In this review, we will be comparing Gravis V and KUBE 10b, two Powered Subwoofer speakers from Sonus faber 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 Sonus faber Gravis V 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 Sonus faber Gravis V 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.
**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.Both Sonus faber Gravis Vand KEF KUBE 10b have a single woofer setup however the Sonus faber Gravis V's woofer is 12.5-inch whereas the KEF KUBE 10b features a 10-inch woofer.
Frequency Response
Gravis V has a frequency range of 20-120 Hz whereas KUBE 10b has a frequency range of 24-140 Hz. With a minimum frequency of 20Hz, the Gravis V can go slightly deeper then the KUBE 10b's min frequency of 24Hz.
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 Sonus faber Gravis V 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 Sonus faber Gravis V's and KEF KUBE 10b's external dimensions. Sonus faber Gravis V has external dimensions of 455.0 x 448.0 x 448.0mm ( 17-15/16 x 17-5/8 x 17-5/8inch) 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) .
Sonus faber Gravis V is clearly the larger of the two speakers. Its body is 92mm wider, 83mm taller and 51mm deeper than KEF KUBE 10b.
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 Sonus faber Gravis V is approximately 2007.0cm2 / 311.1inch2 and base area of the KEF KUBE 10b is approximately 1413.3cm2 / 219.1inch2. The Gravis V requires 42% more surface area than the KUBE 10b 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 Sonus faber Gravis V weighs 32.00kg / 70.4lbs and the KEF KUBE 10b weighs 17.50kg / 38.5lbs. This makes the Gravis V 83% heavier than the KUBE 10b.
Here is a comparison of how Gravis V and KUBE 10b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
12.5 inches
vs
10 inches
|
Larger woofer |
| Low Frequency Response |
20 Hz
vs
24 Hz
|
Generates deeper bass |
 High Frequency Response |
140k Hz
vs
120k Hz
|
Generates higher frequency |
 Height |
372mm
vs
455mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1413cm2
vs
2007cm2
|
Takes less floor space |
| General |
Sonus faber Gravis V |
KEF KUBE 10b |
| Brand |
Sonus faber |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
850 watts |
300 watts |
| Frequency Response |
20-120 Hz |
24-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
850-watt RMS |
300-watt RMS |
| Watts Peak (Max) |
1200-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
12.5" |
10" |
| Woofer Composition |
Honeycomb sandwich |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
Continuously adjustable |
40-140 Hz |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
455.0mm (17.9") |
372.0mm (14.6") |
| Width |
448.0mm (17.6") |
356.0mm (14") |
| Depth |
448.0mm (17.6") |
397.0mm (15.6") |
| Weight |
32.00kg (70.4lbs) |
17.50kg (38.5lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
|
2 Years |
| Labor Warranty |
|
2 Years |