In this review, we will be comparing Genelec G Three and LSX II, two Powered Bookshelf speakers from Genelec and 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 Genelec G Three and KEF LSX II first before getting into our more
detailed comparison.
Genelec G Three Key Specs
- 2-way Design
- 100-watt RMS Integrated Amplifier
- 0.75" Dome Tweeter
- 5.1" Cone Woofer
- 54-20k Hz Frequency Response
- N/A Max Depth / N/A Max Sample Rate
- Weight:5.00kg
- Dimensions (H x W x D): 299.0" x 7.4" x 7"( 299 x 189 x 178 mm )
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
- 54-28k Hz Frequency Response
- 24-bit Max Depth / 384 kHz Max Sample Rate
- App Control Feature
- Weight:3.60kg
- Dimensions (H x W x D): 240.0" x 6.1" x 7.1"( 240 × 155 × 180 mm )
In the following sections, we will get into more detail in order to better understand how the Genelec G Three and KEF LSX 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 Genelec G Three and LSX II are 2-way speakers.
| Driver |
Genelec G Three |
KEF LSX II |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
0.75-inch
|
0.75-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.1-inch
|
1 x 4.5-inch
|
Genelec G Three features a 0.75" Dome Tweeter and 1 x 5.1" Cone Woofer with a Crossover frequency at 3000Hz. On the other hand, the LSX II features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4.5" Magnesium/Aluminium alloy Woofer .
Frequency Response
Genelec G Three has a frequency range of 54-20k Hz whereas LSX II has a frequency range of 54-28k Hz.
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 Genelec G Three and LSX 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.
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 Genelec G Three's and KEF LSX II's external dimensions. Genelec G Three has external dimensions of 299 x 189 x 178 mm ( 11.8 x 7.4 x 7) whereas KEF LSX II has external dimensions of 240 × 155 × 180 mm ( 9.5 × 6.1 × 7.1 inch) .
KEF LSX II is 34mm narrower and 59mm shorter than Genelec G Three but it is also 2mm deeper.
Below you can see the front view size comparison of Genelec G Three and KEF LSX II in scale.
Comparison image of Genelec G Three and KEF LSX 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 Genelec G Three is approximately 336.4cm2 / 52.1inch2 and base area of the KEF LSX II is approximately 279.0cm2 / 43.2inch2. The Genelec G Three requires 21% more surface area than the LSX II 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 Genelec G Three and KEF LSX 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 Genelec G Three weighs 5.00kg / 11lbs and the KEF LSX II weighs 3.60kg / 7.9lbs. This makes the Genelec G Three 39% heavier than the LSX II.
Here is a comparison of how Genelec G Three and LSX 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 Genelec G Three?
Here are the items that are included inside the box of Genelec G Three:
Genelec G Three 2-Way Powered Bookshelf Speaker (Polar White, Single)Iso-Pod Stand5.9-feet Power Cable
What's in the Box of KEF LSX II?
Here are the items that come with the LSX 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 Maintenance Guide
 Woofer Size |
5.1 inches
vs
4.5 inches
|
Larger woofer |
 RCA Connection |
Yes
vs
No
|
Connection via RCA input |
 XLR Connection |
Yes
vs
No
|
Connection via XLR input |
 High Frequency Response |
28k Hz
vs
20k Hz
|
Generates higher frequency |
 Handheld Remote |
Yes
vs
No
|
Control the speaker by the included RC |
 App-Based Control |
Apple iOS, Android
vs
None
|
Control the speaker via an app |
 Height |
240mm
vs
299mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
279cm2
vs
336cm2
|
Takes less floor space |
 Price per pair* |
1299USD
vs
1390USD
|
costs less (*prices may change depending on the seller, location and time) |
 Ethernet Connection |
Yes
vs
No
|
High quality streaming over Ethernet |
 USB Port |
USB-C (connects to your computer)
vs
No
|
USB port adds flexibility |
 3.5mm Connection |
Yes
vs
No
|
Connection via 3.5mm AUX input |
 Digital Input |
Optical
vs
No
|
Connect digital inputs directly |
 HDMI Input |
ARC
vs
No
|
Connect HDMI sources directly |
| General |
Genelec G Three |
KEF LSX II |
| Brand |
Genelec |
KEF |
| Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
| Frequency Response |
54-20k Hz |
54-28k Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
100-watt RMS |
200-watt RMS |
| Max Bit Depth |
N/A |
24-bit |
| Max Sample Rate |
N/A |
384 kHz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.1" |
4.5" |
| Woofer Composition |
Cone |
Magnesium/Aluminium alloy |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
0.75" |
0.75" |
| Tweeter Type |
Dome |
Hard-Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
3000Hz |
n/a |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
299.0mm (11.8") |
240.0mm (9.4") |
| Width |
189.0mm (7.4") |
155.0mm (6.1") |
| Depth |
178.0mm (7") |
180.0mm (7.1") |
| Weight |
5.00kg (11lbs) |
3.60kg (7.9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Aluminum |
n/a |
| Available Colors |
White,Black,Raw(Aluminum) |
Carbon Black, Mineral White, Cobalt Blue, Lava Red, and Soundwave |
| Mounting Bracket |
No |
No |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Aux Inputs |
RCA,XLR |
3.5mm |
| USB Port |
No |
USB-C (connects to your computer) |
| Phone Input |
No |
No |
| Subwoofer Output |
n/a |
Wired |
| Digital Input |
No |
Optical |
| HDMI Input |
No |
ARC |
| Headphone Jack |
No |
No |
| Ethernet Port |
No |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
1 Year |
| Labor Warranty |
5 Years |
1 Year |