KEF Reference Sub-8B Powered Subwoofer (Unit)

KEF Reference Sub-8B

The KEF Reference Sub-8B Powered Subwoofer delivers powerful and precise bass performance in a force-cancelled closed box design. With dual 9-inch LF drive units, it achieves a frequency range reaching as low as 18Hz in free-space mode, ensuring deep and impactful bass response. The subwoofer is equipped with two 500W Class D amplifiers featuring a switched mode power supply and DSP-based control section, providing efficient and controlled power delivery. The variable low pass filter allows customization between 40Hz to 160Hz with selectable slopes of 12dB/oct, 18dB/oct, and 24dB/oct. Additionally, the LFE mode, set at 350Hz with an 18dB/oct slope, enhances compatibility with LFE-equipped systems. The subwoofer offers versatile connectivity with analog XLR, speaker level inputs, and an RCA phono socket for linking. Its net internal volume is 23L, contributing to its compact yet potent design. While the KEF Reference Sub-8B impresses with its ability to reach a maximum output of 110dB, it is worth noting the substantial power consumption at 1000W, which users should consider in their setup.

 Key Features

1. Design: The KEF Reference Sub-8B features a force-cancelled closed box design, ensuring precise and controlled bass performance.
2. LF Drive Unit: Equipped with 2 x 225 mm (9in.) low-frequency drive units, the subwoofer delivers powerful and impactful bass.
3. Frequency Range: Achieves an impressive frequency range of 18Hz at -6dB output in free-space mode, providing deep bass extension.
4. Frequency Response: The frequency response at 90dB output in free-space mode is ±3dB from 24Hz, ensuring accurate and balanced bass reproduction.
5. Amplifier: Powered by 2 x 500W Class D amplifiers with a switched mode power supply and DSP-based control section, delivering efficient and controlled power.
6. Maximum Output: Capable of reaching a maximum output of 110dB at 1m and 50Hz, providing a dynamic and immersive bass experience.
7. Low Pass Filter: Features a variable low pass filter with a frequency range from 40Hz to 160Hz, allowing users to customize the crossover point.
8. Variable Slope: Offers variable slope options for the low pass filter at 12dB/oct, 18dB/oct, and 24dB/oct, enabling fine-tuning of the subwoofer’s integration with the main speakers.
9. LFE Mode: Includes an LFE mode set at 350Hz with an 18dB/oct slope, enhancing compatibility with LFE-equipped systems.
10. Inputs and Connectivity: Provides versatile connectivity options with analog XLR socket, speaker level inputs, and a link out via RCA phono socket. The subwoofer’s net internal volume is 23L.

Specifications