In this review, we will be comparing two different types of speakers by KEF. KEF R11 is a Floor-standing speaker whereas the R2c is a Center Channel speaker.
Let's have a brief look at the main features
of KEF R11 and KEF R2c first before getting into our more
detailed comparison.
| Key Specs | KEF R11 | KEF R2c |
|---|
| Design | 3-way | 3-way |
|---|
| Uni-Q driver | 12th Generation Uni-Q | 12th Generation Uni-Q |
|---|
| Tweeter | 1" Dome | 1" Dome |
|---|
| Midrange | 5" | 5" |
|---|
| Woofer | 4 x 6.5" Hybrid Aluminum | 2 x 5.25" Hybrid Aluminum |
|---|
| Frequency response | 46-28k Hz | 74-28k Hz |
|---|
| Sensitivity | 90 dB | 87 dB |
|---|
| Impedance | 8 ohms | 8 ohms |
|---|
| Power range | 15-300 watts | 15-200 watts |
|---|
| Weight | 37.70kg / 82.9lbs | 16.90kg / 37.2lbs |
|---|
| Dimensions (H x W x D) | 51-3/16" x 12-1/4" x 15-5/16"
1301.0 x 312.0 x 389.0mm | 6-15/16" x 21-11/16" x 12-7/16"
177.0 x 551.0 x 316.0mm |
|---|
R11 and R2c are members of KEF's R series of speakers. Below you can find the loudspeakers from this series.
What size room are the KEF R11 and KEF R2c 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 R11 |
KEF R2c |
| Near-field |
Bad |
Poor |
| Small Room |
Poor |
Average |
| Mid-size Room |
Average |
Good |
| Large Room |
Good |
Average |
| Very Large Room |
Average |
Poor |
(* 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.
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Drivers
Both R11 and R2c are 3-way speakers.
KEF R11KEF R2c
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 R11 |
KEF R2c |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 5-inch |
1 x 5-inch |
|
Woofer
|
4 x 6.5-inch
|
2 x 5.25-inch
|
R11 features a 1" aluminum Dome Tweeter, a 5" Midrange and 4 x 6.5" Hybrid Aluminum Woofer with a Crossover frequency at 400Hz and 2900Hz. On the other hand, the R2c features a 1" aluminum Dome Tweeter, a 5" Midrange and 2 x 5.25" Hybrid Aluminum Woofer with a Crossover frequency at 400Hz and 2900Hz.
Frequency Response
R11 has a frequency range of 46-28k Hz whereas R2c has a frequency range of 74-28k Hz. With a minimum frequency of 46Hz, the R11 can go significantly deeper on the low side and provide stronger bass compared to the R2c's min frequency of 74Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Floor-standing class in our database.
Low Frequency
Floor-standing 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
R11 and R2c have the same Impedance of 8 ohms but where they differ is the sensitivity levels. R11 sensitivity is rated at 90 dB and the R2c's is at 87 dB. This 3 dB difference makes the KEF R11 a more sensitive speaker compared to KEF R2c, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing 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.
R11 can handle a max power of 300 watts RMS, whereas R2c has a max power handling value of 200 watts RMS, 100 watts less than the R11.
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
Both R11 and R2c features dual binding post speaker terminals for bi-amping or bi-wiring.
KEF R11's Binding post terminals allows Bi-amping or bi-wiring
KEF R2c's Binding post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both R11 and R2c 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 R11's and KEF R2c's external dimensions. KEF R11 has external dimensions of 1301.0 x 312.0 x 389.0mm (51-3/16 x 12-1/4 x 15-5/16inch) whereas KEF R2c has external dimensions of 177.0 x 551.0 x 316.0mm (6-15/16 x 21-11/16 x 12-7/16inch).
KEF R2c is 1124mm shorter and 73mm less deeper than KEF R11 but it is also 239mm wider.
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 R11 is approximately 1213.7cm2 / 188.1inch2 and base area of the KEF R2c is approximately 1741.2cm2 / 269.9inch2. The R11 requires 30% less surface area than the R2c which gives it a small advantage on placement in tight spaces.
What's in the Box of KEF R11?
Here are the items that are included inside the box of R11:
- Floorstanding loudspeaker
- Grille
- 2 Foam port plugs
- 4 Outrigger feet
- 4 Spikes
- 4 Protective discs
- 4 Screws
- 4 Washers
- Wrench
- Hex-key
- User Manual
- Warranty Information
What's in the Box of KEF R2c?
Here are the items that come with the R2c:
- Center-channel loudspeaker
- Grille
- 4 Self-adhesive rubber feet
- User Manual
- Warranty Information