GRF Professional
| Brand | Tannoy |
| Function | Speaker |
| Produced | 1968 |
| Country | United Kingdom |
| Model ID | G.R.F. Professional |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 106.7 × 132.1 × 55.9 cm (W × H × D) |
| Frequency Response | 30Hz-20kHz |
| Driver | 15" Dual Concentric (Monitor Red) (AlNiCo Magnet (Ticonal-G), PepperPot Waveguide Woofer: Paper Cone, 2" Voice Coil Treble: 2" Aluminum Alloy Dome) |
| Impedance | 16Ω |
| Efficiency | 10% |
| Power Handling | 50W |
| Crossover Frequency | 350Hz (Acoustic), 1000Hz |
| Enclosure Type | Compound Horn |
| Finish | Walnut |
| Connections |
|