Dynamic Reproducer 6K

Rola Company (AUS) Pty. Ltd.; Melbourne

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  • Year
  • 1947
  • Category
  • Loudspeaker, headphone or earphone
  • Radiomuseum.org ID
  • 315273

 Technical Specifications

  • Wave bands
  • - without
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6 inch = 15.2 cm
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Dynamic Reproducer 6K - Rola Company AUS Pty. Ltd.;
  • Notes

  • This is a highly efficient 6-inch loudspeaker intended specially for use in in compact vibrator, battery operated, and car radio receivers where economy of audio power is an important requirement. Its Anisotropic Alnico magnet is larger in diameter and is deeper than that used in Model 6H. The resultant high concentration of flux in the air gap improves the transient response of Model 6K and this is one of the reasons why this model is often used in high quality AC receivers. The larger magnet also results in a 3dB increase in the electro-acoustic effiency of Model 6K over that obtained in the model 6H. This means a virtual doubling of the sound obtained from a given input power, a very valuable aid to designers of battery and vibrator receivers.

    Power Handling Capacity 5 watts
    Fundamental Diaphragm Resonance 110-120 c.p.s. (F81 Cone).
    Voice Coil Impedance 3.7 ohms at 400 c.p.s.
    Transformer D. type Isocore transformer, attatched or detatched for chassis mounting.
    Principal Dimensions Overall diameter of diaphragm housing .. .. .. .. .. ..  6 9/16"
    Diameter of baffle opening .. .. .. .. .. .. .. .. .. .. .. ..  5½"
    Diameter of voice coil .. .. .. .. .. .. .. .. .. .. .. .. .. ..  ¾"
    Depth from pad-ring to rear, including transformer .. 3⅜"
    Mounting Four slots spaced 90º apart on a 6 3/16" pitch circle diameter. Dimensions of the slots 13/64" x 9/32". A speaker mounting bracket is fitted on the front plate. Two clearance holes for 3/16" screws are provided a 2¼" centres.
    Finish Diaphragm housing bright cadmium plated; magnet black and lacquered, transformer can silver lacquered.
    Weight 2 lb. 6 ozs. (including transformer).

    REPLACEMENT INFORMATION

    Model 6K can be used to replace Model 6/15 and because of its highly efficient Anisotropic Alnico magnet, will give a higher acoustic output from the receiver than was obtained with the older Model 6/15 loadspeaker.

  • Literature/Schematics (1)
  • - - Manufacturers Literature (Rola Loadspeaker Catalogue (1948))
  • Author
  • Model page created by Martin Kent. See "Data change" for further contributors.

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