Description
- Manufacturer: Rola Company (Aust.) Pty. Ltd., Melbourne.
- Era: approximately 1948–1952 for this model generation.
- Type: permanent-magnet dynamic speaker (not the earlier field-coil type).
- Power handling: about 7 watts.
- Voice-coil impedance: 2 Ω at 400 Hz according to Rola's later specifications.
- Magnetic gap: approximately 12,000 gauss.
- Diameter: nominally 12 inches.
- Rola offered the 12-O with different cones, including F22, F28 and F29, which changed its response characteristics. The F29 version was intended particularly for larger radiograms and had response specified from roughly 70 Hz to 9 kHz.
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