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KEF Q150 vs KEF Q650c Comparison

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KEF Q150

Passive Bookshelf | 51-28k Hz

KEF Q150
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KEF Q650c

Passive Center Channel | 64-28k Hz

KEF Q650c
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KEF Q150 KEF Q150
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KEF Q650c KEF Q650c
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KEF Q150
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KEF Q650c
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KEF Q150 vs KEF Q650c Speaker Comparison

In this review, we will be comparing two different type of speakers by KEF. KEF Q150 is a Bookshelf speaker whereas the Q650c is a Center Channel speaker.

Let's have a brief look at the main features of KEF Q150 and KEF Q650c first before getting into our more detailed comparison.

KEF Q150 Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 5.25" Aluminum Woofer
  • 51-28k Hz Frequency Response
  • 86 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:10-100watts
  • Weight:5.60kg
  • Dimensions (H x W x D): 303.0" x 7.0" x 10.9"( 303.0 x 180.0 x 278.0mm )

KEF Q650c Key Specs

  • 2-way Design
  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 2 x 6.5" aluminum Woofer
  • 64-28k Hz Frequency Response
  • 87 dB Sensitivity
  • Impedance: 8ohms
  • Power Range:15-150watts
  • Weight:13.64kg
  • Dimensions (H x W x D): 212.0" x 24-13/16" x 11-15/16"( 212.0 x 631.0 x 304.0mm )

Q150 and Q650c 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 Q150 and KEF Q650c 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 Q150 KEF Q650c
Near-field Average Poor
Small Room Good Average
Mid-size Room Average Good
Large Room Poor Average
Very Large Room Bad 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 Q150 and KEF Q650c 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 Q150 and Q650c are 2-way speakers.

Driver KEF Q150 KEF Q650c
Driver Setup 2-way 2-way
Tweeter 1-inch 1-inch
Midrange - -
Woofer 1 x 5.25-inch 2 x 6.5-inch

Q150 features a 1" vented aluminum Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz. On the other hand, the Q650c features a 1" vented aluminum Dome Tweeter and 2 x 6.5" aluminum Woofer with a Crossover frequency at 2500Hz.

Frequency Response

Q150 has a frequency range of 51-28k Hz whereas Q650c has a frequency range of 64-28k Hz. With a minimum frequency of 51Hz, the Q150 can go significantly deeper on the low side and provide stronger bass compared to the Q650c's min frequency of 64Hz.

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 Bookshelf class in our database.

Low Frequency

Bookshelf Speakers

Q150
Q650c
Min
Average
Max
High Frequency

Bookshelf Speakers

KEF Q150
KEF Q650c
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

Q150 and Q650c have the same Impedance of 8 ohms but where they differ is the sensitivity levels. Q150 sensitivity is rated at 86 dB and the Q650c's is at 87 dB. This 1 dB difference makes the KEF Q650c a more sensitive speaker compared to KEF Q150, hence will play louder with the same amount of watts.

Sensitivity

Bookshelf Speakers

Q150
Q650c
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.

Q150 can handle a max power of 150 watts RMS from the amp the whereas Q150 has a max power handling value of 100 watts RMS , 50 watts less than the Q650c.

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

Q150 features Binding post type posts and Q650c has a Binding post type posts. None of these speakers feature bi-amping/bi-wiring.

KEF Q150 Terminals
KEF Q150's Post terminals

KEF Q650cBinding post Terminals
KEF Q650c's Binding post terminals

KEF Q150  Port
KEF Q150 Port

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 Q150's and KEF Q650c's external dimensions. KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) whereas KEF Q650c has external dimensions of 212.0 x 631.0 x 304.0mm ( 8-5/16 x 24-13/16 x 11-15/16inch) .

KEF Q150 is 451mm narrower and 26mm less deeper than KEF Q650c but it is also 91mm taller.

Below you can see the front view size comparison of KEF Q150 and KEF Q650c in scale.

KEF Q150 vs KEF Q650c Size Comparison - Front View
Comparison image of KEF Q150 and KEF Q650c Size and External Dimensions

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 Q150 is approximately 500.4cm2 / 77.6inch2 and base area of the KEF Q650c is approximately 1918.2cm2 / 297.3inch2. The Q150 requires 74% less surface area than the Q650c which gives it a small advantage on placement in tight spaces.

What's in the Box of KEF Q150?

Here are the items that are included inside the box of Q150:
  • 2 Bookshelf loudspeakers
  • 2 Foam port plugs
  • 8 Self-adhesive rubber feet
  • Owner's Manual
  • Warranty Registration Card
  • What's in the Box of KEF Q650c?

    Here are the items that come with the Q650c:
  • Center-channel loudspeaker
  • 4 Self-adhesive rubber feet
  • Owners Manual
  • Warranty Information

  • Reasons to choose KEF Q150 over KEF Q650c
    Low Frequency Response 51 Hz vs 64 Hz Generates deeper bass
    Base Surface Area 500cm2 vs 1918cm2 Takes less floor space
    Price per pair* 600USD vs 750USD costs less (*prices may change depending on the seller, location and time)

    Reasons to choose KEF Q650c over KEF Q150

    Max Input Power 150 watts vs 100 watts Handle more power from your amplifier
    Sensitivity 87 dB vs 86 dB Play louder with same amount of amplification power
    Minimum Impedance 4.2 ohms vs 3.7 ohms Very low impedance levels puts more pressure on amplifier
    Woofer Size 6.5 inches vs 5.25 inches Larger woofer
    Number of Woofers 2 vs 1 More woofers
    Passive Radiator one 6.5-inch vs None Increases the bass performance
    Height 212mm vs 303mm Easier to fit in smaller spaces
    KEF Q150 vs KEF Q650c Specs Table
    Detailed comparison of specifications
    General KEF Q150 KEF Q650c
    Brand KEF KEF
    Speaker Type Bookshelf speakers Center channel speaker
    Power Range 10-100 watts 15-150 watts
    Sensitivity 86 dB 87 dB
    Impedance 8 ohms 8 ohms
    Impedance 3.7 ohms 4.2 ohms
    Frequency Response 51-28k Hz 64-28k Hz
    Drivers
    Woofer Quantity 1 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 rear n/a
    Physical Specs
    Height 303.0mm (11.9") 212.0mm (8.3")
    Width 180.0mm (7.1") 631.0mm (24.8")
    Depth 278.0mm (10.9") 304.0mm (12")
    Weight 5.60kg (12.3lbs) 13.64kg (30lbs)
    Enclosure Bass Reflex Passive Radiator
    Finish MDF/Vinyl-wrapped n/a
    Available Colors Black, Walnut, White Satin White, Satin Black, Walnut
    Mounting Bracket No No
    Recommended Stand Height 18-24" n/a
    Grille Yes optional
    Moisture Resistancy No No
    Connections
    Biamp Inputs No n/a
    Other
    Parts Warranty 5 Years 5 Years
    Labor Warranty 5 Years 5 Years

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