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KEF Q950 vs KEF Q550 Comparison

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KEF Q950

Passive Floor-standing | 44-28k Hz

KEF Q950
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KEF Q550

Passive Floor-standing | 58-28k Hz

KEF Q550
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KEF Q950 KEF Q950
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KEF Q550 KEF Q550
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KEF Q950
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KEF Q550
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KEF Q950 vs KEF Q550 Speaker Comparison

In this review, we will be comparing Q950 and Q550, two Passive Floor-standing speakers by KEF

Let's have a brief look at the main features of KEF Q950 and KEF Q550 first before getting into our more detailed comparison.

KEF Q950 Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1.5" Dome Tweeter
  • 2 x 8.0" Aluminum Woofer
  • 44-28k Hz Frequency Response
  • 91 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-200watts
  • Weight:20.68kg
  • Dimensions (H x W x D): 1117.0" x 14-1/4" x 12-3/8"( 1117.0 x 362.0 x 315.0mm )

KEF Q550 Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 2 x 5.25" Aluminum Woofer
  • 58-28k Hz Frequency Response
  • 87 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-130watts
  • Weight:14.55kg
  • Dimensions (H x W x D): 894.0" x 11-5/8" x 12-5/16"( 894.0 x 296.0 x 313.0mm )

Q950 and Q550 are members of KEF's Q series of speakers. Below you can find the loudspeakers from this series.

KEF Q Series History
Model Body Frequency SensitivityImpedance Woofer
KEF Q150
  
Bookshelf 51-28k Hz 86 dB8Ω 1 x 5.25"
KEF Q350
  
Bookshelf 63-28k Hz 87 dB8Ω 1 x 6.5"
KEF Q950
Floor-standing 44-28k Hz 91 dB8Ω 2 x 8.0"
KEF Q750
  
Floor-standing 48-28k Hz 88 dB8Ω 2 x 6.5"
KEF Q550
Floor-standing 58-28k Hz 87 dB8Ω 2 x 5.25"
KEF Q650c
  
Center Channel 64-28k Hz 87 dB8Ω 2 x 6.5"
KEF Q250c
  
Center Channel 68-28k Hz 87 dB8Ω 1 x 5.25"

What size room are the KEF Q950 and KEF Q550 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 Q950 KEF Q550
Near-field Bad Bad
Small Room Poor Poor
Mid-size Room Good Good
Large Room Good Good
Very Large Room Poor 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 Q950 and KEF Q550 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 Q950 and Q550 are 2-way speakers.

Driver KEF Q950 KEF Q550
Driver Setup 2-way 2-way
Tweeter 1.5-inch 1-inch
Midrange - -
Woofer 2 x 8.0-inch 2 x 5.25-inch

Q950 features a 1.5" vented aluminum Dome Tweeter and 2 x 8.0" Aluminum Woofer with a Crossover frequency at 2200Hz. On the other hand, the Q550 features a 1" vented aluminum Dome Tweeter and 2 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz.

Frequency Response

Q950 has a frequency range of 44-28k Hz whereas Q550 has a frequency range of 58-28k Hz. With a minimum frequency of 44Hz, the Q950 can go significantly deeper on the low side and provide stronger bass compared to the Q550's min frequency of 58Hz.

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

Q950
Q550
Min
Average
Max
High Frequency

Floor-standing Speakers

KEF Q950
KEF Q550
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

Q950 and Q550 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q950 sensitivity is rated at 91 dB and the Q550's is at 87 dB. This 4 dB difference makes the KEF Q950 a more sensitive speaker compared to KEF Q550, hence will play louder with the same amount of watts.

Sensitivity

Floor-standing Speakers

Q950
Q550
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.

Q950 can handle a max power of 200 watts RMS from the amp the whereas Q550 has a max power handling value of 130 watts RMS, 70 watts less than the Q950.

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

Q950 features Binding post type posts and Q550 has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.

Cabinet Type and Port Position

Both Q950 and Q550 have front firing ports. front ported speakers offers more flexibility in placement in regards to proximity to walls&surfaces compared to rear ported speakers.

