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KEF LSX II vs KEF LS50 Wireless II
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KEF LSX II

Powered Bookshelf | 49-47k Hz

KEF LSX II
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KEF LS50 Wireless II

Powered Bookshelf | 45-28k Hz

KEF LS50 Wireless II
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KEF LSX II vs KEF LS50 Wireless II Speaker Comparison

In this review, we will be comparing LSX II and LS50 Wireless II, two Powered Bookshelf speakers by KEF Being Powered speakers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features of KEF LSX II and KEF LS50 Wireless II first before getting into our more detailed comparison.

KEF LSX II Key Specs

  • 2-way Design
  • 200-watt RMS Integrated Amplifier
  • 11th Generation Uni-Q Driver
  • 0.75" Hard-Dome Tweeter
  • 4.5" Magnesium/Aluminium alloy Woofer
  • 49-47k Hz Frequency Response
  • 24-bit Max Depth / 384 kHz Max Sample Rate
  • Built-in 4.2 Bluetooth
  • App Control Feature
  • Weight:3.60kg
  • Dimensions (H x W x D): 240.0" x 6.1" x 7.1"( 240 × 155 × 180 mm )

KEF LS50 Wireless II Key Specs

  • 2-way Design
  • 380-watt RMS( 760-watt Peak) Integrated Amplifier
  • 12th Generation Uni-Q Driver
  • 1" Hard-Dome Tweeter
  • 5.25" Aluminum Woofer
  • 45-28k Hz Frequency Response
  • 32-bit Max Depth / 384 kHz Max Sample Rate
  • Built-in 4.2 Bluetooth
  • App Control Feature
  • Weight:10.00kg
  • Dimensions (H x W x D): 277.8" x 7.875" x 12.6875"( 277.8 x 200.0 x 322.3mm )

LSX II and LS50 Wireless II are members of KEF's LS series of speakers. Below you can find the loudspeakers from this series.

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

In the following sections, we will get into more detail in order to better understand how the KEF LSX II and KEF LS50 Wireless II compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.


**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.



Drivers

Both LSX II and LS50 Wireless II are 2-way speakers. LSX II features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer . On the other hand, the LS50 Wireless II features a 1" Aluminum Hard-Dome Tweeter and 1 x 5.25" Aluminum Woofer .

Frequency Response

LSX II has a frequency range of 49-47k Hz whereas LS50 Wireless II has a frequency range of 45-28k Hz. With a minimum frequency of 49Hz, the LSX II can go slightly deeper then the LS50 Wireless II's min frequency of 45Hz.

Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Bookshelf class in our database.

Low Frequency

Bookshelf Speakers

LSX II
LS50 Wireless II
Min
Average
Max
High Frequency

Bookshelf Speakers

KEF LSX II
KEF LS50 Wireless II
Min
Average
Max

None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.

Cabinet Type and Port Position

Both LSX II and LS50 Wireless II have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.

KEF LSX II  Port
KEF LSX II Port

Physical Specs

Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare KEF LSX II's and KEF LS50 Wireless II's external dimensions. KEF LSX II has external dimensions of 240 × 155 × 180 mm ( 9.5 × 6.1 × 7.1 inch) whereas KEF LS50 Wireless II has external dimensions of 277.8 x 200.0 x 322.3mm ( 10.9375 x 7.875 x 12.6875inch) .

KEF LS50 Wireless II is clearly the larger of the two speakers. Its body is 45mm wider, 37.8mm taller and 142.3mm deeper than KEF LSX II.

Below you can see the front view size comparison of KEF LSX II and KEF LS50 Wireless II in scale.

KEF LSX II vs KEF LS50 Wireless II Size Comparison - Front View
Comparison image of KEF LSX II and KEF LS50 Wireless II Size and External Dimensions

Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base surface area of the KEF LSX II is approximately 279.0cm2 / 43.2inch2 and base area of the KEF LS50 Wireless II is approximately 644.6cm2 / 99.9inch2. The LSX II requires 57% less surface area than the LS50 Wireless II which gives it a small advantage on placement in tight spaces.

Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:

KEF LSX II vs KEF LS50 Wireless II Size Comparison on a Media Console
Size Comparison image of KEF LSX II and KEF LS50 Wireless II on a Media Console
Weight Comparison

The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The KEF LSX II weighs 3.60kg / 7.9lbs and the KEF LS50 Wireless II weighs 10.00kg / 22lbs. This makes the LS50 Wireless II 178% heavier than the LSX II.

Here is a comparison of how LSX II and LS50 Wireless II's weights compare with the average, max and min weights in Powered Bookshelf class.

Weight
All Bookshelf Speakers
KEF LSX II
KEF LS50 Wireless II
Min
Average
Max

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
  • What's in the Box of KEF LS50 Wireless II?

    Here are the items that come with the LS50 Wireless 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

  • Reasons to choose KEF LSX II over KEF LS50 Wireless II
    High Frequency Response 47k Hz vs 28k Hz Generates higher frequency
    Height 240mm vs 277mm Easier to fit in smaller spaces
    Base Surface Area 279cm2 (155x180mm) vs 644cm2 (200x322mm) Takes less floor space
    Price per pair* 1399USD vs 2800USD costs less (*prices may change depending on the seller, location and time)
    Reasons to choose KEF LS50 Wireless II over KEF LSX II
    Uni-Q Driver 12th Generation vs 11th Generation Newer generation Driver
    Woofer Size 5.25 inches vs 4.5 inches Larger woofer
    Low Frequency Response 45 Hz vs 49 Hz Generates deeper bass


    KEF LSX II vs KEF LS50 Wireless II Specs Table
    Detailed comparison of specifications
    General KEF LSX II KEF LS50 Wireless II
    Brand KEF KEF
    Speaker Type Powered Stereo Speakers Powered Stereo Speakers
    Frequency Response 49-47k Hz 45-28k Hz
    Amplifier
    Watts RMS (Continuous) 200-watt RMS 380-watt RMS
    Watts Peak (Max) n/a 760-watt RMS
    Max Bit Depth 24-bit 32-bit
    Max Sample Rate 384 kHz 384 kHz
    Drivers
    Woofer Quantity 1 1
    Woofer Size 4.5" 5.25"
    Woofer Composition Magnesium/Aluminium alloy Aluminum
    Woofer Surround Material Rubber Rubber
    Tweeter Size 0.75" 1"
    Tweeter Type Hard-Dome Hard-Dome
    Aimable Tweeter No No
    Midrange Driver No No
    Firing Direction rear rear
    Physical Specs
    Height 240.0mm (9.4") 277.8mm (10.9")
    Width 155.0mm (6.1") 200.0mm (7.9")
    Depth 180.0mm (7.1") 322.3mm (12.7")
    Weight 3.60kg (7.9lbs) 10.00kg (22lbs)
    Enclosure Bass Reflex Bass Reflex
    Available Colors Carbon Black, Mineral White, Cobalt Blue, Lava Red, and Soundwave n/a
    Mounting Bracket No No
    Moisture Resistancy No No
    Connections
    Aux Inputs 3.5mm 3.5mm
    USB Port USB-C (connects to your computer) Service only
    Phone Input No No
    Subwoofer Output Wired Wired
    Digital Input Optical Optical, Coax
    HDMI Input eARC eARC
    Headphone Jack No No
    Ethernet Port Yes Yes
    Other
    Parts Warranty 1 Year 1 Year
    Labor Warranty 1 Year 1 Year

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