Variety Of Sources
App & Remote Control
Uni-Q Driver Array: The LS50 powered speakers feature KEF's
patented Uni-Q driver configuration, in which the tweeter is mounted at the
acoustic center of the midrange cone. With both acting as a single point source,
the sound is dispersed widely and evenly throughout the listening area allowing
you to experience superbly defined and perfectly balanced stereo imagery with a
wide "sweet spot". The Uni-Q driver array is made up of a 1" aluminum
vented-dome tweeter and a 5.25" magnesium/aluminum alloy cone woofer.
- 1" Aluminum Vented-Dome Tweeter: The geometry of the tweeter dome
matches that of the midrange cone to avoid disrupting the waveform. By
smoothening high frequency response, this helps to account for the detailed
and strikingly natural-sounding treble. The 1" aluminum vented-dome tweeter
utilizes a Tangerine Waveguide to encourage the sound to radiate spherically
for wider, more even dispersion so that everyone in the room enjoys the same
superb sound quality. A large internal vent prevents potentially distorting
high pressures from building up behind the dome in the critical vocal
region, preserving all the nuance and fine detail of the original
- 5.25" Magnesium/Aluminum Alloy Woofer: The 5.25" woofer uses a
magnesium/aluminum alloy cone that is light, stiff, and smooth for natural
midrange and midbass sound. A well as allowing the midrange cone its full
extension, KEF's ingenious Z-flex surround guides the sound from the tweeter
across the surround without any disturbance or secondary radiation. Treble
response is clearer and sweeter.
Note: The LS50 powered speaker system does not include grilles.
Bi-Amplifier Configuration: The 1" aluminum vented-dome tweeter and
5.25" magnesium/aluminum alloy woofer are powered by an incredible clean and
fast 230 watt amplifier in a bi-amp dual mono configuration (200 watts to the
woofer and 30 watts to the tweeter) that produces high-fidelity sound.
Note: Because the LS50 Wireless speaker system is self-powered, each
speaker will need to be plugged into an AC wall outlet.
Advanced Time Correcting DSP: The LS50 Wireless employs an advanced
time correcting DSP crossover that corrects for inherent time delays introduced
in the crossover stage.
FEA-Designed Cabinet: The FEA-designed cabinet with its constrained
layer damping bracing and precision engineered curved baffle, along with the
elliptical flexible port all work in concert to prevent cabinet vibration and
resonances that produce unwanted sound coloration for clear, spacious,
- Curved Baffle: The curved baffle is shaped so that the sound
waves spread from the drivers with minimum reflection from the edges which
gives a very nice spacious sound. The curvature also improves the rigidity
of the baffle which reduces vibration and sound coloration.
- Constrained Layer Damping: The constrained layer damping which is
between the brace and the enclosure walls and also the front baffle,
prevents the cabinet from vibrating and radiating sound. This helps to
prevent coloration in the midrange.
- Flexible Port Tube: The rear-firing port tube has a flexible wall which
allows midrange sound that is travelling down the port tube to escape back
into the cabinet and prevents longitudinal resonances; which can otherwise
radiate and cause midrange coloration. The port tube also has very carefully
flared walls to avoid the chuffing noises that you can hear when you get air
turbulence inside the port.
24-Bit/192kHz DACs: The LS50 Wireless features an end-to-end
192kHz/24-bit high-resolution digital signal path with two separate DACs for
each speaker, for a total of four for the pair.
Speaker EQ: The LS50 Wireless speaker system provides a
built-in Speaker EQ to tailor the sound of the system to the placement of the
speaker. Select from "Desk", "Stand", "Wall", or "Free Space".
Advanced Audio Settings: Through the KEF LS50 Wireless app for
Apple iOS 8.0+ and
Android OS 4.1+ you get access to advanced audio settings to expertly
tailor the system's sound to your room environment and preference.
- Room Acoustics: You can select the size of your room (Small,
Medium, or Large), as well as indicate the room setting (Damped, Moderate,
or Lively). In addition, you can indicate how far the speakers are from the
- Bass & Treble: You adjust the treble trim from -2dB to +2dB. The
bass extension can be set to Less, Standard, or Extra. There is also phase
correction between the two speakers.
- Sub Controls: If you connect a powered subwoofer you can activate
a variable high pass (50-120Hz) & low pass (40-250Hz) crossover. You can
also adjust sub polarity and sub gain (-10 to +10dB), as well as the balance
between subwoofer and speaker.
Tethered Cable: The speakers are labeled "RIGHT" & "LEFT". The
included 10' Cat-6 cable plugs into the back of each speaker to connect them
together as a stereo pair. You can set the balance between the Right & Left
Subwoofer Output: The KEF LS50 Wireless speaker system is equipped
with a mono-RCA subwoofer output to connect a powered sub (sold separately).
Variety Of Sources
Wired or Wireless Network Connectivity: The KEF LS50 Wireless speaker system
can be connected to your home network via a wired (Ethernet) or wireless (WiFi)
connection. There is a RJ-45 Ethernet port (10/100Mbps) on the back of the speaker which
allows for a hardwired connection. Built-in 2.4/5GHz dual-band WiFi (802.11
a/b/g/n) allows the LS50 Wireless speaker system to connect wirelessly to your home
recommends streaming Hi-Res music files over a 5GHz WiFi network with a
router transmission speed of at least 1300Mbps
Online Music Services: With a wired or wireless network
connection, the LS50 Wireless speaker system provides access to Tidal and Spotify using
the KEF Stream app on your compatible Apple iOS or Android OS device.
