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KEF Q550 vs KEF Q750 Comparison

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KEF Q550

Passive Floor-standing | 58-28k Hz

KEF Q550
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KEF Q750

Passive Floor-standing | 48-28k Hz

KEF Q750
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KEF Q550 KEF Q550
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KEF Q750 KEF Q750
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KEF Q550
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KEF Q750
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KEF Q550 vs KEF Q750 Speaker Comparison

In this review, we will be comparing Q550 and Q750, two Passive Floor-standing speakers by KEF

Let's have a brief look at the main features of KEF Q550 and KEF Q750 first before getting into our more detailed comparison.

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 )

KEF Q750 Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 2 x 6.5" Aluminum Woofer
  • 48-28k Hz Frequency Response
  • 88 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-150watts
  • Weight:16.59kg
  • Dimensions (H x W x D): 945.0" x 12-7/8" x 12-3/8"( 945.0 x 328.0 x 315.0mm )

Q550 and Q750 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 Q550 and KEF Q750 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 Q550 KEF Q750
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 Q550 and KEF Q750 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 Q550 and Q750 are 2-way speakers.

Driver KEF Q550 KEF Q750
Driver Setup 2-way 2-way
Tweeter 1-inch 1-inch
Midrange - -
Woofer 2 x 5.25-inch 2 x 6.5-inch

Q550 features a 1" vented aluminum Dome Tweeter and 2 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz. On the other hand, the Q750 features a 1" vented aluminum Dome Tweeter and 2 x 6.5" Aluminum Woofer with a Crossover frequency at 2500Hz.

Frequency Response

Q550 has a frequency range of 58-28k Hz whereas Q750 has a frequency range of 48-28k Hz. With a minimum frequency of 48Hz, the Q750 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

Q550
Q750
Min
Average
Max
High Frequency

Floor-standing Speakers

KEF Q550
KEF Q750
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

Q550 and Q750 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q550 sensitivity is rated at 87 dB and the Q750's is at 88 dB. This 1 dB difference makes the KEF Q750 a more sensitive speaker compared to KEF Q550, hence will play louder with the same amount of watts.

Sensitivity

Floor-standing Speakers

Q550
Q750
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.

Q550 can handle a max power of 150 watts RMS from the amp the whereas Q550 has a max power handling value of 130 watts RMS , 20 watts less than the Q750.

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

Q550 features Binding post type posts and Q750 has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.

KEF Q750 Terminals
KEF Q750's Binding post terminals

Cabinet Type and Port Position

Both Q550 and Q750 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 Q550's and KEF Q750's external dimensions. 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) whereas KEF Q750 has external dimensions of 945.0 x 328.0 x 315.0mm ( 37-3/16 x 12-7/8 x 12-3/8inch) .

KEF Q750 is clearly the larger of the two speakers. Its body is 32mm wider, 51mm 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 Q550 is approximately 926.5cm2 / 143.6inch2 and base area of the KEF Q750 is approximately 1033.2cm2 / 160.1inch2. The Q550 requires 10% less surface area than the Q750 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 Q550 weighs 14.55kg / 32lbs and the KEF Q750 weighs 16.59kg / 36.5lbs. This makes the Q750 14% heavier than the Q550.

Here is a comparison of how Q550 and Q750's weights compare with the average, max and min weights in Passive Floor-standing class.

Weight
All Floor-standing Speakers
KEF Q550
KEF Q750
Min
Average
Max

What's in the Box of KEF Q550?

Here are the items that are included inside the box of Q550:
  • 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 Q750?

    Here are the items that come with the Q750:
  • Floorstanding loudspeaker
  • 2 Outrigger feet
  • 4 Spikes
  • 6 Screws
  • 6 Washers
  • 4 Rubber inserts
  • Hex-key
  • Owners Manual
  • Warranty Information

  • Reasons to choose KEF Q550 over KEF Q750
    Height 894mm vs 945mm Easier to fit in smaller spaces
    Base Surface Area 926cm2 vs 1033cm2 Takes less floor space
    Price per pair* 1400USD vs 1800USD costs less (*prices may change depending on the seller, location and time)

    Reasons to choose KEF Q750 over KEF Q550

    Max Input Power 150 watts vs 130 watts Handle more power from your amplifier
    Sensitivity 88 dB vs 87 dB Play louder with same amount of amplification power
    Minimum Impedance 3.8 ohms vs 3.5 ohms Very low impedance levels puts more pressure on amplifier
    Woofer Size 6.5 inches vs 5.25 inches Larger woofer
    Low Frequency Response 48 Hz vs 58 Hz Generates deeper bass
    KEF Q550 vs KEF Q750 Specs Table
    Detailed comparison of specifications
    General KEF Q550 KEF Q750
    Brand KEF KEF
    Speaker Type Floor-standing speaker Floor-standing speaker
    Power Range 15-130 watts 15-150 watts
    Sensitivity 87 dB 88 dB
    Impedance 8 ohms 8 ohms
    Impedance 3.5 ohms 3.8 ohms
    Frequency Response 58-28k Hz 48-28k Hz
    Drivers
    Woofer Quantity 2 2
    Woofer Size 5.25" 6.5"
    Woofer Composition Aluminum Aluminum
    Woofer Surround Material Rubber Rubber
    Tweeter Size 1" 1"
    Tweeter Type Dome Dome
    Aimable Tweeter No No
    Midrange Driver No No
    Crossover Frequency 2500Hz 2500Hz
    Firing Direction front front
    Physical Specs
    Height 894.0mm (35.2") 945.0mm (37.2")
    Width 296.0mm (11.7") 328.0mm (12.9")
    Depth 313.0mm (12.3") 315.0mm (12.4")
    Weight 14.55kg (32lbs) 16.59kg (36.5lbs)
    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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