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-field | Poor |
| Small Room | Average |
| Mid-size Room | Good |
| Large Room | Average |
| Very Large Room | 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.)
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
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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
High Frequency
Center Channel Speakers
KEF Q650c's aluminum Woofer
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
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:
Input Type
Q650c features Binding post type connectors. Bi-amping and Bi-wiring are not possible.
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 Speaker Size Compared to a Compact Disc
WeightThe 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
Weight
Center Channel Speakers under $750
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.
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