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KEF LSX II Review
KEF LSX II

Main Features

  • 11th Generation Uni-Q Driver
  • 0.75" Hard-Dome Tweeter
  • 4.5" Magnesium/Aluminium alloy Woofer
  • 49-47k Hz Frequency Response
  • 200-watt RMS Integrated Amplifier
  • 24-bit Max Depth / 384 kHz Max Sample Rate
  • Built-in 4.2 Bluetooth
  • Weight:7.80 lbs / 3.60 kg
  • Dimensions(HxWxD): 9.5"x6.1"x7.1" / 240 × 155 × 180 mm
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KEF LSX II Review

KEF LSX II is a 2-way Powered Bass Reflex Bookshelf speaker by KEF. LSX II's built-in amplifier provides 200-watt RMS. The built-in power amplifier saves space & eliminates the need to connect KEF LSX II to a stereo receiver or external power amp. It features a 0.75" Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer. The speaker has a frequency range of 49-47k Hz. KEF LSX II has an MSRP of 1399$ per pair.

KEF replaced the older LSX with this model. Follow the link to read our detailed comparison of these models:
Compare KEF LSX II vs KEF LSX

What are the speakers in KEF's LS Series?

LSX II is a member of KEF's LS series of Powered speakers. Below you can see the main specs of these speakers.

KEF LS Series Speakers
Model Frequency Watts RMSMax Depth / Sample Rate Woofer
KEF LS60 Wireless
Compare
31-24k Hz 1400-watt24-bit/384 kHzΩ 4 x 5.25"
KEF LSX II
49-47k Hz 200-watt24-bit/384 kHzΩ 1 x 4.5"
KEF LS50 Wireless II
Compare
45-28k Hz 380-watt32-bit/384 kHzΩ 1 x 5.25"
KEF LS50 Wireless
Compare
79-28k Hz 230-watt24-bit/192 kHzΩ 1 x 5.25"
KEF LSX
Compare
59-28k Hz 200-watt24-bit/96 kHzΩ 1 x 4.5"


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

What is the Frequency Response of the KEF LSX II speaker?

KEF LSX II has a Frequency response range of 49-47k Hz. At a minimum frequency of 49 Hz, LSX II will provide an average bass depth so depending on your use case, you may consider supplementing your system with a subwoofer.

To focus on the subwoofers that are in a similar price range with KEF LSX II, check out the Powered Subwoofers under $1500. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how LSX II's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Bookshelf Speakers
KEF LSX II
Min
Average
Max
High Frequency
Bookshelf Speakers
KEF LSX II
Min
Average
Max


KEF LSX II Back View
KEF LSX II Back View

Handheld Remote

KEF LSX II comes with a handheld remote which is obviously very useful to control your powered speakers from a distance.

Bluetooth Connectivity

KEF LSX II employs Built-in 4.2 Bluetooth for wireless music streaming from your Bluetooth-enabled devices such as Apple iPod/iPhone/iPad, Android smartphone/tablet, Windows PC, Mac computers/laptops. LSX II can playback up to 24-bit / 384 kHz with compatible devices.

KEF LSX II supports the following Bluetooth Codecs when used with supported devices:

  • aptX
  • AAC
  • SBC

Supported Streaming Services

KEF LSX II supports the following Streaming Services:

  • Spotify via Spotify Connect
  • Tidal
  • Amazon Music
  • Qobuz
  • Deezer
  • QQ Music via QPlay
  • Internet Radio
  • Podcast

Supported Wireless Streaming System

KEF LSX II supports the following wireless streaming methods:

  • AirPlay 2
  • Google Chromecast
  • ROON Ready
  • UPnP Compatible
  • Bluetooth 4.2

App-Based Control

KEF LSX II can be controlled wirelessly via KEF Connect application available on Apple iOS and Android.

KEF Connect Wireless Control App
KEF Connect Wireless Control App

Inputs and Outputs

  • 3.5mm Minijack Input
  • USB Port: USB-C (connects to your computer)
  • Wired Subwoofer Output
  • Digital Input: Optical
  • HDMI Input: eARC
  • Ethernet Port

KEF LSX II Connections
KEF LSX II Connections

KEF LSX II External Dimensions and Weight

KEF LSX II has external dimensions of (Height x Width x Depth) 9.5 × 6.1 × 7.1 inch (240 × 155 × 180 mm ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of KEF LSX II is approximately 279.0cm2 / 43.2inch2.

To get a better perspective on the real life size of KEF LSX II, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).

KEF LSX II Real Life Body Size Comparison
KEF LSX II Speaker Size Compared to a Compact Disc

Here we place the KEF LSX II virtually next to a standard width amplifier and turntable on a BDI Octave Media Cabinet to get a better idea about the size.

KEF LSX II placed next to an amplifier and turntable
KEF LSX II Speaker next to an amplifier and turntable

Weight

The KEF LSX II weighs 3.60kg / 7.9lbs per piece. Here is a comparison of how LSX II's weight compares with the average, max and min weights in its class.

