In this review, we will be comparing SuperSub XXL and KUBE 8b, two Powered Subwoofer speakers from GoldenEar and KEF. 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 GoldenEar SuperSub XXL and KEF KUBE 8b first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the GoldenEar SuperSub XXL and KEF KUBE 8b 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.GoldenEar SuperSub XXL and KEF KUBE 8b have a totally different setup: the GoldenEar SuperSub XXL features 2 x 12-inch drivers whereas the KUBE 8b features 1 x 8-inch drivers.
Frequency Response
SuperSub XXL has a frequency range of 10-250 Hz whereas KUBE 8b has a frequency range of 34-140 Hz. With a minimum frequency of 10Hz, the SuperSub XXL can go significantly deeper on the low side and provide stronger bass compared to the KUBE 8b's min frequency of 34Hz.
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 GoldenEar SuperSub XXL has a Passive Radiator type cabinet. Passive Radiator type subwoofers sports a non-powered cone that moves in response to the main woofer to move air out in order to generate stronger bass in a smaller body compared to ported or sealed designs. On the other hand the KEF KUBE 8b 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 GoldenEar SuperSub XXL's and KEF KUBE 8b's external dimensions. GoldenEar SuperSub XXL has external dimensions of 447.0 x 485.0 x 434.0mm ( 17-9/16inch x 19-1/16inch x 17-1/16inch ) whereas 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) .
GoldenEar SuperSub XXL is clearly the larger of the two speakers. Its body is 189mm wider, 153mm taller and 95mm deeper than KEF KUBE 8b.
Below you can see the front view size comparison of GoldenEar SuperSub XXL and KEF KUBE 8b in scale.
Comparison image of GoldenEar SuperSub XXL and KEF KUBE 8b 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 GoldenEar SuperSub XXL is approximately 2104.9cm2 / 326.3inch2 and base area of the KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2. The SuperSub XXL requires 110% more surface area than the KUBE 8b 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 GoldenEar SuperSub XXL weighs 37.27kg / 82lbs and the KEF KUBE 8b weighs 11.36kg / 25lbs. This makes the SuperSub XXL 228% heavier than the KUBE 8b.
Here is a comparison of how SuperSub XXL and KUBE 8b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of GoldenEar SuperSub XXL?
Here are the items that are included inside the box of SuperSub XXL:
Powered Subwoofer10-feet AC power cordOwners Manual
What's in the Box of KEF KUBE 8b?
Here are the items that come with the KUBE 8b:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
 Woofer Size |
12 inches
vs
8 inches
|
Larger woofer |
| Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
10 Hz
vs
34 Hz
|
Generates deeper bass |
 High Frequency Response |
250k Hz
vs
140k Hz
|
Generates higher frequency |
 Passive Radiator |
two 13-inch x 15-inch
vs
None
|
Increases the bass performance |
 Height |
294mm
vs
447mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1003cm2
vs
2104cm2
|
Takes less floor space |
 Price per pair* |
600USD
vs
2499USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
GoldenEar SuperSub XXL |
KEF KUBE 8b |
| Brand |
GoldenEar |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1600 watts |
300 watts |
| Frequency Response |
10-250 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1600-watt RMS |
300-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
1 |
| Woofer Size |
12" |
8" |
| Woofer Composition |
Fiber |
Not given |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-140 Hz |
| Firing Direction |
side |
front |
Physical Specs |
|
|
| Height |
447.0mm (17.6") |
294.0mm (11.6") |
| Width |
485.0mm (19.1") |
296.0mm (11.7") |
| Depth |
434.0mm (17.1") |
339.0mm (13.3") |
| Weight |
37.27kg (82lbs) |
11.36kg (25lbs) |
| Enclosure |
Passive Radiator |
Acoustic Suspension |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
3 Years |
2 Years |
| Labor Warranty |
3 Years |
2 Years |