In this review, we will be comparing R3 Meta and LS50 Meta, two Passive Bookshelf speakers by KEF.
Let's have a brief look at the main features
of KEF R3 Meta and KEF LS50 Meta first before getting into our more
detailed comparison.
| Key Specs | KEF R3 Meta | KEF LS50 Meta |
|---|
| Brand | KEF
United Kingdom · founded 1961 | KEF
United Kingdom · founded 1961 |
|---|
| Design | 3-way | 2-way |
|---|
| Uni-Q driver | 12th Generation Uni-Q | 12th Generation Uni-Q |
|---|
| Tweeter | 1" Hard-Dome | 1" Hard-Dome |
|---|
| Midrange | 5" | — |
|---|
| Woofer | 6.5" Hybrid Aluminum | 5.25" Aluminum |
|---|
| Frequency response | 58-28k Hz | 79-28k Hz |
|---|
| Sensitivity | 87 dB | 85 dB |
|---|
| Impedance | 4 ohms | 8 ohms |
|---|
| Power range | 15-180 watts | 40-100 watts |
|---|
| Weight | 12.41kg / 27.3lbs | 7.82kg / 17.2lbs |
|---|
| Dimensions (H x W x D) | 16-5/8" x 7-15/16" x 13-1/4"
423.0 x 202.0 x 337.0mm | 11-15/16" x 7.875" x 11-1/16"
303.0 x 201.0 x 281.0mm |
|---|
What size room are the KEF R3 Meta and KEF LS50 Meta 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:
| Listening Environment* |
KEF R3 Meta |
KEF LS50 Meta |
| Near-field |
Poor |
Average |
| Small Room |
Poor |
Good |
| Mid-size Room |
Good |
Average |
| Large Room |
Good |
Poor |
| Very Large Room |
Average |
Bad |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2,
Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: >
400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual
listening experience changes depending on floor height, room shape, surface materials, listening
position, speaker locations, etc.)
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
Drivers
One of the fundamental differences between these two speakers is that R3 Meta is a 3-way design whereas the LS50 Meta is a 2-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.
KEF R3 MetaKEF LS50 Meta
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
KEF R3 Meta |
KEF LS50 Meta |
|
Driver Setup
|
3-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 5-inch |
- |
|
Woofer
|
1 x 6.5-inch
|
1 x 5.25-inch
|
R3 Meta features a 1" Aluminum with MAT absorber Hard-Dome Tweeter, a 5" Midrange and 1 x 6.5" Hybrid Aluminum Woofer with a Crossover frequency at 420Hz and 2300Hz. On the other hand, the LS50 Meta features a 1" Aluminum Hard-Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2100Hz.
Frequency Response
R3 Meta has a frequency range of 58-28k Hz whereas LS50 Meta has a frequency range of 79-28k Hz. With a minimum frequency of 58Hz, the R3 Meta can go significantly deeper on the low side and provide stronger bass compared to the LS50 Meta's min frequency of 79Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
R3 Meta is a 4 ohms speaker compared to the LS50 Meta which has a nominal impedance of 8 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 R3 Meta can provide this impedance level.
These two speakers also have different sensitivity levels. R3 Meta sensitivity is rated at 87 dB and the LS50 Meta's is rated at 85 dB. This 2 dB difference makes the KEF R3 Meta a more sensitive speaker compared to KEF LS50 Meta, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
R3 Meta can handle a max power of 180 watts RMS, whereas LS50 Meta has a max power handling value of 100 watts RMS, 80 watts less than the R3 Meta.
Note that higher power handling does not make a speaker louder: that depends mainly on
sensitivity and impedance. The calculator below shows how loud each of these actually plays
on a real amplifier.
Which plays louder on your amplifier?
Starting with a popular amplifier - change it to the one you own, or any you are
considering, and watch both numbers move.
Input Type and Bi-Amping / Bi-Wiring
R3 Meta features Custom 5-way bi-wire tool-less binding posts posts which make bi-amping or bi-wiring possible. LS50 Meta has a Post which doesn't feature bi-amping/bi-wiring.
KEF R3 Meta's Custom 5-way bi-wire tool-less binding posts terminals allows Bi-amping or bi-wiring
KEF LS50 Meta's Post terminals
Cabinet Type and Port Position
Both R3 Meta and LS50 Meta 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
The size of a speaker can sometimes be 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 R3 Meta's and KEF LS50 Meta's external dimensions. KEF R3 Meta has external dimensions of 423.0 x 202.0 x 337.0mm (16-5/8-inch x 7-15/16-inch x 13-1/4-inch) whereas 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).
KEF R3 Meta is clearly the larger of the two speakers. Its body is 1mm wider, 120mm taller and 56mm deeper than KEF LS50 Meta.
