Tannoy GRF-15
Not much is documented about the Tannoy GRF-15. It shows up in period test reports as a 15-inch Tannoy loudspeaker system. No confirmed official specification sheet, production dates or original price have turned up in the available record.
The best account is in High Fidelity (March 1962, p.62). It reported that the GRF-15-inch combination gave the deepest bass and the most substantial overall sound among a group of Tannoy models that included a 12-inch and an older Tannoy. On pure test tones, response held up strongly to about 35 Hz, then rolled off gently. Some output was still apparent below 25 Hz at reduced amplitude. A later High Fidelity item (May 1968, p.57) noted several new Tannoy enclosures for the 15-inch speaker. That suggests this model - or its direct successor - stayed in the lineup into the late 1960s.
- 15-inch loudspeaker system
- Bass response: strong to ~35 Hz; some output below 25 Hz (per High Fidelity, March 1962)
- Still referenced in Tannoy's 15-inch enclosure lineup in May 1968
Other surviving literature on the GRF-15 is thin, and no further verified specifications are known.
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