Weight
All Bookshelf Speakers
KEF LSX II
Min
Average
Max
Weight
Bookshelf Speakers under $1500
KEF LSX II
Min
Average
Max

Cabinet type and Materials

KEF LSX II has a Bass Reflex type cabinet. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.

Speaker Feet

KEF LSX II comes with Optional floor spikes which you can use to secure your loudspeaker on the surface that you are putting on.

It is always recommended to use some kind of feet under all types of speakers. Besides limiting the movement of the speakers, it also compensates for non-flat surfaces and limits the contact surface area of the speaker. Rubber based feet also help isolating the vibrations within certain frequency ranges.

Port Position

KEF LSX II is a rear-firing port speaker so you have to make sure you leave enough space between the back of the speaker and wall or bookshelf so that it has room to breathe.

KEF LSX II  Port
KEF LSX II Port

Available colors

KEF LSX II is available in Carbon Black, Mineral White, Cobalt Blue, Lava Red and and Soundwave.

KEF LSX II  Colors
KEF LSX II Colors

Wall Mounting

LSX II doesn't sport any built-in mounting bracket, so you need an external structure to mount it on walls.

Speaker Stands

KEF sells a dedicated speaker stand for the LSX II with a model name KEF S1. You can check the latest price and availability of these stands at B&H PHOTO and Amazon.

KEF S1 for KEF LSX II
KEF S1 Speaker Stands for KEF LSX II

What's in the Box of KEF LSX II?

Here are the items that are included inside the box of LSX II:
  • 2 Wireless powered speakers
  • Two 6.5-feet AC power cords
  • 10-feet Cat-6 interconnect speaker cable
  • Remote control
  • 2 AAA batteries
  • Quick Start Guide
  • Important Safety Information
  • Warranty Information
  • Maintenance Guide
  • User's Manual

    For more information about how to setup, use and maintain the KEF LSX II, use the direct link below to download the official manual document:
    Download User Manual for KEF LSX II

    Official Brochure

    Here is a link to download the official brochure for the KEF LSX II speaker:
    Official Brochure for KEF LSX II

    Official Product Page

    Official manufacturer's product page for the KEF LSX II speaker can be found below:
    Official Product Page for KEF LSX II

    Warranty

    1 Year of parts warranty and 1 Year of labor warranty is generally provided by the manufacturer.

    KEF LSX II  Lifestyle
    KEF LSX II Lifestyle

    KEF LSX II Alternatives in Powered Bookshelf Speakers
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    2-way 160w Built-in 5.0 50-25k Hz
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    Frequently Asked Questions about KEF LSX II
    What is the External Dimensions of KEF LSX II



    KEF LSX II Detailed Specifications

    General
    BrandKEF
    Full Model NameKEF LSX II
    Speaker Type2-way Bookshelf
    Max SPL102 dB
    Frequency Response49-47k Hz
    Amplifier Specs
    Watts RMS200 watts
    TypeClass D
    DAC Specs
    Max Digital Audio Bit Depth24-bit
    Max Digital Audio Sample Rate384 kHz
    DRIVERS
    Woofer Size4.5-inch
    Woofer CompositionMagnesium/Aluminium alloy
    Woofer SurroundRubber
    Tweeter Size0.75-inch
    Tweeter TypeHard-Dome
    Port Positionrear
    DIGITAL ECOSYSTEM
    Control by AppApple iOS, Android
    App NameKEF Connect
    Amazon AlexaNo
    Google AssistantNo
    Streaming ServicesSpotify via Spotify Connect
    Tidal
    Amazon Music
    Qobuz
    Deezer
    QQ Music via QPlay
    Internet Radio
    Podcast
    Wireless StreamAirPlay 2
    Google Chromecast
    ROON Ready
    UPnP Compatible
    Bluetooth 4.2
    Multi-room StreamingYes
    Subwoofer OutputWired

    CONNECTIONS
    Ethernet PortYes
    USB PortUSB-C (connects to your computer)
    Aux Input3.5mm
    Phono InputNo
    Digital InputOptical
    HDMI InputeARC
    Headphone JackNo
    BluetoothBuilt-in 4.2
    Bluetooth CodecaptX, AAC, SBC
    Wi-Fi802.11n
    Wi-Fi Bands802.11n
    Wi-Fi Bands2.4, 5 GHz
    Port Positionrear
    PHYSICAL SPECS
    Height240.0mm ( 9.5-inch)
    Width155.0mm ( 6.1-inch)
    Depth180.0mm ( 7.1-inch)
    Height240.0mm ( 9.5-inch)
    Weight3.60kg ( 7.80 lbs)
    EnclosureBass Reflex
    Available ColorsCarbon Black, Mineral White, Cobalt Blue, Lava Red, and Soundwave
    Mounting BracketNo
    Moisture ResistanceNo
    OTHER
    Handheld RemoteYes
    Parts Warranty1 Year
    Labor Warranty1 Year
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