In this review, we will be comparing Concerta B8 and KUBE 10b, two Powered Subwoofer speakers from Revel 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 Revel Concerta B8 and KEF KUBE 10b first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Revel Concerta B8 and KEF KUBE 10b 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 Revel Concerta B8and KEF KUBE 10b have a single woofer setup however the Revel Concerta B8's woofer is 8-inch whereas the KEF KUBE 10b features a 10-inch woofer.
Frequency Response
Concerta B8 has a frequency range of 45-200 Hz whereas KUBE 10b has a frequency range of 24-140 Hz. With a minimum frequency of 24Hz, the KUBE 10b can go significantly deeper on the low side and provide stronger bass compared to the Concerta B8's min frequency of 45Hz.
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 Revel Concerta B8 and KEF KUBE 10b 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 Revel Concerta B8's and KEF KUBE 10b's external dimensions. Revel Concerta B8 has external dimensions of 355.0 x 269.0 x 288.0mm ( 13-15/16 x 10-9/16 x 11-5/16inch) whereas KEF KUBE 10b has external dimensions of 372.0 x 356.0 x 397.0mm ( 14-5/8 x 14 x 15-5/8inch) .
KEF KUBE 10b is clearly the larger of the two speakers. Its body is 87mm wider, 17mm taller and 109mm deeper than Revel Concerta B8.
Below you can see the front view size comparison of Revel Concerta B8 and KEF KUBE 10b in scale.
Comparison image of Revel Concerta B8 and KEF KUBE 10b 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 Revel Concerta B8 is approximately 774.7cm2 / 120.1inch2 and base area of the KEF KUBE 10b is approximately 1413.3cm2 / 219.1inch2. The Concerta B8 requires 45% less surface area than the KUBE 10b 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 Revel Concerta B8 weighs 9.00kg / 19.8lbs and the KEF KUBE 10b weighs 17.50kg / 38.5lbs. This makes the KUBE 10b 94% heavier than the Concerta B8.
Here is a comparison of how Concerta B8 and KUBE 10b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of Revel Concerta B8?
Here are the items that are included inside the box of Concerta B8:
Wireless powered subwooferWireless transmitterAC power adapter (attached 6-feet DC cord)6-feet AC power cord16-feet Subwoofer/Trigger cable (male RCA and male minijack connector on each end) Owners ManualImportant Safety Instructions
What's in the Box of KEF KUBE 10b?
Here are the items that come with the KUBE 10b:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
 High Frequency Response |
200k Hz
vs
140k Hz
|
Generates higher frequency |
 Height |
355mm
vs
372mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
774cm2
vs
1413cm2
|
Takes less floor space |
 Woofer Size |
10 inches
vs
8 inches
|
Larger woofer |
| Low Frequency Response |
24 Hz
vs
45 Hz
|
Generates deeper bass |
| General |
Revel Concerta B8 |
KEF KUBE 10b |
| Brand |
Revel |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
200 watts |
300 watts |
| Frequency Response |
45-200 Hz |
24-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
300-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
10" |
| Woofer Composition |
Paper |
Not given |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-140 Hz |
| Firing Direction |
bottom |
front |
Physical Specs |
|
|
| Height |
355.0mm (14") |
372.0mm (14.6") |
| Width |
269.0mm (10.6") |
356.0mm (14") |
| Depth |
288.0mm (11.3") |
397.0mm (15.6") |
| Weight |
9.00kg (19.8lbs) |
17.50kg (38.5lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
5 Years |
2 Years |
| Labor Warranty |
5 Years |
2 Years |