KEF LS50 Wireless II Speakers - Moss Green

The KEF LS50 Wireless II is much more than an update to the original LS50 Wireless; it is a fully active wireless stereo system built on the same Metamaterial Absorption Technology (MAT) as the LS50 Meta. This technology uses a labyrinth of channels to absorb 99% of unwanted high‑frequency energy from the back of the tweeter, delivering pure, natural treble. Combined with KEF’s 12th‑generation Uni‑Q driver array, it offers incredibly precise, three‑dimensional sound with a broad, evenly dispersed sweet spot.

Designed around a new platform, the LS50 Wireless II integrates powerful amplifiers—280 W Class D for the mid‑bass driver and 100 W Class A/B for the tweeter—controlled by the Music Integrity Engine DSP for perfectly timed, controlled sound. Its new wireless architecture supports AirPlay 2, Google Chromecast, Roon Ready streaming and Bluetooth 4.2, while built‑in services let you access Spotify, Tidal, Amazon Music, Qobuz and more. With HDMI eARC, optical and coaxial digital inputs, analog auxiliary, Ethernet and RCA subwoofer output, it connects to everything from TVs to turntables.

Key Features:

• Metamaterial Absorption & Uni‑Q Driver: MAT technology absorbs 99% of unwanted high‑frequency sound from the rear of the tweeter, while the 12th‑generation Uni‑Q driver acts as a point source, delivering a detailed, immersive soundstage with reduced distortion.
• Powerful Built‑in Amplification: Each speaker houses its own amplifiers: 280 W of Class D power driving the aluminium mid‑bass cone and a 100 W Class A/B amplifier powering the vented aluminium dome tweeter, providing room‑filling dynamics with minimal distortion.
• Music Integrity Engine DSP: KEF’s bespoke Music Integrity Engine optimises the time alignment and frequency response of the drivers, ensuring tight, coherent bass, precise imaging and a seamless transition between the tweeter and mid‑bass driver.
• High‑Resolution Streaming & Services: Stream music up to 24‑bit/384 kHz over your network, enjoy MQA and DSD playback and listen via AirPlay 2, Chromecast, Roon Ready, UPnP, Bluetooth 4.2 and built‑in services such as Spotify Connect, Tidal, Amazon Music, Qobuz and Deezer.
• Comprehensive Connectivity: Inputs include HDMI eARC, TOSLINK optical, digital coaxial, 3.5 mm analog auxiliary, RJ45 Ethernet for network and interspeaker connection, plus subwoofer output. Interspeaker connection can be wireless (96 kHz/24‑bit) or wired (192 kHz/24‑bit).
• Premium Design & Finish: A curved, low‑diffraction cabinet with eye‑catching heat sinks and colour‑matched rear ports reduces cabinet resonance and diffraction. Available in Carbon Black, Mineral White, Moss Green or Sandshell, with threaded inserts to secure the speakers to KEF S2 stands.

Product Specifications:

• Model: LS50 Wireless II
• Drive units: Uni‑Q Driver Array: LF 130 mm (5.25 in.) aluminium cone; HF 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption Technology
• Frequency range (‑6 dB): 40 Hz – 47 kHz (measured at 85 dB/1 m, depends on EQ settings)
• Frequency response (±3 dB): 45 Hz – 28 kHz (measured at 85 dB/1 m, depends on EQ settings)
• Amplifier output (per speaker): LF 280 W Class D; HF 100 W Class A/B
• Maximum SPL: 108 dB (measured at 1 m)
• Streaming platforms: AirPlay 2, Google Chromecast, Roon Ready, UPnP, Bluetooth 4.2, Spotify Connect, Tidal, Amazon Music, Qobuz, Deezer, QQ Music via QPlay, Internet radio and podcasts
• Source resolution: Network up to 384 kHz/24 bit; optical up to 96 kHz/24 bit; coaxial up to 192 kHz/24 bit; HDMI up to 192 kHz/24 bit
• Interspeaker connection: Wireless: all sources resampled to 96 kHz/24 bit PCM; Wired: all sources resampled to 192 kHz/24 bit PCM
• Supported formats: MP3, M4A, AAC, FLAC, WAV, AIFF, ALAC, WMA, LPCM, Ogg Vorbis; network: MQA, DSD64, DSD128, DSD256 via DSF and DFF
• Dimensions (H × W × D per speaker): 305 × 200 × 311 mm (12.0 × 7.9 × 12.2 in)
• Weight (per set): 20.1 kg (44.3 lb)
• Power input: 100 – 240 VAC 50/60 Hz
• Power consumption: 200 W operating; <2.0 W standby
• Inputs: HDMI eARC, TOSLINK optical, digital coaxial, 3.5 mm analog auxiliary, USB Type A (service), RJ45 Ethernet (network and interspeaker)
• Outputs: RCA subwoofer output
• Network standard: IEEE 802.11a/b/g/n/ac (2.4 GHz/5 GHz), IPv4/IPv6

FAQs:

How does Metamaterial Absorption Technology improve the LS50 Wireless II?

MAT uses a complex maze‑like absorber to remove 99 % of unwanted high‑frequency energy radiated from the back of the tweeter, significantly reducing distortion and delivering a purer, more natural treble response.

What makes the LS50 Wireless II different from the passive LS50 Meta?

While the LS50 Meta is a passive bookshelf speaker, the LS50 Wireless II is a fully active system with built‑in amplification, digital signal processing and wireless streaming capabilities. It combines MAT and the 12th‑generation Uni‑Q driver with a high‑resolution streaming platform and powerful amplifiers to create an all‑in‑one hi‑fi solution.

What streaming services can I use with LS50 Wireless II?

The speakers support AirPlay 2, Google Chromecast, Roon Ready and Bluetooth 4.2, and provide direct access to Spotify via Spotify Connect, Tidal, Amazon Music, Qobuz, Deezer, QQ Music (via QPlay), Internet radio and podcasts.

How powerful are the built‑in amplifiers?

Each speaker contains a 280‑watt Class D amplifier for the aluminium mid‑bass driver and a 100‑watt Class A/B amplifier for the vented aluminium dome tweeter, delivering dynamic sound with a maximum SPL of 108 dB.

What sources and formats are supported?

The LS50 Wireless II plays audio up to 24‑bit/384 kHz via the network, supports optical, coaxial and HDMI inputs up to 192 kHz/24 bit, and can decode MP3, AAC, FLAC, WAV, AIFF, ALAC, WMA, LPCM, as well as MQA and DSD streams.

Which inputs and outputs are available?

Connectivity options include HDMI eARC, TOSLINK optical, digital coaxial, 3.5 mm analog auxiliary, two RJ45 Ethernet ports for network and interspeaker links, and RCA subwoofer output for adding a subwoofer.

What finishes and design features does it offer?

A curved, low‑diffraction cabinet with sculpted heat sinks houses the drivers. The speakers are available in Carbon Black, Mineral White, Moss Green or Sandshell and each cabinet has threaded inserts for securing KEF S2 stands.

Can the LS50 Wireless II be used in a multi-room setup?

Yes. With AirPlay 2, Google Chromecast and Roon Ready support, you can stream music to multiple LS50 Wireless II speakers throughout your home, creating a seamless multi‑room listening experience.

KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair Downloads:

KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair - User Manual
KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair - Quick Start Guide
KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair - Information Sheet
KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair - Specifications
KEF LS50 Wireless II Bookshelf Speakers - Moss Green Pair - White Paper