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Model: E305W
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  • Datasheet

KEF 5.1 Home Theatre Speakers with 4.25" Uni-Q Driver Array. Uni-Q tweeter and MF/LF driver. 8" subwoofer. Egg system with accurate 3D sound. Colour White

A perfectly balanced, seamlessly integrated high end 5.1 sub/sat system based on KEF's new 4.25" Uni-Q driver array and a superlative matching subwoofer, the new E305 home theatre system outperforms the competition by filling the room with a spacious, exquisitely detailed and compellingly natural soundscape that captures all the magic of the original performance.

New 4.25inch Uni-Q driver array

The secret of the E305 system's outstanding hi-fi response lies in the latest iteration of KEF's signature Uni-Q driver array, originally developed for the multiple award-winning Q Series. With its famously wide dispersion characteristics and sonic purity, this technology is what gives the system its extraordinarily natural sound quality.


Uni-Q Tweeter

The tweeter at the centre of the midrange cone is vented to prevent distortion-inducing high pressure from building up behind the dome, so the response in the critical vocal region remains intricately detailed with every nuance of the original recording. With KEF's 'Tangerine' waveguide, it encourages the sound to radiate evenly, increasing both the dispersion and sensitivity of the tweeter for a more natural performance throughout the listening area.


Uni-Q MF/LF driver

Being stiffer than conventional materials, the aluminium midrange cone operates rigidly over the entire vocal range for the smooth, clear midrange response that reproduces the human voice with stunning accuracy. KEF’s Z-flex surrounding cone provides a smooth, uninterrupted surface over which the tweeter’s output passes with no disturbance or diffraction. It's undercut magnet designed driver motor, which usually is only found in high-end speakers, reduces midrange distortion by generating a very symmetrical magnetic field, resulting transparency helps to create the feeling of 'being there'.



It takes more than a great driver to create a class-leading satellite speaker, and the E301 satellite was designed from the start as a single perfectly balanced system with the crossover, cabinet and drivers working together in harmony.

The less there is to intermediate the recorded signal, the clearer the sound. To eliminate secondary radiation and cabinet coloration, the enclosures are heavily reinforced with internal ribbing and damping technologies to ensure sonic accuracy with no unwanted resonances. The low diffraction cabinets are carefully engineered to minimise scattering of the output, so nothing subtracts from, no adds to, the sound from the driver.



The E305 system is designed to deliver exceptional bass performance, with the sub seamlessly integrated within the rest of the system, so it sounds like five full-range loudspeakers. The frequency and phase response of the sub and satellites are carefully matched to smoothen the transition, so you can't hear where the satellite stops and the sub starts.

With a large, powerful motor system driving a long throw 8-inch cone, low-frequency reproduction remains composed and unerringly accurate, even at high volume. Based on a Linkwitz Transform circuit to minimise any signal group-delay that would otherwise muddy the bass, the onboard pre-amp assures noticeably cleaner and more accurate low-frequency reproduction.

A closed-box design, the E-2 subwoofer delivers agile extended bass response without overhang - fast, punchy and well defined. Like the satellites, the cabinet borrows damping technologies from the LS50 to avoid resonance and secondary radiation to ensure tight, clean and immaculately controlled bass.


 MODEL E301 E301C
 Design  Two-way bass reflex  Two-way bass reflex 
 Drive units 

Uni-Q driver array:

HF: 19mm (0.75in.) vented aluminium dome

MF/LF: 115mm (4.25in.) aluminium 

Uni-Q driver array:

HF: 19mm (0.75in.) vented aluminium dome

MF/LF: 115mm (4.25in.) aluminium

 Frequency range (-6dB) 80Hz~45kHz  80Hz~45kHz
 Frequency response (±3dB) 90Hz~3kHz   90Hz~33kHz  
 Crossover frequency  2.7kHz  2.7kHz 
 Amplifier requirements 10W~100W 10W~100W
 Sensitivity (2.83Y/ 1m)  86dB  86dB 
 Harmonic distortion
2nd & 3rd harmonics (90dB, 1m)
 <1% 100Hz~40kHz   <1% 100Hz~40kHz 
Maximum output (SPL) 109dB  109dB 
Norminal impedance  80Ω (min. 3.4Ω)  80Ω (min. 3.4Ω)
Internal volume  1.5 Litres  1.5 Litres 
Weight  2.4kg (5.3lbs.)  2.4kg (5.3lbs.) 
Dimensions (H x W x D)
(with grille and base)
260 x 136 x 159mm
(10.2 x 5.4 x 6.3in.)
157 x 220 x 155mm
(6.2 x 8.7 x 6.1in.)
Finishes  Deep black/Pure white Deep black/Pure white
Optional accessory  Floorstand N/A
Design  Powered Subwoofer
LF Drive unit 200mm (8in.) 
Frequency range (-6dB) 33Hz~280Hz
Amplifier  250W built-in Class-D
Maximum output (SPL) 102dB 
Low pass filter variable Fixed 250Hz, 2nd-order
Low-level signal inputs RCA phono socket
Enclosure type Sealed 
Internal volume 14.7 Litres 
Power requirements 100V~240V AC. 50/60Hz 
Power consumption 250VA 
Weight  7.25kg (16lbs.) 
Dimensions (HxWxD)  320 x 430 x 270mm
(12.6 x 16.9 x 10.6in.)
Finishes Deep black / Pure white