Restoring a IMF TLS50
Restoring a IMF TLS50
The IMF Electronics TLS50 is an iconic vintage British floorstanding loudspeaker renowned for its full passive transmission line enclosure design. Engineered to provide exceptionally deep, uncolored bass response without typical cabinet resonances, it achieves low-frequency extension reaching down to 23 Hz. Utilizing a mirror-imaged, 4-way driver array—comprising an 8-inch bextrene woofer, isolated midrange, tweeter, and super-tweeter—the TLS50 delivers remarkably neutral acoustic performance, sharp stereo imaging, and wide sound dispersion.
IMF Electronics TLS50
Technical Specifications & System Details
| System Type | 4-Way Passive Floorstanding Transmission Line |
| Frequency Range | 23 Hz to beyond audibility |
| Bass Unit (Woofer) | 8" (20.5 cm) Bextrene cone with large magnet |
| Midrange Unit | 4" (10 cm) cone in separate line termination |
| Tweeter | Dome High-Frequency unit |
| Super-Tweeter | Ultra-High-Frequency dome unit |
| Crossover | 4-way electrical at 375 Hz, 3 kHz, and 15 kHz |
| Nominal Impedance | 4 to 8 Ohms |
| Recommended Power | 30 – 70 Watts RMS |
| Dimensions (H × W × D) | 96 cm × 36 cm × 38 cm (36" × 14" × 15") |
| Net Weight | 27 kg (59.5 lbs) each |
