In this review, we will be comparing LSX and LSX II LT, 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 LSX II LT first before getting into our more
detailed comparison.
LSX and LSX II LT 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 LSX II LT 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 LSX II LT are 2-way speakers.
| Driver |
KEF LSX |
KEF LSX II LT |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
0.75-inch
|
0.75-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4.5-inch
|
1 x 4.5-inch
|
LSX features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer . On the other hand, the LSX II LT features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer .
Frequency Response
LSX has a frequency range of 59-28k Hz whereas LSX II LT has a frequency range of 54-28k Hz. With a minimum frequency of 54Hz, the LSX II LT 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 LSX II LT 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 LSX II LT'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 LSX II LT has external dimensions of 240 × 155 × 180 mm ( 9.5 × 6.1 × 7.1 inch) .
Below you can see the front view size comparison of KEF LSX and KEF LSX II LT in scale.
Comparison image of KEF LSX and KEF LSX II LT 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 LSX II LT is approximately 279.0cm2 / 43.2inch2. The LSX requires 31% more surface area than the LSX II LT which gives it a small disadvantage 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 LSX II LT 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 LSX II LT weighs 3.60kg / 7.9lbs. This makes the LSX II LT 3% heavier than the LSX.
Here is a comparison of how LSX and LSX II LT'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 LSX II LT?
Here are the items that come with the LSX II LT:
2 Wireless powered speakers6.5-feet AC power cords3m - 10ft Interspeaker cableRemote control2 AAA batteries Quick Start Guide Important Safety Information Warranty Information Maintenance Guide
 Height |
239mm
vs
240mm
|
Easier to fit in smaller spaces |
 3.5mm Connection |
Yes
vs
No
|
Connection via 3.5mm AUX input |
 Low Frequency Response |
54 Hz
vs
59 Hz
|
Generates deeper bass |
 Base Surface Area |
279cm2 (155x180mm)
vs
365cm2 (155x180mm)
|
Takes less floor space |
 Price per pair* |
999USD
vs
1250USD
|
costs less (*prices may change depending on the seller, location and time) |
 HDMI Input |
ARC
vs
No
|
Connect HDMI sources directly |
| General |
KEF LSX |
KEF LSX II LT |
| Brand |
KEF |
KEF |
| Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
| Frequency Response |
59-28k Hz |
54-28k Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
200-watt RMS |
| Max Bit Depth |
24-bit |
24-bit |
| Max Sample Rate |
96 kHz |
384 kHz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
4.5" |
4.5" |
| Woofer Composition |
Magnesium/Aluminium alloy |
Magnesium/Aluminium alloy |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
0.75" |
0.75" |
| 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") |
240.0mm (9.4") |
| Width |
155.6mm (6.1") |
155.0mm (6.1") |
| Depth |
180.0mm (7.1") |
180.0mm (7.1") |
| Weight |
3.50kg (7.7lbs) |
3.60kg (7.9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Available Colors |
Black, Olive Green, Gloss White |
Sage Green, Graphite Grey, Stone White |
| Mounting Bracket |
No |
No |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Aux Inputs |
3.5mm |
n/a |
| USB Port |
Charge only |
USB-C (connects to your computer) |
| Phone Input |
No |
No |
| Subwoofer Output |
Wired |
Wired |
| Digital Input |
Optical |
Optical |
| HDMI Input |
No |
ARC |
| Headphone Jack |
No |
No |
| Ethernet Port |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
1 Year |
1 Year |
| Labor Warranty |
1 Year |
1 Year |