In this review, we will be comparing KUBE 10b and DB4S, two Powered Subwoofer speakers from KEF and Bowers Wilkins. Being Powered subwoofers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features of KEF KUBE 10b and B&W DB4S first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the KEF KUBE 10b and B&W DB4S compare and hopefully end up with enough arguments to decide which one of these subwoofers 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
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.KEF KUBE 10band B&W DB4S have the same driver set up: Both subwoofers have 1 x 10" drivers.
Frequency Response
KUBE 10b has a frequency range of 24-140 Hz whereas DB4S has a frequency range of 10-350 Hz. With a minimum frequency of 10Hz, the DB4S can go significantly deeper on the low side and provide stronger bass compared to the KUBE 10b's min frequency of 24Hz.
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 Subwoofer class in our database.
Low Frequency
Subwoofer Speakers
High Frequency
Subwoofer Speakers
Cabinet Type
Both KEF KUBE 10b and B&W DB4S have Acoustic Suspension type cabinets. Acoustic Suspension aka Sealed type subwoofers have enclosures that are sealed hence no ports or holes exists on the cabinet. Sealed designs helps to provide more accurate and tight bass responses compared to ported designs.
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 KUBE 10b's and B&W DB4S's external dimensions. KEF KUBE 10b has external dimensions of 372.0 x 356.0 x 397.0mm ( 14-5/8 x 14 x 15-5/8inch) whereas B&W DB4S has external dimensions of 375.0 x 362.0 x 434.0mm ( 14-3/4 x 14-1/4 x 17-1/16inch) .
B&W DB4S is clearly the larger of the two speakers. Its body is 6mm wider, 3mm taller and 37mm deeper than KEF KUBE 10b.
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 KUBE 10b is approximately 1413.3cm2 / 219.1inch2 and base area of the B&W DB4S is approximately 1571.1cm2 / 243.5inch2. The KUBE 10b requires 10% less surface area than the DB4S which gives it a small advantage on placement in tight spaces.
Weight Comparison The weight of a subwoofer may become an important factor if you need to move and reposition the unit often to find the optimal positioning, also known as 'Subwoofer Crawling'. The KEF KUBE 10b weighs 17.50kg / 38.5lbs and the B&W DB4S weighs 26.05kg / 57.3lbs. This makes the DB4S 49% heavier than the KUBE 10b.
Here is a comparison of how KUBE 10b and DB4S's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of KEF KUBE 10b?
Here are the items that are included inside the box of KUBE 10b:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
What's in the Box of B&W DB4S?
Here are the items that come with the DB4S:
Powered subwooferGrille6.5-feet AC power cord4 Decoupling feet4 Rubber feet4 Spike feet4 Lock-nutsCleaning clothQuickstart GuideBowers & Wilkins brochureWarranty InformationCleaning cloth instructions
 Height |
372mm
vs
375mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1413cm2 (356x397mm)
vs
1571cm2 (362x434mm)
|
Takes less floor space |
 Price per pair* |
750USD
vs
2199USD
|
costs less (*prices may change depending on the seller, location and time) |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
 Low Frequency Response |
10 Hz
vs
24 Hz
|
Generates deeper bass |
 High Frequency Response |
350k Hz
vs
140k Hz
|
Generates higher frequency |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
| General |
KEF KUBE 10b |
Bowers & Wilkins DB4S |
| Brand |
KEF |
Bowers Wilkins |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
1000 watts |
| Frequency Response |
24-140 Hz |
10-350 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
0-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
10" |
10" |
| Woofer Composition |
Not given |
Aerofoil |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
n/a |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
372.0mm (14.6") |
375.0mm (14.8") |
| Width |
356.0mm (14") |
362.0mm (14.3") |
| Depth |
397.0mm (15.6") |
434.0mm (17.1") |
| Weight |
17.50kg (38.5lbs) |
26.05kg (57.3lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |