In this review, we will be comparing Sonus faber Duetto and LS50 Wireless II, two Powered Bookshelf speakers from Sonus Faber 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 Sonus faber Duetto and KEF LS50 Wireless II first before getting into our more
detailed comparison.
Sonus faber Duetto Key Specs
- 2-way Design
- 700-watt RMS Integrated Amplifier
- 1.1" Soft-Dome Tweeter
- 5.25" Paper-Pulp Woofer
- 37-30k Hz Frequency Response
- 24-bit Max Depth / 192 kHz Max Sample Rate
- Built-in 5.0 Bluetooth
- App Control Feature
- Dimensions (H x W x D): 342.0" x 8.3125" x 11.0625"( 342.0 x 212.0 x 281.0mm )
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 )
In the following sections, we will get into more detail in order to better understand how the Sonus faber Duetto 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 Sonus faber Duetto and LS50 Wireless II are 2-way speakers.
| Driver |
Sonus faber Duetto |
KEF LS50 Wireless II |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1.1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
1 x 5.25-inch
|
Sonus faber Duetto features a 1.1" Silk Soft-Dome Tweeter and 1 x 5.25" Paper-Pulp 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
Sonus faber Duetto has a frequency range of 37-30k Hz whereas LS50 Wireless II has a frequency range of 45-28k Hz. With a minimum frequency of 37Hz, the Sonus faber Duetto can go significantly deeper on the low side and provide stronger bass compared to 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
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 Sonus faber Duetto 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.
Sonus faber Duetto 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 Sonus faber Duetto's and KEF LS50 Wireless II's external dimensions. Sonus faber Duetto has external dimensions of 342.0 x 212.0 x 281.0mm ( 13.4375inch x 8.3125inch x 11.0625inch ) 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 12mm narrower and 64.2mm shorter than Sonus faber Duetto but it is also 41.3mm deeper.
Below you can see the front view size comparison of Sonus faber Duetto and KEF LS50 Wireless II in scale.
Comparison image of Sonus faber Duetto 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 Sonus faber Duetto is approximately 595.7cm2 / 92.3inch2 and base area of the KEF LS50 Wireless II is approximately 644.6cm2 / 99.9inch2. The Sonus faber Duetto requires 8% 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 Sonus faber Duetto and KEF LS50 Wireless II on a Media Console
What's in the Box of Sonus faber Duetto?
Here are the items that are included inside the box of Sonus faber Duetto:
2 Wireless powered speakers2 GrillesTwo 6.5-feet AC power cordsRemote controlQuick Start GuideSafety Instructions
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
Low Frequency Response 
High Frequency Response 
Base Surface Area 
RCA Connection 
Height 
Price per pair* 
3.5mm Connection