TIDAL is a global streaming service that offers millions of songs in
high-fidelity CD sound quality. TIDAL has two pricing tiers; either $9.99 or
$19.99 a month. Both pricing levels allow you to access TIDAL's entire music
library. The $19.99 tier has the added benefit of high-fidelity sound at
- Spotify Connect: The integration of
Connect will enable
Spotify Premium users to instantly select and wirelessly stream music to
the LS50 Wireless speaker system from within the Spotify app (Apple
Android). Spotify is a digital music service that gives you on-demand
access to one of the largest music libraries in the world (over 15 million
tracks and counting). Spotify makes it easier than ever to discover, manage,
and share music with your friends. You can browse music by artist, album,
track, or most popular; and create your own music library with customized
DLNA Compliant: The LS50 Wireless is a DLNA Digital Media
Renderer and can play Hi-Res music files (up to 24-bit/192kHz) from other DLNA
servers and NAS (Network Attached Storage) devices. The following music files
can be streamed wireless via DLNA.
|File Format ||Sampling
Frequency ||Bit Rate or
Bit Depth |
|MP3 ||8-48 kHz ||16 bit |
|WMA ||8-48 kHz ||16 bit |
|AAC ||32-96 kHz ||16 bit |
|AIFF ||32-192 kHz ||16 / 24 bit |
|FLAC ||8-192 kHz ||16 / 24 bit |
|WAV ||8-48 kHz ||16 / 20 / 24 bits |
|PCM ||8-192 kHz ||16 / 20 / 24 bits |
Asynchronous USB-B Port: The LS50 Wireless speaker system is outfitted with
an Asynchronous USB-B port for playback of 2ch PCM music files (up to
24-bit/192kHz) from your Windows PC (7-up) or Mac computer (OSX 10.6-up). If you
are using a Windows PC, you will need to download a dedicated USB audio driver
from the KEF website.
Note: There is also a USB-A port, but this is for service and
software/firmware updates only. It cannot be used for music streaming.
Optical Digital Input: The LS50 Wireless speaker features an optical
(toslink) digital input with support for 2ch PCM audio (up to 24-bit/96kHz). The
Optical digital input does not support Dolby Digital, DTS, or other
Stereo RCA Input: The LS50 Wireless powered speaker offers an analog
stereo RCA output for connection of an analog audio source device. If you want
to connect a turntable, you will need a turntable with a built-in phono preamp
or an external phono preamp (sold separately).
Bluetooth 4.0: With its built-in Bluetooth (version 4.0),
you are able to wirelessly stream stored music and music apps from your
Bluetooth-enabled Apple iPod/iPhone/iPad, Android smartphone/tablet, Windows
Phone/PC, Mac computer/laptop and other Bluetooth source devices to the KEF LS50
speaker. You'll still need to control music playback and view song/artist info
from your Bluetooth source device.
- aptX: In addition to support the standard Bluetooth SBC
codec, the KEF LS50 offers support for aptX. With aptX, you can stream
CD-quality sound from aptX compatible devices (like Android OS 4.0+). Now
your wireless music sounds rich, full, and natural with less compression.
- SSP: With SSP (Simple Secure Pairing), Bluetooth source
devices can be paired with a single press of a button and without entering
PIN code. Up to 8 devices can be paired with the LS50 speakers and two
devices can remain connected, but only one device can be playing at a time.
Note: Due to the differences in Bluetooth technology, some
Bluetooth enabled devices may be incompatible, function improperly, or may
not support all features when used with the KEF LS50.
App & Remote Control
KEF Stream App: The KEF Stream App (for
Apple iOS 8.0+ and
Android OS 4.1+) provides full control of the LS50 Wireless speaker system using your
compatible smartphone or tablet. It provides initial setup for connection to
your WiFi network, as well as notifications of firmware updates as they become
available. You'll also get access to select online music services such as
Spotify & Tidal, as well as access to local music libraries stored on a Windows
PC or other DLNA media service. You can even stream music stored locally on your
Apple iOS or Android device to the LS50 Wireless speaker system from the app. In addition,
you get playback controls and song/artist info with album art on the KEF Stream
KEF Control App: The KEF Control App (for
Apple iOS 9.0+ and
Android OS 4.1+) provides comprehensive remote control functionalities for
LS50 Wireless speaker system, further enhancing the user experience. It can be used as a
stand-alone app or in combination with the above KEF Stream app. In addition to
source selection, playback & volume control, firmware updates; the app offers
advanced audio adjustments such as Speaker Sound Profiles, Volume Customization,
and Switching between Left/Right speakers. However, the KEF Control App does not
provide access to Tidal or Spotify.
Roon Remote (available firmware update): Thanks to an
available firmware update and the Roon Remote App (for
Apple iOS 11.0+ and
Android OS 4.4+), the LS50 Wireless speaker system can now use the
Roon music player software
to identify your personal music collection and simultaneously acts as a
searchable digital engine, providing in-depth information about that collection
such as album descriptions and artwork, artist photos and bios, critical
reviews, tour dates and lyrics. When coupled with an additional subscription to
TIDAL, Roon finds links between the your personal file and the millions of
tracks available from the streaming service, so that new music can be discovered
from the world beyond your own personal collection.
Top-Panel & Remote Control: The KEF LS50 Wireless features
top-panel touch-sensitive controls for Power, Source Selection, Bluetooth
Pairing, and Volume. The included IR remote provides wireless operation of the
same functions, plus Play/Pause, Previous/Next Track and Mute.