In this review, we will be comparing SS-CS5 and Q150, two Passive Bookshelf speakers from Sony and KEF. Let's have a brief look at the main features
of Sony SS-CS5 and KEF Q150 first before getting into our more
detailed comparison.
What size room are the Sony SS-CS5 and KEF Q150 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 Sony SS-CS5 and KEF Q150 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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Drivers
One of the fundamental differences between these two speakers is that SS-CS5 is a 3-way design whereas the Q150 is a 2-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 |
Sony SS-CS5 |
KEF Q150 |
|
Driver Setup
|
3-way
|
2-way
|
|
Super Tweeter
|
0.75-inch |
- |
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 5.25-inch
|
1 x 5.25-inch
|
SS-CS5 features a 1" polyester fiber Soft-Dome Tweeter , a 0.75" Supertweeter and 1 x 5.25" Mica Reinforced Cellular (MRC) Woofer . On the other hand, the Q150 features a 1" vented aluminum Dome Tweeter and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 2500Hz.
Frequency Response
SS-CS5 has a frequency range of 53-50k Hz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 51Hz, the Q150 can go slightly deeper then the SS-CS5's min frequency of 53Hz.
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
High Frequency
Bookshelf 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
SS-CS5 is a 6 ohms speaker compared to the Q150 which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. SS-CS5 sensitivity is rated at 87 dB and the Q150's is rated at 86 dB. This 1 dB difference makes the Sony SS-CS5 a more sensitive speaker compared to KEF Q150, hence will play louder with the same amount of watts.
Sensitivity
Bookshelf 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.
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
SS-CS5 features Post type posts and Q150 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
Sony SS-CS5's Post terminals
KEF Q150's Post terminals
Cabinet Type and Port Position
Both SS-CS5 and Q150 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
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 Sony SS-CS5's and KEF Q150's external dimensions. Sony SS-CS5 has external dimensions of 335.0 x 178.0 x 220.0mm ( 13.1 x 7.0 x 8.6inch) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) .
Sony SS-CS5 is 2mm narrower and 58mm less deeper than KEF Q150 but it is also 32mm taller.
Below you can see the front view size comparison of Sony SS-CS5 and KEF Q150 in scale.
Comparison image of Sony SS-CS5 and KEF Q150 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 Sony SS-CS5 is approximately 391.6cm2 / 60.7inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The SS-CS5 requires 22% less surface area than the Q150 which gives it a small advantage on placement in tight spaces.
Here is an another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:
Size Comparison image of Sony SS-CS5 and KEF Q150 on a Media Console
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 Sony SS-CS5 weighs 4.50kg / 9.9lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the Q150 24% heavier than the SS-CS5.
Here is a comparison of how SS-CS5 and Q150's weights compare with the average, max and min weights in Passive Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of KEF Q150?
Here are the items that come with the Q150:
2 Bookshelf loudspeakers 2 Foam port plugs 8 Self-adhesive rubber feet Owner's Manual Warranty Registration Card
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
 Sensitivity |
87 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 High Frequency Response |
50k Hz
vs
28k Hz
|
Generates higher frequency |
 Base Surface Area |
391cm2 (178x220mm)
vs
500cm2 (180x278mm)
|
Takes less floor space |
 Price per pair* |
148USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
 Nominal Impedance |
8 ohms
vs
6 ohms
|
Less selective with amplifiers |
 Low Frequency Response |
51 Hz
vs
53 Hz
|
Generates deeper bass |
 Height |
303mm
vs
335mm
|
Easier to fit in smaller spaces |
| General |
Sony SS-CS5 |
KEF Q150 |
| Brand |
Sony |
KEF |
| Speaker Type |
Bookshelf speakers |
Bookshelf speakers |
| Power Range |
up to 100 watts |
10-100 watts |
| Sensitivity |
87 dB |
86 dB |
| Impedance |
6 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
53-50k Hz |
51-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
5.25" |
5.25" |
| Woofer Composition |
Mica Reinforced Cellular (MRC) |
Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Soft-Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
335.0mm (13.2") |
303.0mm (11.9") |
| Width |
178.0mm (7") |
180.0mm (7.1") |
| Depth |
220.0mm (8.7") |
278.0mm (10.9") |
| Weight |
4.50kg (9.9lbs) |
5.60kg (12.3lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF/Wood-veneer |
MDF/Vinyl-wrapped |
| Available Colors |
Black |
Black, Walnut, White |
| Mounting Bracket |
No |
No |
| Recommended Stand Height |
n/a |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
2 years |
5 Years |
| Labor Warranty |
2 years |
5 Years |