In this review, we will be comparing LS50 Meta and Uni-Fi UB5, two Passive Bookshelf speakers from KEF and ELAC. Let's have a brief look at the main features
of KEF LS50 Meta and ELAC Uni-Fi UB5 first before getting into our more
detailed comparison.
What size room are the KEF LS50 Meta and ELAC Uni-Fi UB5 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision factor. Here we have compared their suitability to various sizes of environments considering their size and max power parameters:
In the following sections, we will get into more detail in order to better understand how the KEF LS50 Meta and ELAC Uni-Fi UB5 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
One of the fundamental differences between these two speakers is that LS50 Meta is a 2-way design whereas the Uni-Fi UB5 is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
KEF LS50 Meta |
ELAC Uni-Fi UB5 |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
1 x 4-inch |
|
Woofer
|
1 x 5.25-inch
|
1 x 5.25-inch
|
LS50 Meta features a 1" Aluminum Hard-Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2100Hz. On the other hand, the Uni-Fi UB5 features a 1" Soft-dome Tweeter , a 4" Midrange and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 270Hz and 2700Hz.
Frequency Response
LS50 Meta has a frequency range of 79-28k Hz whereas Uni-Fi UB5 has a frequency range of 46-25k Hz. With a minimum frequency of 46Hz, the Uni-Fi UB5 can go significantly deeper on the low side and provide stronger bass compared to the LS50 Meta's min frequency of 79Hz.
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.
Impedance and Sensitivity
LS50 Meta is a 8 ohms speaker compared to the Uni-Fi UB5 which has a nominal impedance of 4 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the Uni-Fi UB5 can provide this impedance level.
On the other hand, they have the same sensitivity of 85 dBdB.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using an amplifier within this range ensures the nominal performance , inputting a power that is higher than the max wattage can result in a damaged speaker.
LS50 Meta can handle a max power of 140 watts RMS from the amp the whereas LS50 Meta has a max power handling value of 100 watts RMS , 40 watts less than the Uni-Fi UB5.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
LS50 Meta features Post type posts and Uni-Fi UB5 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
KEF LS50 Meta's Post terminals
ELAC Uni-Fi UB5's Post terminals
Cabinet Type and Port Position
Both LS50 Meta and Uni-Fi UB5 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 LS50 Meta's and ELAC Uni-Fi UB5's external dimensions. KEF LS50 Meta has external dimensions of 303.0 x 201.0 x 281.0mm ( 11-15/16 x 7.875 x 11-1/16inch) whereas ELAC Uni-Fi UB5 has external dimensions of 324.0 x 200.0 x 273.0mm ( 12.7 x 7.8 x 10.7inch) .
ELAC Uni-Fi UB5 is 1mm narrower and 8mm less deeper than KEF LS50 Meta but it is also 21mm taller.
Below you can see the front view size comparison of KEF LS50 Meta and ELAC Uni-Fi UB5 in scale.
Comparison image of KEF LS50 Meta and ELAC Uni-Fi UB5 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 LS50 Meta is approximately 564.8cm2 / 87.5inch2 and base area of the ELAC Uni-Fi UB5 is approximately 546.0cm2 / 84.6inch2. The LS50 Meta requires 3% more surface area than the Uni-Fi UB5 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 LS50 Meta and ELAC Uni-Fi UB5 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 LS50 Meta weighs 7.82kg / 17.2lbs and the ELAC Uni-Fi UB5 weighs 7.48kg / 16.5lbs. This makes the LS50 Meta 5% heavier than the Uni-Fi UB5.
Here is a comparison of how LS50 Meta and Uni-Fi UB5's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of KEF LS50 Meta?
Here are the items that are included inside the box of LS50 Meta:
2 Bookshelf loudspeakers2 Foam port plugs8 Self-adhesive rubber feetOwners ManualWarranty Registration Card
What's in the Box of ELAC Uni-Fi UB5?
Here are the items that come with the Uni-Fi UB5:
2 Bookshelf loudspeakers 2 Grilles Operating Instructions
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
 High Frequency Response |
28k Hz
vs
25k Hz
|
Generates higher frequency |
 Height |
303mm
vs
324mm
|
Easier to fit in smaller spaces |
 Max Input Power |
140 watts
vs
100 watts
|
Handle more power from your amplifier |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Low Frequency Response |
46 Hz
vs
79 Hz
|
Generates deeper bass |
 Base Surface Area |
546cm2 (200x273mm)
vs
564cm2 (201x281mm)
|
Takes less floor space |
| General |
KEF LS50 Meta |
ELAC Uni-Fi UB5 |
| Brand |
KEF |
ELAC |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
40-100 watts |
40-140 watts |
| Sensitivity |
85 dB |
85 dB |
| Impedance |
8 ohms |
4 ohms |
| Impedance |
3.5 ohms |
n/a |
| Frequency Response |
79-28k Hz |
46-25k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.25" |
5.25" |
| Woofer Composition |
Aluminum |
Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Hard-Dome |
Soft-dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
4" |
| Crossover Frequency |
2100Hz |
270Hz and 2700Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
303.0mm (11.9") |
324.0mm (12.8") |
| Width |
201.0mm (7.9") |
200.0mm (7.9") |
| Depth |
281.0mm (11.1") |
273.0mm (10.7") |
| Weight |
7.82kg (17.2lbs) |
7.48kg (16.5lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Polymer |
MDF/Vinyl |
| Available Colors |
Carbon Black,Titanium Grey,Royal Blue,Mineral White |
Black |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
25-30" |
24-31" |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
5 Years |
3 Years |
| Labor Warranty |
5 Years |
3 Years |