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KEF R11 vs KEF R2c Comparison

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KEF R11

Passive Floor-standing | 46-28k Hz

KEF R11
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KEF R2c

Passive Center Channel | 74-28k Hz

KEF R2c
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KEF R11 KEF R11
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KEF R2c KEF R2c
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KEF R11
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KEF R2c
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KEF R11 vs KEF R2c Speaker Comparison

In this review, we will be comparing two different type 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.

KEF R11 Key Specs

  • 3-way Design
  • 1" Dome Tweeter
  • 5" Midrange
  • 4 x 6.5" Hybrid Aluminum Woofer
  • 46-28k Hz Frequency Response
  • 90 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-300watts
  • Weight:37.70kg
  • Dimensions (H x W x D): 1301.0" x 12-1/4" x 15-5/16"( 1301.0 x 312.0 x 389.0mm )

KEF R2c Key Specs

  • 3-way Design
  • 1" Dome Tweeter
  • 5" Midrange
  • 2 x 5.25" Hybrid Aluminum Woofer
  • 5" Midrange
  • 74-28k Hz Frequency Response
  • 87 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-200watts
  • Weight:16.90kg
  • Dimensions (H x W x D): 177.0" 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.

KEF R Series History
Model Body Frequency SensitivityImpedance Woofer
KEF R3
  
Bookshelf 52-28k Hz 87 dB8Ω 1 x 6.5"
KEF R7
  
Floor-standing 48-28k Hz 88 dB8Ω 2 x 6.5"
KEF R11
Floor-standing 46-28k Hz 90 dB8Ω 4 x 6.5"
KEF R5
  
Floor-standing 58-28k Hz 87 dB8Ω 2 x 5.25"
KEF R2c
Center Channel 74-28k Hz 87 dB8Ω 2 x 5.25"

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.)

In the following sections, we will get into more detail in order to better understand how the KEF R11 and KEF R2c 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

Both R11 and R2c are 3-way speakers.

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.

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 Floor-standing class in our database.

Low Frequency

Floor-standing Speakers

R11
R2c
Min
Average
Max
High Frequency

Floor-standing Speakers

KEF R11
KEF R2c
Min
Average
Max

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

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

R11
R2c
Min
Average
Max

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.

R11 can handle a max power of 300 watts RMS from the amp the whereas R2c has a max power handling value of 200 watts RMS, 100 watts less than the R11.

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

Both R11 and R2c features dual binding post speaker terminals for bi-amping or bi-wiring.

KEF R11 Terminals
KEF R11's Binding post terminals allows Bi-amping or bi-wiring

KEF R2c Terminals
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

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 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

  • Reasons to choose KEF R11 over KEF R2c
    Max Input Power 300 watts vs 200 watts Handle more power from your amplifier
    Sensitivity 90 dB vs 87 dB Play louder with same amount of amplification power
    Woofer Size 6.5 inches vs 5.25 inches Larger woofer
    Number of Woofers 4 vs 2 More woofers
    Low Frequency Response 46 Hz vs 74 Hz Generates deeper bass
    Base Surface Area 1213cm2 vs 1741cm2 Takes less floor space

    Reasons to choose KEF R2c over KEF R11

    Height 177mm vs 1301mm Easier to fit in smaller spaces
    Price per pair* 1300USD vs 6000USD costs less (*prices may change depending on the seller, location and time)
    KEF R11 vs KEF R2c Specs Table
    Detailed comparison of specifications
    General KEF R11 KEF R2c
    Brand KEF KEF
    Speaker Type Floor-standing speaker Center channel speaker
    Power Range 15-300 watts 15-200 watts
    Sensitivity 90 dB 87 dB
    Impedance 8 ohms 8 ohms
    Impedance 3.2 ohms 3.2 ohms
    Frequency Response 46-28k Hz 74-28k Hz
    Drivers
    Woofer Quantity 4 2
    Woofer Size 6.5" 5.25"
    Woofer Composition Hybrid Aluminum Hybrid Aluminum
    Woofer Surround Material Rubber Rubber
    Tweeter Size 1" 1"
    Tweeter Type Dome Dome
    Aimable Tweeter No No
    Midrange Driver 5" 5"
    Crossover Frequency 400Hz and 2900Hz 400Hz and 2900Hz
    Firing Direction rear rear
    Physical Specs
    Height 1301.0mm (51.2") 177.0mm (7")
    Width 312.0mm (12.3") 551.0mm (21.7")
    Depth 389.0mm (15.3") 316.0mm (12.4")
    Weight 37.70kg (82.9lbs) 16.90kg (37.2lbs)
    Enclosure Bass Reflex Acoustic Suspension
    Finish MDF/Lacquer n/a
    Available Colors Black Gloss, White Gloss, Walnut Black Gloss, White Gloss, Walnut
    Grille Yes Yes
    Moisture Resistancy No No
    Connections
    Biamp Inputs Yes Yes
    Other
    Parts Warranty 5 Years 5 Years
    Labor Warranty 5 Years 5 Years

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