In this review, we will be comparing KF92 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 KF92 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 KF92 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.
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Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.KEF KF92 and B&W DB4S have a totally different setup: the KEF KF92 features 2 x 9-inch drivers whereas the DB4S features 1 x 10-inch drivers.
Frequency Response
KF92 has a frequency range of 11-200 Hz whereas DB4S has a frequency range of 10-350 Hz. With a minimum frequency of 10Hz, the DB4S can go slightly deeper then the KF92's min frequency of 11Hz.
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 KF92 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 KF92's and B&W DB4S's external dimensions. KEF KF92 has external dimensions of 353.0 x 331.0 x 362.0mm ( 13-7/8 x 13 x 14-1/4inch) 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 31mm wider, 22mm taller and 72mm deeper than KEF KF92.
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 KF92 is approximately 1198.2cm2 / 185.7inch2 and base area of the B&W DB4S is approximately 1571.1cm2 / 243.5inch2. The KF92 requires 24% 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 KF92 weighs 20.05kg / 44.1lbs and the B&W DB4S weighs 26.05kg / 57.3lbs. This makes the DB4S 30% heavier than the KF92.
Here is a comparison of how KF92 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 KF92?
Here are the items that are included inside the box of KF92:
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
 Number of Woofers |
2
vs
1
|
More woofers |
 Height |
353mm
vs
375mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1198cm2 (331x362mm)
vs
1571cm2 (362x434mm)
|
Takes less floor space |
 Price per pair* |
2000USD
vs
2199USD
|
costs less (*prices may change depending on the seller, location and time) |
| Woofer Size |
10 inches
vs
9 inches
|
Larger woofer |
| Low Frequency Response |
10 Hz
vs
11 Hz
|
Generates deeper bass |
 High Frequency Response |
350k Hz
vs
200k Hz
|
Generates higher frequency |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
| General |
KEF KF92 |
Bowers & Wilkins DB4S |
| Brand |
KEF |
Bowers Wilkins |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1000 watts |
1000 watts |
| Frequency Response |
11-200 Hz |
10-350 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1000-watt RMS |
0-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
1 |
| Woofer Size |
9" |
10" |
| Woofer Composition |
Hybrid aluminum |
Aerofoil |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
353.0mm (13.9") |
375.0mm (14.8") |
| Width |
331.0mm (13") |
362.0mm (14.3") |
| Depth |
362.0mm (14.3") |
434.0mm (17.1") |
| Weight |
20.05kg (44.1lbs) |
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 |