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KEF R11 vs Focal Aria 948 Comparison

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KEF R11

Passive Floor-standing | 46-28k Hz

KEF R11
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Focal Aria 948

Passive Floor-standing | 37-28k Hz

Focal Aria 948
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KEF R11 KEF R11
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Focal Aria 948 Focal Aria 948
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KEF R11
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Focal Aria 948
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KEF R11 vs Focal Aria 948 Speaker Comparison

In this review, we will be comparing R11 and Aria 948, two Passive Floor-standing speakers from KEF and Focal.

Let's have a brief look at the main features of KEF R11 and Focal Aria 948 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 )

Focal Aria 948 Key Specs

  • 3-way Design
  • 1" inverted dome Tweeter
  • 6.5" Midrange
  • 2 x 8.25" Flax Woofer
  • 6.5" Midrange
  • 37-28k Hz Frequency Response
  • 92.5 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:50-350watts
  • Weight:35.00kg
  • Dimensions (H x W x D): 1150.0" x 14-5/8" x 16-9/16"( 1150.0 x 372.0 x 421.0mm )

What size room are the KEF R11 and Focal Aria 948 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 Focal Aria 948
Near-field Bad Are you nuts?
Small Room Poor Poor
Mid-size Room Average Average
Large Room Good Good
Very Large Room Average Good

(* 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 Focal Aria 948 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 Aria 948 are 3-way speakers.

Driver KEF R11 Focal Aria 948
Driver Setup 3-way 3-way
Tweeter 1-inch 1-inch
Midrange 1 x 5-inch 1 x 6.5-inch
Woofer 4 x 6.5-inch 2 x 8.25-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 Aria 948 features a 1" TNF Al/Mg inverted dome Tweeter , a 6.5" Midrange and 2 x 8.25" Flax Woofer with a Crossover frequency at 280Hz and 2,600Hz.

Frequency Response

R11 has a frequency range of 46-28k Hz whereas Aria 948 has a frequency range of 37-28k Hz. With a minimum frequency of 37Hz, the Aria 948 can go significantly deeper on the low side and provide stronger bass compared to the R11's min frequency of 46Hz.

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
Aria 948
Min
Average
Max
High Frequency

Floor-standing Speakers

KEF R11
Focal Aria 948
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 Aria 948 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. R11 sensitivity is rated at 90 dB and the Aria 948's is at 92.5 dB. This 3 dB difference makes the Focal Aria 948 a more sensitive speaker compared to KEF R11, hence will play louder with the same amount of watts.

Sensitivity

Floor-standing Speakers

R11
Aria 948
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 350 watts RMS from the amp the whereas R11 has a max power handling value of 300 watts RMS , 50 watts less than the Aria 948.

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

R11 features Binding post posts which make bi-amping or bi-wiring possible. Aria 948 has a Binding post which doesn't feature bi-amping/bi-wiring.

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

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 Focal Aria 948'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 Focal Aria 948 has external dimensions of 1150.0 x 372.0 x 421.0mm ( 45-1/4 x 14-5/8 x 16-9/16inch) .

KEF R11 is 60mm narrower and 32mm less deeper than Focal Aria 948 but it is also 151mm taller.

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 Focal Aria 948 is approximately 1566.1cm2 / 242.7inch2. The R11 requires 23% less surface area than the Aria 948 which gives it a small advantage on placement in tight spaces.

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 R11 weighs 37.70kg / 82.9lbs and the Focal Aria 948 weighs 35.00kg / 77lbs. This makes the R11 8% heavier than the Aria 948.

Here is a comparison of how R11 and Aria 948's weights compare with the average, max and min weights in Passive Floor-standing class.

Weight
All Floor-standing Speakers
KEF R11
Focal Aria 948
Min
Average
Max

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 Focal Aria 948?

    Here are the items that come with the Aria 948:
  • Floorstanding loudspeaker
  • Grille
  • Base
  • 4 Spike feet (pre-installed in base)
  • 4 Plastic feet
  • 4 Screws
  • Allen-key
  • Hex-tool
  • User Manual

  • Reasons to choose KEF R11 over Focal Aria 948
    Minimum Impedance 3.2 ohms vs 2.5 ohms Very low impedance levels puts more pressure on amplifier
    Number of Woofers 4 vs 2 More woofers
    Bi-Amping and Bi-Wiring Yes vs No Allows bi-amping and bi-wiring connections
    Base Surface Area 1213cm2 vs 1566cm2 Takes less floor space
    Price per pair* 6000USD vs 6598USD costs less (*prices may change depending on the seller, location and time)

    Reasons to choose Focal Aria 948 over KEF R11

    Max Input Power 350 watts vs 300 watts Handle more power from your amplifier
    Sensitivity 93 dB vs 90 dB Play louder with same amount of amplification power
    Woofer Size 8.25 inches vs 6.5 inches Larger woofer
    Low Frequency Response 37 Hz vs 46 Hz Generates deeper bass
    Height 1150mm vs 1301mm Easier to fit in smaller spaces
    KEF R11 vs Focal Aria 948 Specs Table
    Detailed comparison of specifications
    General KEF R11 Focal Aria 948
    Brand KEF Focal
    Speaker Type Floor-standing speaker Floor-standing speaker
    Power Range 15-300 watts 50-350 watts
    Sensitivity 90 dB 92.5 dB
    Impedance 8 ohms 8 ohms
    Impedance 3.2 ohms 2.5 ohms
    Frequency Response 46-28k Hz 37-28k Hz
    Drivers
    Woofer Quantity 4 2
    Woofer Size 6.5" 8.25"
    Woofer Composition Hybrid Aluminum Flax
    Woofer Surround Material Rubber Rubber
    Tweeter Size 1" 1"
    Tweeter Type Dome inverted dome
    Aimable Tweeter No No
    Midrange Driver 5" 6.5"
    Crossover Frequency 400Hz and 2900Hz 280Hz and 2,600Hz
    Firing Direction rear n/a
    Physical Specs
    Height 1301.0mm (51.2") 1150.0mm (45.3")
    Width 312.0mm (12.3") 372.0mm (14.6")
    Depth 389.0mm (15.3") 421.0mm (16.6")
    Weight 37.70kg (82.9lbs) 35.00kg (77lbs)
    Enclosure Bass Reflex Bass Reflex
    Finish MDF/Lacquer MDF/Glass/Leather
    Available Colors Black Gloss, White Gloss, Walnut Gloss Black
    Grille Yes Yes
    Moisture Resistancy No No
    Connections
    Biamp Inputs Yes No
    Other
    Parts Warranty 5 Years 5 Years
    Labor Warranty 5 Years 5 Years

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