Below you can see the front view size comparison of KEF R3 Meta and KEF LS50 Meta in scale.
Comparison image of KEF R3 Meta and KEF LS50 Meta 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 R3 Meta is approximately 680.7cm2 / 105.5inch2 and base area of the KEF LS50 Meta is approximately 564.8cm2 / 87.5inch2. The R3 Meta requires 21% more surface area than the LS50 Meta which gives it a small disadvantage on placement in tight spaces.
Here is 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 R3 Meta and KEF LS50 Meta 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 R3 Meta weighs 12.41kg / 27.3lbs and the KEF LS50 Meta weighs 7.82kg / 17.2lbs. This makes the R3 Meta 59% heavier than the LS50 Meta.
Here is a comparison of how R3 Meta and LS50 Meta'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 R3 Meta?
Here are the items that are included inside the box of R3 Meta:
- 1 pair of R3 Meta loudspeakers
- 1 pair of microfiber grilles
- Rubber feet
- Port bungs
- User manual and warranty information
What's in the Box of KEF LS50 Meta?
Here are the items that come with the LS50 Meta:
- 2 Bookshelf loudspeakers
- 2 Foam port plugs
- 8 Self-adhesive rubber feet
- Owners Manual
- Warranty Registration Card
 Max Input Power |
180 watts
vs
100 watts
|
Handle more power from your amplifier |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Sensitivity |
87 dB
vs
85 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
6.5 inches
vs
5.25 inches
|
Larger woofer |
|
Low Frequency Response |
58 Hz
vs
79 Hz
|
Generates deeper bass |
 Bi-Amping and Bi-Wiring |
Yes
vs
No
|
Allows bi-amping and bi-wiring connections |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
 Minimum Impedance |
3.5 ohms
vs
3.2 ohms
|
Very low impedance levels puts more pressure on amplifier |
 Height |
303mm
vs
423mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
564cm2
vs
680cm2
|
Takes less floor space |
 Price per pair* |
1600USD
vs
2199USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF R3 Meta |
KEF LS50 Meta |
| Brand |
KEF |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
15-180 watts |
40-100 watts |
| Sensitivity |
87 dB |
85 dB |
| Impedance |
4 ohms |
8 ohms |
| Impedance |
3.2 ohms |
3.5 ohms |
| Frequency Response |
58-28k Hz |
79-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6.5" |
5.25" |
| Woofer Composition |
Hybrid Aluminum |
Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Hard-Dome |
Hard-Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
5" |
No |
| Crossover Frequency |
420Hz and 2300Hz |
2100Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
423.0mm (16.7") |
303.0mm (11.9") |
| Width |
202.0mm (8") |
201.0mm (7.9") |
| Depth |
337.0mm (13.3") |
281.0mm (11.1") |
| Weight |
12.41kg (27.3lbs) |
7.82kg (17.2lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
n/a |
MDF/Polymer |
| Available Colors |
Black Gloss, White Gloss, Walnut, Indigo Gloss Special Edition |
Carbon Black,Titanium Grey,Royal Blue,Mineral White |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
n/a |
25-30" |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
No |
Other |
|
|
| Parts Warranty |
5 years |
5 Years |
| Labor Warranty |
5 years |
5 Years |
Both are KEF, from different ranges - so the house sound is shared and the differences are mostly in scale, engineering and price.
| Area | Better | Why |
|---|
| Bass | A | KEF R3 Meta digs deeper - 58Hz against 79Hz. |
| Amplifier needs | A | KEF R3 Meta is more sensitive (87dB vs 85dB), so it goes louder on the same amplifier. |
| Amplifier match | B | KEF LS50 Meta is the easier load at 8 ohms; the other is 4 ohms and wants an amplifier rated for it. |
| Headroom | A | KEF R3 Meta takes more power (180W vs 100W) - more in hand in a big room. |
| Size | depends | KEF LS50 Meta is easier to place; KEF R3 Meta is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | depends | KEF R3 Meta: bi-amping. KEF LS50 Meta sits in a wider range (10 models), so a matched surround system is easier later. |
| Price | B | KEF LS50 Meta is cheaper - $1,600 against $2,199, about 27% less. |
A KEF R3 Meta B KEF LS50 Meta
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: KEF R3 Meta measures better, KEF LS50 Meta costs about about 37% more% less. Whether that gap is worth the money is the call only you can make - and in a normal room it is often smaller than the numbers suggest. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 79Hz anyway, which makes the cheaper KEF LS50 Meta much easier to justify. Match it to your room: we rate KEF R3 Meta the better fit for a mid-size room, a large room and a very large room, and KEF LS50 Meta for near-field listening and a small room.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.