In this review, we will be comparing KUBE 8b and S 808 SUB, two Powered Subwoofer speakers from KEF and Jamo. 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 8b and Jamo S 808 SUB 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 8b and Jamo S 808 SUB 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 KUBE 8band Jamo S 808 SUB have the same driver set up: Both subwoofers have 1 x 8" drivers.
Frequency Response
KUBE 8b has a frequency range of 34-140 Hz whereas S 808 SUB has a frequency range of 39-180 Hz. With a minimum frequency of 34Hz, the KUBE 8b can go significantly deeper on the low side and provide stronger bass compared to the S 808 SUB's min frequency of 39Hz.
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 KEF KUBE 8b has a Acoustic Suspension type cabinet. 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. On the other hand the Jamo S 808 SUB have Bass Reflex type enclosure. 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.
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 8b's and Jamo S 808 SUB's external dimensions. KEF KUBE 8b has external dimensions of 294.0 x 296.0 x 339.0mm ( 11-9/16 x 11-5/8 x 13-5/16inch) whereas Jamo S 808 SUB has external dimensions of 459.0 x 178.0 x 356.0mm ( 18-1/16 x 7 x 14inch) .
KEF KUBE 8b is 165mm shorter and 17mm less deeper than Jamo S 808 SUB but it is also 118mm wider.
Below you can see the front view size comparison of KEF KUBE 8b and Jamo S 808 SUB in scale.
Comparison image of KEF KUBE 8b and Jamo S 808 SUB 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 KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2 and base area of the Jamo S 808 SUB is approximately 633.7cm2 / 98.2inch2. The KUBE 8b requires 58% more surface area than the S 808 SUB which gives it a small disadvantage 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 8b weighs 11.36kg / 25lbs and the Jamo S 808 SUB weighs 8.64kg / 19lbs. This makes the KUBE 8b 31% heavier than the S 808 SUB.
Here is a comparison of how KUBE 8b and S 808 SUB'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 8b?
Here are the items that are included inside the box of KUBE 8b:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
What's in the Box of Jamo S 808 SUB?
Here are the items that come with the S 808 SUB:
Powered subwooferGrille5-feet AC power cord6.5-feet Mono-RCA cable4 Rubber feetUser ManualImportant Safety InstructionsWarranty Information
 Low Frequency Response |
34 Hz
vs
39 Hz
|
Generates deeper bass |
 Height |
294mm
vs
459mm
|
Easier to fit in smaller spaces |
 High Frequency Response |
180k Hz
vs
140k Hz
|
Generates higher frequency |
 Base Surface Area |
633cm2 (178x356mm)
vs
1003cm2 (296x339mm)
|
Takes less floor space |
 Price per pair* |
149USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF KUBE 8b |
Jamo S 808 SUB |
| Brand |
KEF |
Jamo |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
50 watts |
| Frequency Response |
34-140 Hz |
39-180 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
50-watt RMS |
| Watts Peak (Max) |
n/a |
100-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
8" |
| Woofer Composition |
Not given |
Polyfiber |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
n/a |
| Firing Direction |
front |
Side |
Physical Specs |
|
|
| Height |
294.0mm (11.6") |
459.0mm (18.1") |
| Width |
296.0mm (11.7") |
178.0mm (7") |
| Depth |
339.0mm (13.3") |
356.0mm (14") |
| Weight |
11.36kg (25lbs) |
8.64kg (19lbs) |
| Enclosure |
Acoustic Suspension |
Bass Reflex |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |