Restoring a IMF TLS80
Restoring a IMF TLS80
The IMF TLS80 is a legendary British full-range transmission-line loudspeaker developed by IMF Electronics in the 1970s. Celebrated for its effortless sub-bass extension, wide dynamic scale, and uncolored soundstage, it utilizes a complex internal maze-like line to damp rear-wave output while delivering deep, linear low-frequency response. Featuring a iconic driver array—including the oval KEF B139 woofer and specialized Celestion tweeters—the TLS80 stands as an audiophile classic, renowned for its musicality, precise detail, and smooth, fatigue-free performance across the frequency spectrum.
| Specification | Details |
|---|---|
| Enclosure Type | 4-Way Full Line Transmission Line |
| Bass Driver | KEF B139 (Flat oval polystyrene diaphragm) |
| Midrange Driver | KEF B110 (5-inch Bextrene cone in isolated line) |
| Tweeter | Celestion HF1300 (1-inch pressure dome) |
| Super Tweeter | Celestion HF2000 (3/4-inch ultra-high frequency dome) |
| Frequency Range | 20 Hz – 20,000 Hz (±3dB) |
| Crossover Frequencies | 375 Hz, 3.5 kHz, 15 kHz |
| Nominal Impedance | 4 to 8 Ohms |
| Recommended Power | 40W – 150W RMS per channel |
| Cabinet Finish | Walnut or Teak real wood veneer |
| Dimensions (H × W × D) | 985 mm × 450 mm × 508 mm (38.8" × 17.7" × 20") |
| Weight | 50 kg (110 lbs) per speaker |
