KEF Model 105 Series II (1979) | Reference Series

 

The KEF Model 105 Series II is a legendary Reference Series loudspeaker originally introduced in 1977 and widely adopted by audio laboratories and manufacturers as a benchmark for evaluating high-fidelity equipment. Building on the success of the original Model 105, the Series II incorporates significant technical improvements, advanced computer-aided digital analysis, and precision manufacturing techniques pioneered by KEF in the early 1970s. Each drive unit and crossover network is individually measured, digitally analyzed, and carefully matched before assembly, ensuring paired speakers differ by less than 0.5dB in frequency response and remain within 1dB of the original prototype across the full frequency range. The three-way design features acoustically isolated enclosures optimized for specific frequency bands, a curved and adjustable mid/high-frequency head assembly for reduced off-axis coloration and precise stereo imaging, and a redesigned bass enclosure engineered using modal analysis to minimize cabinet vibration and distortion. The B300 bass driver benefits from optimized 3-point mounting, improved internal bracing, enhanced acoustic damping, and mechanical isolation to reduce coloration and improve bass clarity. The integrated S-STOP (Steady State and Transient Overload Protection) system provides self-powered electronic protection against peak voltage spikes, thermal overload, and excessive low-frequency excursion, automatically reducing input levels when safe limits are exceeded and restoring normal operation once stabilized. Renowned for its neutral frequency response, stable stereo perspective, high output capability, and exceptional tonal accuracy, the KEF Model 105 Series II remains a benchmark vintage high-end loudspeaker for audiophiles, collectors, and serious hi-fi enthusiasts seeking reference-grade sound performance. Specifications: 965x415x455 mm | Weigth 36 kg | 300mm low frequency driver, 110mm mid-frequency driver, 25mm tweeter with Bextrene diaphragm | Impedance 8ohm | Power rating 200 W | Frequency response 30 to 25.000Hz

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