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KEF Q650c Review
KEF Q650c

Main Features

  • 11th Generation Uni-Q Driver
  • 1" Dome Tweeter
  • 2 x 6.5" aluminum Woofer
  • One 6.5-inch Passive Radiators
  • 64-28k Hz Frequency Response
  • 87 dB Sensitivity
  • Impedance: 8ohms
  • Power Range: 15-150watts
  • Weight:30.00 lbs / 13.64 kg
  • Dimensions(HxWxD): 8-5/16"x24-13/16"x11-15/16" / 212.0 x 631.0 x 304.0mm
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KEF Q650c Review
KEF Q650c KEF Q650c
See at AMAZON

KEF Q650c is a 2-way Passive Passive Radiator Center Channel speaker by KEF. Center channel speaker is an important component of a home theater system set-up as it delivers the listener significant part of the on-screen dialogue from your television. It features a 1" Dome Tweeter and 2 x 6.5" aluminum Woofer. Q650c also employs one 6.5-inch passive radiators. The speaker has a frequency range of 64-28k Hz and a sensitivity of 87 dB. KEF Q650c has an MSRP of 750$.

What size of room is the KEF Q650c speaker good for?

The size of the room in which you are planning to use the KEF Q650c is an important decision factor. Here we have evaluated its suitability to various sizes of environments considering its size and max power parameters:

Listening Environment* Suitability
Near-fieldPoor
Small RoomAverage
Mid-size RoomGood
Large RoomAverage
Very Large RoomPoor

(* 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.)

What are the speakers in KEF's Q Series?

Q650c is a member of KEF's Q series of Passive speakers. Below you can see the main specs of these speakers.

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


**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.

What is the Frequency Response of the KEF Q650c speaker?

KEF Q650c has a Frequency response range of 64-28k Hz at ±3dB (55Hz-50kHz (-6dB)) and Power Range of 15-150 watts. Here we have a comparison of how Q650c's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.

Low Frequency
Center Channel Speakers
KEF Q650c
Min
Average
Max
High Frequency
Center Channel Speakers
KEF Q650c
Min
Average
Max
KEF Q650c Woofer
KEF Q650c's aluminum Woofer



KEF Q650c Tweeter
KEF Q650c's vented aluminum Dome Tweeter

What is the Crossover frequency of KEF Q650c?

The Crossover frequency of the Q650c is set to 2500Hz. This is the threshold frequency where the higher frequency signals over this level are sent to the tweeter and the lower-frequency signals are sent to the woofer by the crossover component.

What are the Impedance and Sensitivity of the KEF Q650c? Is it an easy-to-drive speaker?

KEF Q650c's nominal impedance level is 8 ohms but can go down to as low as 4.2 ohms, and has a sensitivity of 87 dB.

Sensitivity
Center Channel Speakers
KEF Q650c
Min
Average
Max

8 Ohms is pretty much the standard nominal impedance amongst stereo speakers and amplifiers so KEF Q650c is not considered a difficult to drive speaker from nominal Impedance perspective.

Sensitivity

With a sensitivity level of only 87 dB, KEF Q650c is a difficult to drive speaker from Sensitivity perspective, make sure to choose an amplifier with a high output if you like listening to your music at high volume levels. You may especially have a hard time using Tube amplifiers which are traditionally very low power compared to Class A/B or Class D speakers.

Minimum Impedance of KEF Q650c

Even though the nominal impedance of the Q650c is 8 ohms, the minimum impedance level of this speaker according to KEF is 4.2 ohms KEF Q650c 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 Q650c:

  • Integrated Amps under 500 USD
  • Integrated Amps under 750 USD
  • Integrated Amps under 1000 USD
  • All Integrated Amplifiers

Input Type

Q650c features Binding post type connectors. Bi-amping and Bi-wiring are not possible.
KEF Q650c Back View
KEF Q650c Back View

KEF Q650c External Dimensions and Weight

KEF Q650c has external dimensions of (Height x Width x Depth) 8-5/16 x 24-13/16 x 11-15/16inch (212.0 x 631.0 x 304.0mm ).

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 Q650c is approximately 1918.2cm2 / 297.3inch2.

To get a better perspective on the real life size of KEF Q650c, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).

