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Overview
The active LS50 Wireless II incorporates all the
technology described for the passive LS50 Meta, plus
a few extras that either add to the presentation of the
music - making it even more accurate - or add to the
functionality.
The electronics, mounted on the back, includes two
channels of power amplication (one channel for each
driver and each of higher power than the original LS50
Wireless) and the KEF Musical Integrity Engine (MIE).
This is essentially custom Digital Signal Processing
(DSP) that allows the acoustic engineer to do far more
than is possible in any passive design.
Each stereo pair comprises a Primary and a Secondary
speaker. The former incorporates adjustments
applicable to both speakers, such as bass extension,
room acoustic compensation, source selection and
placement/EQ.
Bass may be extended to lower frequencies than is
limited by the usual passive cabinet-size/sensitivity
trade-off, the balance may be adjusted for speaker
position and room acoustics and the all-pass delay
inherent in passive crossovers may be eliminated.
All adjustments are made using a smartphone app.
This is available for both iOS and Android devices and
is a free download either from the Apple App Store or
the Google Play Store as appropriate.
Inputs
All inputs are fed to the Primary speaker (gure 43).
The six choices available are:
1. eARC PCM at up to 192kHz/24 bit - HDMI (TV)
socket
2. S/PDIF at up to 96kHz/24 bit - TOSLINK Optical
socket
3. S/PDIF at up to 192kHz/24 bit - RCA Phono (coax)
socket
4. Analogue stereo - Aux 3.5mm stereo jack socket
5. Network - Wireless (2.4GHz or 5GHz) and Wired
(RJ-45 socket and CAT 6 cable) supporting up to
384kHz/24bit, DSD256, MQA
6. Bluetooth 4.2
Selection is made using the smartphone app, the
controls on the top of the Primary speaker or the
supplied remote control.
Connection between Primary
and Secondary
The two speakers may be connected together either
wirelessly or hard-wired.
LS50 Wireless II is pre-paired at the factory for easy
setup in wireless mode. The wireless transmission
is totally independent of the local Wi-Fi signal. The
miniscule delay (2.9ms) between the primary and
secondary speakers in this mode is automtically
accounted for, through an equal delay applied to the
primary speaker. Finally, the wireless connection
resamples all audio to 96kHz/24 bit.
The wired interspeaker connection uses CAT-6 cable,
plugged into the relevant sockets on the rear of the
speakers. Cable mode must also be enabled in the KEF
Connect app settings menu. In this mode, all audio
signals are resampled to 192kHz/24 bit.
Figure 43
Primary Speaker Inputs
Streaming support
Wireless streaming supports the following:
AirPlay 2
Google Chromecast
ROON Ready (via future rmware update)
UPnP compatible
Bluetooth 4.2
The following music streaming services are also
supported (dependent on territory):
Spotify (via Spotify Connect)
Tidal
Qobuz
Deezer
Amazon Music
QQ Music via QPlay
Internet Radio
Podcast
Figure 44 - Block diagram of Primary Electronics
Figure 45 - Block diagram of Secondary Electronics
Figure 46 - DSP Details
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