KEF LSX is a 2-way Powered Bass Reflex Bookshelf speaker by KEF. LSX's built-in amplifier provides 200-watt RMS. The built-in power amplifier saves space & eliminates the need to connect KEF LSX 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 59-28k Hz. KEF LSX has an MSRP of 1250$ per pair.
KEF LSX Speaker Structure
KEF later replaced LSX with LSX II. Follow the link to read our in-depth comparison of these speakers:
Compare KEF LSX vs KEF LSX II
KEF's LS Series of Loudspeakers
LSX is a member of KEF's LS series of Powered speakers. Below you can see the main specs of these speakers.
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Frequency Response of the KEF LSX Speaker
KEF LSX has a Frequency response range of 59-28k Hz at ±3dB. With a minimum frequency of 59 Hz, LSX delivers moderate bass depth so depending on your use case, you might want to consider adding a subwoofer to your system.
To focus on the subwoofers that are in a similar price range with KEF LSX, 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'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
High Frequency
Bookshelf Speakers
KEF LSX Back View
Handheld Remote
KEF LSX comes with a handheld remote which is obviously very useful to control your powered speakers from a distance.
Bluetooth Connectivity
KEF LSX 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 can playback up to 24-bit / 96 kHz with compatible devices.
KEF LSX supports the following Bluetooth Codecs when used with supported devices:
Supported Streaming Services
KEF LSX supports the following Streaming Services:
Supported Wireless Streaming System
KEF LSX supports the following wireless streaming methods:
- AirPlay 2
- ROON
- Bluetooth 4.2
App-Based Control
KEF LSX can be controlled wirelessly via KEF Connect application available on Apple iOS and Android.
Inputs and Outputs
- 3.5mm Minijack Input
- USB Port: Charge only
- Wired Subwoofer Output
- Digital Input: Optical
- Ethernet Port
KEF LSX Connections
KEF LSX External Dimensions and Weight
KEF LSX has external dimensions of (Height x Width x Depth) 9.4375 x 6.125 x 7.1inch (239.7 x 155.6 x 180mm ).
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 is approximately 365.7cm2 / 56.7inch2.
To get a better perspective on the real life size of KEF LSX, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).
KEF LSX Speaker Size Compared to a Compact Disc
Here we place the KEF LSX 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 Speaker next to an amplifier and turntable
Weight The speaker with the built-in amplifier weighs 3.60kg / 7.9lbs whereas the other speaker weighs 3.50kg/ 7.7lbs. Here is a comparison of how LSX's weight compares with the average, max and min weights in its class.
Weight
All Bookshelf Speakers
Weight
Bookshelf Speakers under $1500
How does the KEF LSX compare to the KEF LSX?
One of the natural alternative to the KEF LSX is the LSX which is located one step higher in KEF's Powered Bookshelf selection.
Here is a scaled size comparison of these two speakers to give you an idea how their external dimensions compare:
Comparison image of KEF LSX and KEF LSX Size and External Dimensions
Check the Detailed Comparison of KEF LSX vs LSX for more details.
Cabinet type and Materials
KEF LSX 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.
Port Position
KEF LSX 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.
Available colors
KEF LSX is available in Black, Olive Green and Gloss White.
Wall Mounting
LSX 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 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 Speaker Stands for KEF LSX
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
Recommended Accessories
Here is a list of accessories that we think you may need for the KEF LSX.
- Vibration Isolators: IsoAcoustics isolators more affordable options too.
- Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
- Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.
User's Manual
For more information about how to setup, use and maintain the KEF LSX, use the direct link below to download the official manual document:
Download User Manual for KEF LSX
Official Brochure
Here is a link to download the official brochure for the KEF LSX speaker:
Official Brochure for KEF LSX
Official Product Page
Official manufacturer's product page for the KEF LSX speaker can be found below:
Official Product Page for KEF LSX
Warranty
1 Year of parts warranty and 1 Year of labor warranty is generally provided by the manufacturer.