KEF R11 is a 3-way Passive Bass Reflex Floor-standing speaker by KEF. It features a 1" Dome Tweeter, 1 x 5" Midrange and 4 x 6.5" Hybrid Aluminum Woofer. The speaker has a frequency range of 46-28k Hz and a sensitivity of 90 dB. KEF R11 has an MSRP of 6000$ per pair but can often be found around 4800$ per pair.
Room Size Suitability
The size of the room where you plan to use the KEF R11 is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Bad |
| Small Room | Poor |
| Mid-size Room | Average |
| Large Room | Good |
| Very Large Room | Average |
(* 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.)
KEF's R Series of Loudspeakers
R11 is a member of KEF's R series of Passive speakers. Below you can see the main specs of these speakers.
KEF R Series Speakers
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Frequency Response of the KEF R11 Speaker
KEF R11 has a Frequency response range of 46-28k Hz at ±3dB and Power Range of 15-300 watts. With a minimum frequency of 46 Hz, R11 delivers moderate bass depth so depending on your use case, you might want to consider adding a subwoofer to your system.
Visit our Powered Subwoofers section to find out more about the available subwoofer options.
Here we have a comparison of how R11's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
Among the speakers in our database with a max MSRP price of 10000$ (Pair), these are the 5 Passive Floor-standing speakers that have the deeper bass levels than the KEF R11's 46Hz:
Crossover frequency of the KEF R11?
R11 is a 3-way speaker and its crossover frequency between the woofer and the midrange set to 400Hz and the Crossover frequency between the midrange and the tweeter is set to 2900Hz.
Impedance and Sensitivity
KEF R11's nominal impedance level is
8 ohms but can go down to as low as
3.2 ohms, and has a sensitivity of
90 dB.
Sensitivity
Floor-standing Speakers
8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so KEF R11 is not considered a difficult to drive speaker from nominal Impedance perspective.
Sensitivity
90dB of the KEF R11 is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise.
Minimum Impedance of the KEF R11
Even though the nominal impedance of the R11 is 8 ohms, the minimum impedance level of this speaker according to KEF is 3.2 ohms KEF R11 so while choosing an amplifier, you should ideally check if the unit you are considering can provide this impedance level.
Check the amplifiers that are in a similar price range to the KEF R11:
Input Type
R11 has Binding post type connectors and lets bi-amping/bi-wiring. Bi-wiring can enhance the overall transparency of your loudspeakers by using separate speaker wires for the low and high-frequency drivers from a single amplifier. Bi-amping, on the other hand, involves using separate amplifiers for the high and low-frequency drivers, potentially resulting in a greater dynamic range and reduced distortion.
KEF R11's Binding post terminals allows Bi-amping or bi-wiring
KEF R11 External Dimensions and Weight
KEF R11 has external dimensions of (Height x Width x Depth) 51-3/16 x 12-1/4 x 15-5/16inch (1301.0 x 312.0 x 389.0mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of KEF R11 is approximately 1213.7cm2 / 188.1inch2.
To get a better perspective on the real life size of KEF R11, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).
KEF R11 Speaker Size Compared to a Compact Disc
Here we place the KEF R11 virtually next to a standard width amplifier and turntable on a media center to get a better idea about the size.
KEF R11 Floor-standing Speaker next to a Media Stand
WeightThe KEF R11 weighs 37.70kg / 82.9lbs per piece. Here is a comparison of how R11's weight compares with the average, max and min weights in its class.
Weight
All Floor-standing Speakers
Weight
Floor-standing Speakers under $10000
Cabinet type and Materials
KEF R11 has a
Bass Reflex type cabinet and a MDF/Lacquer finish. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.
Speaker Feet
KEF R11 comes with the parts below which you can use to secure your loudspeaker on the surface that you are putting on:
4 Outrigger feet4 Spikes It is always recommended to use some kind of feet under all types of speakers. Besides limiting the movement of the speakers, it also compensates for non-flat surfaces and limits the contact surface area of the speaker. Rubber based feet also help isolating the vibrations within certain frequency ranges.
KEF R11 Feet
Port Position
KEF R11 is a rear-firing port speaker so you have to make sure you leave enough space between the back of the speaker and wall or bookshelf so that it has room to breathe. R11 comes with
2 Two-piece foam port plugs so if you don't have any choice but place the speakers too close to the walls or other surfaces, you can use these plugs in order to avoid boomy or too much bass.
Available colors
KEF R11 is available in Black Gloss, White Gloss and Walnut.
Does the KEF R11 come with a Grille?
R11 comes with removable grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.
KEF R11 with Grille
What's in the Box of KEF R11?
Here are the items that are included inside the box of R11:
Floorstanding loudspeakerGrille2 Foam port plugs4 Outrigger feet4 Spikes4 Protective discs4 Screws4 WashersWrenchHex-keyUser ManualWarranty Information
Recommended Accessories
Here is a list of accessories that we think you may need for the KEF R11.
User's Manual
For more information about how to setup, use and maintain the KEF R11, use the direct link below to download the official manual document:
Download User Manual for KEF R11
Official Brochure
Here is a link to download the official brochure for the KEF R11 speaker:
Official Brochure for KEF R11
Official Product Page
Official manufacturer's product page for the KEF R11 speaker can be found below:
Official Product Page for KEF R11
Warranty
5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.
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