Model M Dynamic Reproducer 8M

Rola Company (AUS) Pty. Ltd.; Melbourne

Dati
Forum
Immagini
Collezioni

  • Anno
  • 1947–1952
  • Categoria
  • Altoparlante, cuffia o auricolare
  • Radiomuseum.org ID
  • 316454

 Specifiche tecniche

  • Gamme d'onda
  • - senza
  • Altoparlante
  • Ø 8 inch = 20.3 cm
  • Materiali
  • Vari materiali
  • Radiomuseum.org
  • Modello: Model M Dynamic Reproducer 8M - Rola Company AUS Pty. Ltd.;
  • Annotazioni

  • This loudspeaker is similar design to Model 8K but is fitted with a larger magnet. This results in a further increase in electro-acoustic efficiency and in still better transient response than that of Model 8K. For this reason Model 8M is specially recommended for use in battery or vibrator operated console and table model radio receivers, in portable amplifiers, sound systems, and for other application where an 8-inch loudspeaker possesing higher-than-standard efficiency is needed.

    Power Handling Capacity 7 watts, 10 watts peak.
    Fundamental Diaphragm Resonance 85-95 c.p.s. (Hz) (F61 Cone).
    Voice Coil Impedance 2 ohms at 400 c.p.s. (Hz)
    Transformer C. type Isocore transformer, attatched or detatched for chassis mounting.
    Principal Dimensions Overall diameter of diaphragm housing .. .. .. .. .. ..  8 1/16"
    Diameter of baffle opening .. .. .. .. .. .. .. .. .. .. .. ..  7"
    Diameter of voice coil .. .. .. .. .. .. .. .. .. .. .. .. .. ..  1"
    Depth from pad-ring to rear, including transformer .. 4"
    Mounting Four slots spaced 90º apart on a 7 19/32" pitch circle diameter. Dimensions of the slots 5/16" x 7/32"
    Finish Diaphragm housing bright cadmium plated; magnet black and lacquered, transformer can silver lacquered.
    Weight 2 lb. 13 ozs. (including transformer).

    REPLACEMENT INFORMATION

    Model 8M can be used as a replacement for the 8-inch PM type Models 8/20, 8/21, and GM8 in the PM series and Model K7 in the electro-dynamic series. When replacing Model K7 with a Model 8M a Type 14/60 choke and a series resistance of suitable value to simulate the original field coil resistance must be used. When the car radio type GM8 is replaced with Model 8M the field supply is not needed. The new loudspeaker is fitted under dash baffle of the car.

  • Letteratura / Schemi (1)
  • - - Manufacturers Literature (Rola Loudspeaker Catalogue, August 1948.)
  • Autore
  • Modello inviato da Martin Kent. Utilizzare "Proponi modifica" per inviare ulteriori dati.

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