The largest model in the R Series combines four bass drivers and the latest generation Uni-Q for a powerful and refined sound

With hybrid aluminium bass drivers and a 12th generation Uni-Q for mid and treble the mighty R11is extremely capable. Using technology from KEF Reference it delivers clarity, finesse and serious bass. Design
Three-way bass reflex
Driver Units
Uni-Q Driver Array:
HF: 25mm (1in.) vented aluminium dome
MF: 125mm (5in.) aluminium cone
Bass Driver:
LF: 4x 165mm (6.5in.) hybrid aluminium
Weight
37.7 kg (83.1 lbs.)
Dimension (HxWxD)
1249 x 200 x 383.5 mm (49.2 x 7.9 x 15.1 in.) with terminal*
Dimension (HxWxD)
1295.5 x 310.6 x 383.5 mm (51 x 12.2 x 15.1 in.) with terminal with Plinth*
Sensitivity
(2.83V/1m) 90dB
Crossover Frequencies
400Hz, 2.9kHz
Frequency Range
30Hz-50kHz (-6dB)
Typical In-Room Bass Response
26Hz (-6dB)
Frequency Response
46Hz-28kHz (±3dB)
Harmonic Distortion
<0.3% 120Hz-20kHz (90dB, 1m)
Maximum Output
113dB
Amplifier Power
15-300W (recommended)
Nominal Impedance
8Ohms (min.3.2Ohms)
Finishes
Black Gloss / White Gloss / Walnut
Downloads
R Series User Manual
R Series Information Sheet
R Series White Paper
R Series Brochure
Maintenance Guide for R Series Microfibre Grille