In this review, we will be comparing LSX 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 and KEF LS50 Wireless II first before getting into our more
detailed comparison.
KEF LSX Key Specs
- 2-way Design
- 200-watt RMS Integrated Amplifier
- 0.75" Hard-Dome Tweeter
- 4.5" Magnesium/Aluminium alloy Woofer
- 59-28k Hz Frequency Response
- 24-bit Max Depth / 96 kHz Max Sample Rate
- Built-in 4.2 Bluetooth
- App Control Feature
- Weight:3.50kg
- Dimensions (H x W x D): 239.7" x 6.125" x 7.1"( 239.7 x 155.6 x 180mm )
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 and LS50 Wireless II are members of KEF's LS series of speakers. Below you can find the loudspeakers from this series.
In the following sections, we will get into more detail in order to better understand how the KEF LSX 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.
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Drivers
Both LSX and LS50 Wireless II are 2-way speakers.
| Driver |
KEF LSX |
KEF LS50 Wireless II |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
0.75-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4.5-inch
|
1 x 5.25-inch
|
LSX 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 has a frequency range of 59-28k Hz whereas LS50 Wireless II has a frequency range of 45-28k Hz. With a minimum frequency of 45Hz, the LS50 Wireless II can go significantly deeper on the low side and provide stronger bass compared to the LSX's min frequency of 59Hz.
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
High Frequency
Bookshelf Speakers
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 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.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
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's and KEF LS50 Wireless II's external dimensions. KEF LSX has external dimensions of 239.7 x 155.6 x 180mm ( 9.4375 x 6.125 x 7.1inch) 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 44.4mm wider, 38.1mm taller and 142.3mm deeper than KEF LSX.
Below you can see the front view size comparison of KEF LSX and KEF LS50 Wireless II in scale.
Comparison image of KEF LSX 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 is approximately 365.7cm2 / 56.7inch2 and base area of the KEF LS50 Wireless II is approximately 644.6cm2 / 99.9inch2. The LSX requires 43% 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:
Size Comparison image of KEF LSX 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 weighs 3.50kg / 7.7lbs and the KEF LS50 Wireless II weighs 10.00kg / 22lbs. This makes the LS50 Wireless II 186% heavier than the LSX.
Here is a comparison of how LSX and LS50 Wireless II's weights compare with the average, max and min weights in Powered Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of KEF LSX?
Here are the items that are included inside the box of LSX:
2 Powered wireless audio speakerTwo 6.5-feet AC power cords10-feet Ethernet cableRemote control (CR2032 3V battery pre-installed)Maintenance GuideSpecificationsWarranty InformationImportant Safety Information
What's in the Box of KEF LS50 Wireless II?
Here are the items that come with the LS50 Wireless II:
2 Wireless powered speakersTwo 6.5-feet AC power cords10-feet Cat-6 interconnect speaker cableRemote control2 AAA batteries Quick Start Guide Important Safety Information Warranty Information
 Height |
239mm
vs
277mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
365cm2
vs
644cm2
|
Takes less floor space |
 Price per pair* |
1250USD
vs
2499USD
|
costs less (*prices may change depending on the seller, location and time) |
 Woofer Size |
5.25 inches
vs
4.5 inches
|
Larger woofer |
|
Low Frequency Response |
45 Hz
vs
59 Hz
|
Generates deeper bass |
 HDMI Input |
eARC
vs
No
|
Connect HDMI sources directly |
| General |
KEF LSX |
KEF LS50 Wireless II |
| Brand |
KEF |
KEF |
| Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
| Frequency Response |
59-28k 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 |
96 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 |
239.7mm (9.4") |
277.8mm (10.9") |
| Width |
155.6mm (6.1") |
200.0mm (7.9") |
| Depth |
180.0mm (7.1") |
322.3mm (12.7") |
| Weight |
3.50kg (7.7lbs) |
10.00kg (22lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Available Colors |
Black, Olive Green, Gloss White |
n/a |
| Mounting Bracket |
No |
No |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Aux Inputs |
3.5mm |
3.5mm |
| USB Port |
Charge only |
Service only |
| Phone Input |
No |
No |
| Subwoofer Output |
Wired |
Wired |
| Digital Input |
Optical |
Optical, Coax |
| HDMI Input |
No |
eARC |
| Headphone Jack |
No |
No |
| Ethernet Port |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
1 Year |
1 Year |
| Labor Warranty |
1 Year |
1 Year |