size and this makes possible the design of ultra small and "personal portable" receivers. Model 3C can also be used in midget AC receivers and for amplifier monitoring. Inter-office communication systems have also been designed around the Model 3C.

    Power Handling Capacity .5 watts max.
    Fundamental Diaphragm Resonance 225-250 c.p.s. (F94 Cone).
    Voice Coil Impedance 3.7 ohms at 400 cycles.
    Transformer "G" type isocore, attached, or detached for chassis mounting
    Principal Dimensions Diaphragm Housing .. .. .. .. .. .. .. .. .. .. .3 9/16" x 3 9/16"
    Maximum overall height including transformer .. .. .. 4 1/16"
    Diameter of baffle opening.. .. .. .. .. .. .. .. .. .. .. .. . 2¾"
    Diameter of voice coil.. .. .. .. .. .. .. .. .. .. .. .. .. .. . ½"
    Depth from pad-ring to rear, including transformer .. 2 9/32"
    Mounting Four holes .196" spaced 90º apart on a pitch circle diameter of 3 15/16"
    Finish Diaphragm housing and transformer mounting bracket bright cadmium plated, magnet black, laquered can and transformer silver laquered.
    Weight 6½ ozs.(without transformer, 8½ ozs. (with transformer).

    Superseded by Fluxmaster Model 3C.

  • Net weight (2.2 lb = 1 kg)
  • 0.135 kg / 0 lb 4.8 oz (0.297 lb)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Rola Loudspeaker Data & various Rola Technical Bulletins.)
  • Author
  • Model page created by Joshua Boxer. See "Data change" for further contributors.

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