In this review, we will be comparing Q650c and Ultra Center, two Passive Center Channel speakers from KEF and SVS. Let's have a brief look at the main features
of KEF Q650c and SVS Ultra Center first before getting into our more
detailed comparison.
What size room are the KEF Q650c and SVS Ultra Center 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:
In the following sections, we will get into more detail in order to better understand how the KEF Q650c and SVS Ultra Center 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
One of the fundamental differences between these two speakers is that Q650c is a 2-way design whereas the Ultra Center is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
KEF Q650c |
SVS Ultra Center |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
1 x 4-inch |
|
Woofer
|
2 x 6.5-inch
|
2 x 6.5-inch
|
Q650c features a 1" vented aluminum Dome Tweeter and 2 x 6.5" aluminum Woofer with a Crossover frequency at 2500Hz. On the other hand, the Ultra Center features a 1" aluminum Dome Tweeter , a 4" Midrange and 2 x 6.5" composite glass-fiber Woofer with a Crossover frequency at 500Hz and 2200Hz.
Frequency Response
Q650c has a frequency range of 64-28k Hz whereas Ultra Center has a frequency range of 45-32k Hz. With a minimum frequency of 45Hz, the Ultra Center 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 Center Channel class in our database.
Low Frequency
Center Channel Speakers
High Frequency
Center Channel Speakers
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
Q650c and Ultra Center have the same Impedance of 8 ohms and their sensitivity is also same at 87 dB.
Sensitivity
Center Channel Speakers
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.
Q650c can handle a max power of 225 watts RMS from the amp the whereas Q650c has a max power handling value of 150 watts RMS , 75 watts less than the Ultra Center.
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
Ultra Center features 5-Way post posts which make bi-amping or bi-wiring possible. Q650c has a Binding post which doesn't feature bi-amping/bi-wiring.
KEF Q650c's Binding post terminals
SVS Ultra Center's 5-Way post terminals allows Bi-amping or bi-wiring
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 Q650c's and SVS Ultra Center's external dimensions. 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) whereas SVS Ultra Center has external dimensions of 207.0 x 561.0 x 285.0mm ( 8-1/8 x 22-1/16 x 11-3/16inch) .
KEF Q650c is clearly the larger of the two speakers. Its body is 70mm wider, 5mm taller and 19mm deeper than SVS Ultra Center.
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 Q650c is approximately 1918.2cm2 / 297.3inch2 and base area of the SVS Ultra Center is approximately 1598.9cm2 / 247.8inch2. The Q650c requires 20% more surface area than the Ultra Center which gives it a small disadvantage 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 Q650c weighs 13.64kg / 30lbs and the SVS Ultra Center weighs 14.09kg / 31lbs. This makes the Ultra Center 3% heavier than the Q650c.
Here is a comparison of how Q650c and Ultra Center's weights compare with the average, max and min weights in Passive Center Channel class.
Weight
All Center Channel Speakers
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
What's in the Box of SVS Ultra Center?
Here are the items that come with the Ultra Center:
Center channel loudspeakerGrille2 Terminal jumpers (pre-installed)4 Rubber feetOwners ManualSVS brochureOnline Product Registration Card
 Passive Radiator |
one 6.5-inch
vs
None
|
Increases the bass performance |
 Price per pair* |
750USD
vs
799USD
|
costs less (*prices may change depending on the seller, location and time) |
 Max Input Power |
225 watts
vs
150 watts
|
Handle more power from your amplifier |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Low Frequency Response |
45 Hz
vs
64 Hz
|
Generates deeper bass |
 High Frequency Response |
32k Hz
vs
28k Hz
|
Generates higher frequency |
 Height |
207mm
vs
212mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1598cm2 (561x285mm)
vs
1918cm2 (631x304mm)
|
Takes less floor space |
| General |
KEF Q650c |
SVS Ultra Center |
| Brand |
KEF |
SVS |
| Speaker Type |
Center channel speaker |
Center channel speaker |
| Power Range |
15-150 watts |
20-225 watts |
| Sensitivity |
87 dB |
87 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
4.2 ohms |
n/a |
| Frequency Response |
64-28k Hz |
45-32k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
6.5" |
6.5" |
| Woofer Composition |
aluminum |
composite glass-fiber |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
4" |
| Crossover Frequency |
2500Hz |
500Hz and 2200Hz |
| Firing Direction |
n/a |
rear |
Physical Specs |
|
|
| Height |
212.0mm (8.3") |
207.0mm (8.1") |
| Width |
631.0mm (24.8") |
561.0mm (22.1") |
| Depth |
304.0mm (12") |
285.0mm (11.2") |
| Weight |
13.64kg (30lbs) |
14.09kg (31lbs) |
| Enclosure |
Passive Radiator |
Bass Reflex |
| Available Colors |
Satin White, Satin Black, Walnut |
Black Oak,Piano Gloss Black,Piano Gloss White |
| Grille |
optional |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
n/a |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |