In this review, we will be comparing Alpha S8 and DB4S, two Powered Subwoofer speakers from PSB 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 PSB Alpha S8 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 PSB Alpha S8 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.Both PSB Alpha S8and B&W DB4S have a single woofer setup however the PSB Alpha S8's woofer is 8-inch whereas the B&W DB4S features a 10-inch woofer.
Frequency Response
Alpha S8 has a frequency range of 35-150 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 Alpha S8's min frequency of 35Hz.
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
The PSB Alpha S8 has a Bass Reflex type cabinet. Bass Reflex type subwoofers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs. On the other hand the B&W DB4S have Acoustic Suspension type enclosure. 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 PSB Alpha S8's and B&W DB4S's external dimensions. PSB Alpha S8 has external dimensions of 318.0 x 293.0 x 413.0mm ( 12-1/2 x 11-1/2 x 16-1/4inch) 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 69mm wider, 57mm taller and 21mm deeper than PSB Alpha S8.
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 PSB Alpha S8 is approximately 1210.1cm2 / 187.6inch2 and base area of the B&W DB4S is approximately 1571.1cm2 / 243.5inch2. The Alpha S8 requires 23% 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 PSB Alpha S8 weighs 9.55kg / 21lbs and the B&W DB4S weighs 26.05kg / 57.3lbs. This makes the DB4S 173% heavier than the Alpha S8.
Here is a comparison of how Alpha S8 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 PSB Alpha S8?
Here are the items that are included inside the box of Alpha S8:
Powered subwooferGrille5-feet AC power cord4 Rubber feet4 Spike feet4 Hex-nutsQuick Start GuideImportant Safety InstructionsWarranty 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 |
318mm
vs
375mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1210cm2 (293x413mm)
vs
1571cm2 (362x434mm)
|
Takes less floor space |
 Price per pair* |
549USD
vs
2199USD
|
costs less (*prices may change depending on the seller, location and time) |
 Woofer Size |
10 inches
vs
8 inches
|
Larger woofer |
| Low Frequency Response |
10 Hz
vs
35 Hz
|
Generates deeper bass |
 High Frequency Response |
350k Hz
vs
150k Hz
|
Generates higher frequency |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
| General |
PSB Alpha S8 |
Bowers & Wilkins DB4S |
| Brand |
PSB |
Bowers Wilkins |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
150 watts |
1000 watts |
| Frequency Response |
35-150 Hz |
10-350 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
150-watt RMS |
0-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
10" |
| Woofer Composition |
Polypropylene |
Aerofoil |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
318.0mm (12.5") |
375.0mm (14.8") |
| Width |
293.0mm (11.5") |
362.0mm (14.3") |
| Depth |
413.0mm (16.3") |
434.0mm (17.1") |
| Weight |
9.55kg (21lbs) |
26.05kg (57.3lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
1 Year |
2 Years |
| Labor Warranty |
1 Year |
2 Years |