Raymond Cooke (BBC inžinjer elektronike, tehnicki direktor Wharfedale-a) i poslovni saradnici, osnovali su kompaniju KEF Electronics Ltd., sa namerom da prave ino-vativne zvucnike koristeci najnovije mate-rijale i tehnologije. Osnovana je u Kentu 1961. godine, na imanju nekadašnje kompa-nije “Kent Inžinjerstva i Livnice (Kent Engineering and Foundary)” odakle je “KEF” i dobio ime.
Zahvaljujuci stalnom eksperimentisanju sa novim materijalima i tehnologijama KEF zvucnici su uvek imali fantasticna akusticna merenja i mogli su da reprodukuju snimke najbliže moguce originalnom zvuku u studiju ili nastupu uživo. Od pocetka, kao i danas, KEFova inovativnost i kvalitet su neosporni, tako da više od pola veka unazad audiofili širom sveta uživaju u ovim zvucnicima visokih perfomansi.
EF R400b Subwoofer
At just 31 inches square, the KEF R400b may be compact, yet it packs an incredible punch. With a reinforced and braced sealed cabinet, the R400b houses twin 9-inch LF drivers powered by twin 250W class-D amplifiers. The drivers are mounted back-to-back, to create ‘force cancelling’. This means the opposing reactive forces are nullified, resulting in no cabinet agitation and a clean, fast, powerful bass performance – perfect for any serious home theatre system.
|Design||Powered Subwoofer (Sealed)|
|Drive Units||Bass units:
LF: 2 x 225mm (9in.)
|Frequency range (-6dB)||26Hz - 140Hz|
|Amplifier||2 x 250W (500W)
|Low pass filter Variable||40Hz - 140Hz, 4th-order|
|Low level signal inputs||RCA phono sockets|
|Internal volume||22 litres|
|Power requirements||100V - 120V / 220V - 240V
~ 50 / 60Hz
|Dimension (H x W x D)
(with grille, terminal & plinth)
|365 x 330 x 351 mm
(14.4 x 13 x 13.8 in.)
Amazingly fast and clean mid-range response. Startlingly pure high frequencies. All operating as a single perfectly integrated voice to deliver sweet, accurate sounds of unprecedented clarity.
The new Uni-Q driver array is nothing short of a masterpiece.
Unlike conventional speakers, the mid-range cones are rigid magnesium/aluminum constructions that reduce breakup problems. The new mid-range Z-flex surround smoothes the tweeter transition to the front baffle, which results in undistorted high frequencies.
Large voice coils increase power handling and dynamics, reducing distortion and delivering exceptional vocal clarity.
Venting the tweeters reduces pressure behind the dome, increasing midrange bandwidth and lowering distortion. Upper registers are articulated with flawless precision. KEF’s tangerine waveguide helps disperse higher frequencies evenly across a wider angle to flood the room with a sophisticated, refreshingly natural sound field.
Dynamic, uncompressed and undistorted bass of heart pounding clarity envelops you, striking deep emotional chords. Your soul will awaken. And the earth will move.
Designed from the ground up, the R series is a towering leap forward that creates a new dimension
in sonic authenticity.
The geometry and bracing of the enclosure optimises vibrational behavior, reducing secondary radiation from cabinet walls for a cleaner sound. Damping panels further minimize cabinet resonance and colouration.
Front baffles are clean with no visible screws. Grilles are fixed magnetically. Available in real Walnut and Rosewood veneers, or highly polished Piano Black, the R Series complements the home as much as it
respects the music.
A little finesse goes a long way to delivering a big impact. Every aspect of the R Series has been considered in the creation of a superb audio experience.
Adjustable die cast aluminum feet support steel spikes, with integrated locking knobs for easy height adjustment. Nickel plated bi-wire connectors with terminal linking control allow all standard connection methods and provide easy, reliable connection.
The geometry of the reflex ports has been tuned to minimize turbulence at high levels, reducing port noise and low frequency compression.
The R Series presents the high-end technologies of KEF Blade in a timeless, elegant format. Serious
Piano black high gloss
Walnut real wood veneer
Rosewood real wood veneer