Overview Reference 4 Meta is the larger centre speaker in KEF's Reference series. KEF describes it as a centre speaker that can also be used as a left, centre or right (LCR) speaker. It is a three-way bass reflex design with a 12th generation Uni-Q driver array with Metamaterial Absorption Technology (MAT) and four 165 mm bass drivers. Hand-built by KEF in Maidstone, Kent, UK. KEF states that every pair is matched to within 0.5 dB of its laboratory-maintained reference standard. Drivers and Technology 12th generation Uni-Q driver array with a 25 mm aluminium dome tweeter and 125 mm aluminium cone midrange, with KEF's tangerine waveguide Metamaterial Absorption Technology (MAT) behind the tweeter, which KEF states absorbs 99% of the unwanted sound from the rear of the tweeter Midrange motor with a copper ring in the motor gap to reduce inductance, and a flexible decoupling chassis that isolates the Uni-Q array from the cabinet 165 mm (6.5 in.) aluminium cone bass drivers with a vented magnet assembly and large aluminium voice coil Flexible Port Technology with two port tube options (short and long) so bass output can be adjusted to suit the room Shadow Flare front baffle surface designed to reduce cabinet diffraction around the Uni-Q array Cabinet shape and bracing designed with finite element analysis, with Constrained Layer Damping Home Theatre Use Centre channel speaker that KEF also specifies for left, centre and right (LCR) use Shares the same Uni-Q with MAT driver array as the other Reference Meta models Reference Meta cloth grille set available separately Specifications Design Three-way bass reflex Drive units Uni-Q driver array: HF 25 mm (1 in.) aluminium dome with MAT, MF 125 mm (5 in.) aluminium cone. LF 4 x 165 mm (6.5 in.) aluminium cone Frequency response (±3dB) 48 Hz to 35 kHz Frequency range free field (-6dB) Short port: 43 Hz to 45 kHz. Long port: 40 Hz to 45 kHz Typical in-room bass response (-6dB) 33 Hz Crossover frequencies 450 Hz, 2.1 kHz Amplifier requirements 50 to 400 W Sensitivity (2.83V/1m) 88 dB Harmonic distortion, 2nd and 3rd harmonics (90dB, 1m)
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