KEF Reference 8b
KEF Reference 8b subwoofer with dual Class D amplification, designed to deliver precise, powerful bass in a demanding Home Cinema installation.
Description
The KEF Reference 8b is an amplified subwoofer intended to complement a high-end Home Cinema installation, providing the low-frequency extension and control needed for sound effect reproduction.
Its design is built around two 500 W Class D amplifiers, each dedicated to driving a 228 mm driver. This dual-amplification architecture allows the control of each transducer to be separated, for a more precise low-frequency response. The two drivers are mounted back to back, an arrangement intended to limit vibrations transmitted to the cabinet through cancellation of opposing mechanical forces. They are designed for long excursion with very low distortion, an important point for maintaining definition even at high level. The cabinet itself is described as heavily braced and acoustically inert, two characteristics that help prevent unwanted resonances from the subwoofer.
This subwoofer is aimed at Home Cinema installations built around KEF's Reference range, or any demanding setup seeking precise, well-controlled bass rather than a simple increase in sound level.
What to check before buying used
On this type of amplified subwoofer, the first check concerns the control electronics on the rear panel: level, crossover frequency and phase controls, which must respond without crackling or poor contact. Both drivers should also be listened to separately at moderate volume to detect any sign of a worn suspension or a fault in one of the two Class D amplifiers. A check of the power supply and the on/standby switch remains essential, as this type of unit is used continuously. Finally, the braced cabinet should be examined for any impact that could have affected the acoustic inertness of the enclosure.
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