KEF Q650c is a 2-way Passive Radiator Center Channel speaker by KEF. It was released in May 2017. 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$.
Room Size Suitability
The size of the room where you plan to use the KEF Q650c is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| 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.)
KEF later replaced Q650c with Q6 Meta. Follow the link to read our in-depth comparison of these speakers:
Compare KEF Q650c vs KEF Q6 Meta
KEF Q650c Lifestyle
KEF's Q Series of Loudspeakers
Q650c is a member of KEF's Q series of Passive speakers. The Q Series is KEF's long-running affordable range, built around the Uni-Q concentric driver. Below you can see the main specs of these speakers.
See all 7 KEF Q models compared »
KEF Q Series Speakers
Frequency Response of the KEF Q650c Speaker
KEF Q650c has a Frequency response range of 64-28k Hz and Power Range of 15-150 watts.
Here we have a comparison of how Q650c's Low frequency value compares with the average, max and min Low frequency values in its class.
Low Frequency
Center Channel Speakers
KEF Q650c's aluminum Woofer
KEF Q650c's vented aluminum Dome Tweeter
Crossover frequency of the 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.
Impedance and Sensitivity
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 amps. Work out how loud the KEF Q650c plays in your room →
Minimum Impedance of the 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.
What amplifier does the KEF Q650c need?
At normal listening levels in a medium room, about
15–150 W
per channel into 8 ohms.
Set your own conditions and we will rank every amplifier we cover.
Prefer to browse? Integrated amplifiers under $750, or every amplifier we cover.
Input Type
Q650c features Binding post type connectors.
Work out what gauge speaker cable this run needs →
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
Find speakers that fit your shelf or alcove →
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.