KEF Q650c Real Life Body Size Comparison
KEF Q650c Speaker Size Compared to a Compact Disc

Weight

The KEF Q650c weighs 13.64kg / 30lbs per piece. Here is a comparison of how Q650c's weight compares with the average, max and min weights in its class.

Weight
All Center Channel Speakers
KEF Q650c
Min
Average
Max
Weight
Center Channel Speakers under $750
KEF Q650c
Min
Average
Max

Cabinet type and Materials

KEF Q650c has a Passive Radiator type cabinet.

Speaker Feet

KEF Q650c comes with 4 Self-adhesive rubber feet which you can use to secure your loudspeaker on the surface that you are putting on.

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.

Available colors

KEF Q650c is available in Satin White, Satin Black and Walnut.

What's in the Box of KEF Q650c?

Here are the items that are included inside the box of Q650c:
  • Center-channel loudspeaker
  • 4 Self-adhesive rubber feet
  • Owners Manual
  • Warranty Information
  • Recommended Accessories

    Here is a list of accessories that we think you may need for the KEF Q650c.

    • Speaker Cable and Connectors
      • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
      • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
      • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
    • Vibration Isolators: IsoAcoustics isolatorsmore affordable options too.
    • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

    User's Manual

    For more information about how to setup, use and maintain the KEF Q650c, use the direct link below to download the official manual document:
    Download User Manual for KEF Q650c

    Official Brochure

    Here is a link to download the official brochure for the KEF Q650c speaker:
    Official Brochure for KEF Q650c

    Official Product Page

    Official manufacturer's product page for the KEF Q650c speaker can be found below:
    Official Product Page for KEF Q650c

    Warranty

    5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.

    KEF Q650c  Lifestyle
    KEF Q650c Lifestyle

    KEF Q650c Alternatives in Passive Center Channel Speakers
    Model Type Sensitivity Impedance Frequency
    Polk ES35
    Compare
    2-way 89 dB 8 ohms 66-40k Hz
    Klipsch RP-504C II
    Compare
    2-way 96 dB 8 ohms 50-25k Hz
    Emotiva Airmotiv C3+
    Compare
    3-way 92 dB 4 ohms 40 Hz – 28 kHz
    Klipsch RP-404C II
    Compare
    2-way 94 dB 8 ohms 87-25k Hz
    Wharfedale Diamond 12.C
    Compare
    2-way 90 dB 8 ohms 90-20k Hz
    Polk R400
    Compare
    2-way 89 dB 8 ohms 48-39K Hz
    Emotiva Airmotiv C2+
    Compare
    3-way 92 dB 4 ohms 45 Hz – 28 kHz
    Klipsch R-30C
    Compare
    2-way 96 dB 8 ohms 78-21k Hz
    Klipsch RP-500C II
    Compare
    2-way 96 dB 8 ohms 60-25k Hz
    BW HTM6 S3
    Compare
    2-way 87 dB 8 ohms 72-28k Hz
    Frequently Asked Questions about KEF Q650c
    What is the External Dimensions of KEF Q650c
    What is the Speaker Sensitivity of KEF Q650c
    is the KEF Q650c an easy to drive speaker?



    KEF Q650c Detailed Specifications

    General
    BrandKEF
    Full Model NameKEF Q650c
    Speaker Type2-way Center Channel
    Power Range15-150 watts
    Sensitivity87 dB
    Impedance8 ohms
    Max SPL110 dB
    Frequency Response64-28k Hz
    DRIVERS
    Woofer Size6.5-inch
    Woofer Compositionaluminum
    Woofer SurroundRubber
    Tweeter Size1-inch
    Tweeter TypeDome
    Crossover freq2500Hz

    CONNECTIONS
    Connector TypeBinding post
    PHYSICAL SPECS
    Height212.0mm ( 8-5/16-inch)
    Width631.0mm ( 24-13/16-inch)
    Depth304.0mm ( 11-15/16-inch)
    Height212.0mm ( 8-5/16-inch)
    Weight13.64kg ( 30.00 lbs)
    EnclosurePassive Radiator
    Available ColorsSatin White, Satin Black, Walnut
    Mounting BracketNo
    Grilleoptional
    Moisture ResistanceNo
    OTHER
    Handheld RemoteNo
    Parts Warranty5 Years
    Labor Warranty5 Years
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