Restoring a KEF Concerto
Restoring a KEF Concerto
The KEF Concerto (and its modern successor, the Q Concerto Meta) stands as an iconic three-way loudspeaker design. Originally introduced in 1969 as KEF’s flagship domestic monitor, it gained renown for pairing the famous B139 racetrack woofer, B110 midrange, and T27 tweeter to deliver deep bass and exceptionally cohesive imaging. Reimagined in the modern Q Series line, the updated design combines KEF’s 12th-generation Uni-Q driver array with Metamaterial Absorption Technology (MAT) and a dedicated hybrid aluminum bass unit. It delivers remarkable acoustic neutrality, rich clarity, and precise dispersion.
| Specification | Detail |
|---|---|
| Production Years | 1969 – 1977 |
| System Type | 3-way reflex floor-standing / large monitor |
| Low-Frequency Driver | B139 (oval / "racetrack" flat piston bass unit) |
| Mid-Range Driver | B110 (5-inch Bextrene cone) |
| High-Frequency Driver | T27 (¾-inch Melinex dome tweeter) |
| Frequency Range | 30 Hz – 30,000 Hz |
| Crossover Frequencies | 400 Hz, 3,500 Hz |
| Nominal Impedance | 8 Ω |
| Power Handling / Rating | 30 W continuous program |
| Cabinet Dimensions (H × W × D) | 711 × 432 × 305 mm (28 × 17 × 12 in) |
| Weight | 22.7 kg (50 lbs) per cabinet |
