
QAcoustics -...
The all new, Q 3050i floorstanding speaker has been created using design principles taken from our critically acclaimed Concept 500 Series, resulting in stunning sonic performance and beautiful aesthetics.
Flagship of the new R Series range
The largest model in the R Series the R11 combines four bass drivers and the latest generation Uni-Q for a powerful and refined sound.
Developed by KEF in 1988, the Uni-Q driver array acts as a single point source, providing pristine sound across a wider area. The R Series benefits from a new incarnation of this driver array, with advantages over its predecessors that include a new midrange motor system that drastically reduces distortion.
Air moving across the minute gaps between Uni-Q’s separate elements creates tiny resonances, but KEF engineers have reduced the impact of these necessary gaps by opening a cavity behind the drivers and adding resonance-absorbing damping material for more precise, purer treble.
Shadow Flare of KEF R11
Derived from the Reference Series, the Shadow Flare reduces harmful cabinet diffraction and allows the Uni-Q to work at its highest level.
More than just a trim ring, Shadow flare is a precision-designed surface that extends the waveguide effect of Uni-Q. The tweeter no longer has line of sight of the cabinet edges, creating a ‘shadow region’ at the points where the potential for diffraction is highest, minimising the acoustic impact to negligible levels.
The result is improved clarity, particularly when it comes to the subtle nuances of plucked strings and percussive sounds.
Low Frequency Drivers of KEF R11
The R Series’ dedicated low-frequency drivers have a two-part structure, where a shallow concave aluminium skin sits atop a paper cone. This adds stiffness, while the cone’s unique geometry reduces resonances and delivers the pistonic movement that makes these drivers time so well. Air moving across the minute gaps between Uni-Q’s separate elements creates tiny resonances, but KEF engineers have reduced the impact of these necessary gaps by opening a cavity behind the drivers and adding resonance-absorbing damping material for more precise, purer treble.
The new drivers also have a completely redesigned magnet system that creates a more even magnetic field, and a design of spider that reduces harmonic distortion for a cleaner, more precise sound.
Cabinet Bracing
The R Series benefits from Constrained Layer Damping bracing originally developed for the multiple award-winning LS50, and a new internal bracing layout. This combination brings the R Series closer to the internal structure of the Reference Series, and helps it deliver music as it is supposed to sound, without any unwanted extras.
Flexible Port Technology
KEF engineers computer-modeled the ideal crossover networks before exhaustively auditioning every high grade component, individually and together, to select those with the lowest distortion and the smoothest response. Perfectionism takes time, but the difference is plain to hear. Nothing is overlooked – Reference crossovers are even mounted on separate boards and decoupled from the cabinet walls to minimize vibration and crosstalk. The R Series benefits from Constrained Layer Damping bracing originally developed for the multiple award-winning LS50, and a new internal bracing layout. This combination brings the R Series closer to the internal structure of the Reference Series and helps it deliver music as it is supposed to sound, without any unwanted extras.
Model |
R11 |
Design |
Three-way bass reflex |
Drive Units |
Uni-Q Driver Array: |
Crossover frequency |
400Hz, 2.9kHz |
Frequency range (-6dB) |
30Hz – 50kHz |
Frequency response (±3dB) |
46Hz – 28kHz |
Harmonic distortion (90dB, 1m) |
<0.3% 0.3% 120Hz – 20kHz |
Maximum output |
113dB |
Amplifier power (recommended) |
15 – 300W |
Nominal Impedance |
8 Ohms (min.3.2?) |
Sensitivity (2.83V/1m) |
90dB |
Weight * |
37.7 kg (83.1 lbs.) |
Dimension (H x W x D) |
1249 x 200 x 383.5 mm |
Dimension (H x W x D) |
1295.5 x 310.6 x 383.5 mm |
Finishes |
Black Gloss / White Gloss / Walnut |
The all new, Q 3050i floorstanding speaker has been created using design principles taken from our critically acclaimed Concept 500 Series, resulting in stunning sonic performance and beautiful aesthetics.
The Q950 — KEF's Q Series flagship speaker — combines a striking grille-less design with exceptional musical performance to fill even large rooms with excellent sound.
The speaker's 8" Uni-Q driver is joined by a separate 8" woofer dedicated to reproducing low frequencies. These two woofers team up with a pair of 8" passive radiators to deliver accurate, punchy bass with your favorite albums, movies, sports broadcasts, and video game soundtracks.
KEF BLADE is the top model in the range with four 225mm/9in. bass drivers and a Uni-Q MF/HF array in a 1590mm/62.5in. high cabinet.
KEF BLADE is the world’s first Single Apparent Source loudspeaker and the production version of the cost no object Concept Blade project KEF revealed at the Munich High End Show in 2009.
The slender floorstanding Monitor 200 speakers reveal every aspect of a performance. Their sleek lines and orange drivers make them a stylish addition to any room.
The slim Monitor 200s are the smallest floorstander in the range and are designed to deliver a stunning sound in small to medium-sized rooms. They have all the precision of a two-way speaker, with the addition of an extra bass driver for scale and power.