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 Q950's and KEF Q550's external dimensions. KEF Q950 has external dimensions of 1117.0 x 362.0 x 315.0mm ( 43-15/16 x 14-1/4 x 12-3/8inch) whereas KEF Q550 has external dimensions of 894.0 x 296.0 x 313.0mm ( 35-3/16 x 11-5/8 x 12-5/16inch) .

KEF Q950 is clearly the larger of the two speakers. Its body is 66mm wider, 223mm taller and 2mm deeper than KEF Q550.

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 Q950 is approximately 1140.3cm2 / 176.7inch2 and base area of the KEF Q550 is approximately 926.5cm2 / 143.6inch2. The Q950 requires 23% more surface area than the Q550 which gives it a small disadvantage 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 Q950 weighs 20.68kg / 45.5lbs and the KEF Q550 weighs 14.55kg / 32lbs. This makes the Q950 42% heavier than the Q550.

Here is a comparison of how Q950 and Q550's weights compare with the average, max and min weights in Passive Floor-standing class.

Weight
All Floor-standing Speakers
KEF Q950
KEF Q550
Min
Average
Max

What's in the Box of KEF Q950?

Here are the items that are included inside the box of Q950:
  • Floorstanding loudspeaker
  • 2 Outrigger feet
  • 4 Spikes
  • 6 Screws
  • 6 Washers
  • 4 Rubber inserts
  • Hex-key
  • Owners Manual
  • Warranty Information
  • What's in the Box of KEF Q550?

    Here are the items that come with the Q550:
  • Floorstanding loudspeaker
  • 2 Outrigger feet
  • 4 Spikes
  • 6 Screws
  • 6 Washers
  • 4 Rubber inserts
  • Hex-key
  • Owners Manual
  • Warranty Information

  • Reasons to choose KEF Q950 over KEF Q550
    Max Input Power 200 watts vs 130 watts Handle more power from your amplifier
    Sensitivity 91 dB vs 87 dB Play louder with same amount of amplification power
    Woofer Size 8.0 inches vs 5.25 inches Larger woofer
    Low Frequency Response 44 Hz vs 58 Hz Generates deeper bass

    Reasons to choose KEF Q550 over KEF Q950

    Minimum Impedance 3.5 ohms vs 3.2 ohms Very low impedance levels puts more pressure on amplifier
    Height 894mm vs 1117mm Easier to fit in smaller spaces
    Base Surface Area 926cm2 vs 1140cm2 Takes less floor space
    Price per pair* 1400USD vs 2200USD costs less (*prices may change depending on the seller, location and time)
    KEF Q950 vs KEF Q550 Specs Table
    Detailed comparison of specifications
    General KEF Q950 KEF Q550
    Brand KEF KEF
    Speaker Type Floor-standing speaker Floor-standing speaker
    Power Range 15-200 watts 15-130 watts
    Sensitivity 91 dB 87 dB
    Impedance 8 ohms 8 ohms
    Impedance 3.2 ohms 3.5 ohms
    Frequency Response 44-28k Hz 58-28k Hz
    Drivers
    Woofer Quantity 2 2
    Woofer Size 8.0" 5.25"
    Woofer Composition Aluminum Aluminum
    Woofer Surround Material Rubber Rubber
    Tweeter Size 1.5" 1"
    Tweeter Type Dome Dome
    Aimable Tweeter No No
    Midrange Driver No No
    Crossover Frequency 2200Hz 2500Hz
    Firing Direction front front
    Physical Specs
    Height 1117.0mm (44") 894.0mm (35.2")
    Width 362.0mm (14.3") 296.0mm (11.7")
    Depth 315.0mm (12.4") 313.0mm (12.3")
    Weight 20.68kg (45.5lbs) 14.55kg (32lbs)
    Enclosure Passive Radiator Passive Radiator
    Finish MDF/Wood-grain vinyl MDF/Wood-grain vinyl
    Available Colors Walnut Walnut
    Moisture Resistancy No No
    Connections
    Biamp Inputs No No
    Other
    Parts Warranty 5 Years 5 Years
    Labor Warranty 5 Years 5 Years

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