An innovative concept inspired by the legendary LS3/5a, LS50 mini monitor speaker is designed to bring professional studio monitor concept into the home.

Rarely the case in such a compact design, the LS50 monitor delivers a rich, multi-dimensional ‘soundstage experience’ that is out of all proportion to its size. Patent-pending acoustic designs, together with state-of-the-art technologies from KEF’s latest flagship Blade loudspeaker, provide the ultimate studio experience – even in the smallest of spaces.

Creating a small housing capable of delivering such a spacious sound is the result of considerable research and development. In cabinet construction, baffle shaping and port design, LS50 breaks new ground with patent-pending technology. All this is made possible by KEF’s leadership in modern research (including techniques such as Finite Element Analysis and Computational Fluid Dynamics*). LS50’s unique technology offers by far the cleanest, most accurate studio-grade performance of any mini monitor.

LS50 employs revolutionary technology developed for Blade, KEF’s latest flagship loudspeaker. Using the very latest Uni-Q driver, specifically designed for this model, LS50 radiates an extremely large listening sweet spot and delivers a remarkably fast, clean sound. And, because LS50 neither adds nor subtracts a single sound, it’s effortlessly natural and accurate too.

Model LS50
Design Two-way bass reflex
Drive units Uni-Q driver array:
HF: 25mm (1in.) vented
aluminium dome
LF/MF: 130mm (5.25in.)
magnesium/aluminium alloy
Frequency range (-6dB) 47Hz – 45kHz
Frequency response (±3dB) 79Hz – 28kHz
Crossover frequency 2.2kHz
Amplifier requirements 25 – 100 W
Sensitivity (2.83V/1m) 85dB
Harmonic distortion
2nd & 3rd harmonics (90dB, 1m)
<0.4% 175Hz-20kHz
Maximum output 106dB
Nominal impedance 8Ω (min. 3.2Ω)
Weight 7.2kg (15.8lbs.)
Dimension (H x W x D)
(with terminal)
302 x 200 x 278 mm
(11.9 x 7.9 x 10.9 in.)

This is a really great little speaker, and truth be told I was smitten with the design even before I heard it. The LS50’s swept-back, curved baffle, with a single rose gold Uni-Q KEF driver gives the speaker a fresh new look. The LS50 is KEF’s 50th Anniversary Commemorative Model, and it’s very much a twenty first century speaker. http://www.innerfidelity.comkefls

Before we go any further let’s get a few specs out of the way, the LS50 stands 11.9 inches tall, it’s 7.9″ wide and 10.9″ deep. The speaker weighs 15.8 pounds, and the internally braced MDF cabinet feels extremely solid and inert. The –3dB down point for the low end is 79 Hertz, but the LS50 sounds more full range than that number would indicate. Unless you crave pants flapping bass there’s no need to add a sub.

The curved baffle was designed to provide a low diffraction environment for the Uni-Q’s ribbed 5.25 inch aluminum/magnesium woofer with a 1 inch aluminum dome tweeter coaxially mounted in the center of the driver. It sports a die-cast aluminum frame, and the tweeter has that nifty looking Tangerine waveguide that uses «radial air channels to produce spherical waves up to the highest frequencies.» The LS50 is an 8 Ohm speaker, but drops down to 3.2 Ohms, and sensitivity is pretty low, just 85dB with 2.83V at 1 meter. The rear panel hosts an elliptical port, and KEF supplies a set of foam plugs to stuff in the ports if the speakers need to be placed in close proximity of walls. Heavy-duty binding posts match the quality feel of the rest of the speaker. There are no provisions for wall mounts or brackets, but this isn’t really the sort of speaker that sounds best hugging a wall. The MSRP runs $1499.99 per pair.