In this review, we will be comparing S10 and Q150, two Passive Bookshelf speakers from Polk Audio and KEF. Let's have a brief look at the main features
of Polk S10 and KEF Q150 first before getting into our more
detailed comparison.
What size room are the Polk S10 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 Polk S10 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
Both S10 and Q150 are 2-way speakers.
| Driver |
Polk S10 |
KEF Q150 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
1 x 4-inch
|
1 x 5.25-inch
|
S10 features a 1" Terylene Soft-Dome Tweeter and 1 x 4" Mica-reinforced polypropylene Woofer with a Crossover frequency at 2500Hz. 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
S10 has a frequency range of 67-40k Hz whereas Q150 has a frequency range of 51-28k Hz. With a minimum frequency of 51Hz, the Q150 can go significantly deeper on the low side and provide stronger bass compared to the S10's min frequency of 67Hz.
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
S10 and Q150 have the same Impedance of 8 ohms but where they differ is the sensitivity levels. S10 sensitivity is rated at 87 dB and the Q150's is at 86 dB. This 1 dB difference makes the Polk S10 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
S10 features Post type posts and Q150 has a Post type posts. None of these speakers feature bi-amping/bi-wiring.
Polk S10's 5-way post terminals
KEF Q150's Post terminals
Cabinet Type and Port Position
Both S10 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 Polk S10's and KEF Q150's external dimensions. Polk S10 has external dimensions of 214.0 x 127.0 x 155.0mm ( 8.4 x 5.0 x 6.1inch) whereas KEF Q150 has external dimensions of 303.0 x 180.0 x 278.0mm ( 11.9 x 7.0 x 10.9inch) .
KEF Q150 is clearly the larger of the two speakers. Its body is 53mm wider, 89mm taller and 123mm deeper than Polk S10.
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 Polk S10 is approximately 196.9cm2 / 30.5inch2 and base area of the KEF Q150 is approximately 500.4cm2 / 77.6inch2. The S10 requires 61% less surface area than the Q150 which gives it a small advantage 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 Polk S10 weighs 2.73kg / 6lbs and the KEF Q150 weighs 5.60kg / 12.3lbs. This makes the Q150 105% heavier than the S10.
Here is a comparison of how S10 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 Polk S10?
Here are the items that are included inside the box of S10:
2 Bookshelf loudspeakers2 Grille (attached)8 Self-adhesive rubber feetWall-mount templateOwners ManualOnline Product Registration
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
 Sensitivity |
87 dB
vs
86 dB
|
Play louder with same amount of amplification power |
 High Frequency Response |
40k Hz
vs
28k Hz
|
Generates higher frequency |
 Mounting Bracket |
Yes
vs
No
|
Allows mounting on walls |
 Height |
214mm
vs
303mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
196cm2 (127x155mm)
vs
500cm2 (180x278mm)
|
Takes less floor space |
 Woofer Size |
5.25 inches
vs
4 inches
|
Larger woofer |
| Low Frequency Response |
51 Hz
vs
67 Hz
|
Generates deeper bass |
| General |
Polk Audio Signature S10 |
KEF Q150 |
| Brand |
Polk Audio |
KEF |
| Speaker Type |
Satellite speakers |
Bookshelf speakers |
| Power Range |
20-100 watts |
10-100 watts |
| Sensitivity |
87 dB |
86 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.7 ohms |
| Frequency Response |
67-40k Hz |
51-28k Hz |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
4" |
5.25" |
| Woofer Composition |
Mica-reinforced polypropylene |
Aluminum |
| Woofer Surround Material |
Butyl rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Soft-Dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
2500Hz |
2500Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
214.0mm (8.4") |
303.0mm (11.9") |
| Width |
127.0mm (5") |
180.0mm (7.1") |
| Depth |
155.0mm (6.1") |
278.0mm (10.9") |
| Weight |
2.73kg (6lbs) |
5.60kg (12.3lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Meddite MDF |
MDF/Vinyl-wrapped |
| Available Colors |
Black |
Black, Walnut, White |
| Mounting Bracket |
Keyhole |
No |
| Recommended Stand Height |
28-31" |
18-24" |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
No |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |