• Country
• Australia

• Manufacturer / Brand
• Manufacturers Special Products Pty. Ltd.(MSP); Sydney, NSW

• Year
• 1955 ??

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 311589

• Main principle
• Audio-Amplification

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm

• Material
• Metal case

• from Radiomuseum.org
• Model: 4" Speaker 4PU - Manufacturers Special Products

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 105 x 105 x 60 mm / 4.1 x 4.1 x 2.4 inch

• Notes

• Has in Impedance of 16 Ohms

• Net weight (2.2 lb = 1 kg)
• 0.419 kg / 0 lb 14.8 oz (0.923 lb)

• Author
• Model page created by Joshua Boxer. See "Data change" for further contributors.

• Other Models

• Here you find 19 models, 14 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Manufacturers Special Products Pty. Ltd.(MSP); Sydney, NSW