In this review, we will be comparing SUB6 v2 and KUBE 8b, two Powered Subwoofer speakers from Kanto 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 Kanto SUB6 v2 and KEF KUBE 8b first before getting into our more detailed comparison.
The sections below take each area in turn: driver and amplifier, frequency response, physical size and connectivity.
Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Both Kanto SUB6 v2and KEF KUBE 8b have a single woofer setup however the Kanto SUB6 v2's woofer is 6-inch whereas the KEF KUBE 8b features a 8-inch woofer.
Frequency Response
SUB6 v2 has a frequency range of 40-175 Hz whereas KUBE 8b has a frequency range of 34-140 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 SUB6 v2's min frequency of 40Hz.
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 Kanto SUB6 v2 and KEF KUBE 8b 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
The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare Kanto SUB6 v2's and KEF KUBE 8b's external dimensions. Kanto SUB6 v2 has external dimensions of 241.0 x 220.0 x 220.0mm (9-1/2 x 8-11/16 x 8-11/16inch) 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).
KEF KUBE 8b is clearly the larger of the two speakers. Its body is 76mm wider, 53mm taller and 119mm deeper than Kanto SUB6 v2.
Size, drawn to scale
Both speakers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same surface and pushed back to the same wall, so the deeper one visibly sticks out further.
KEF KUBE 8b needs about 107% more floor or shelf area. KEF KUBE 8b is 119mm deeper, so it stands that much further out from the wall. KEF KUBE 8b is 53mm taller.
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 Kanto SUB6 v2 is approximately 484.0cm2 / 75.0inch2 and base area of the KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2. The SUB6 v2 requires 52% less surface area than the KUBE 8b 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 Kanto SUB6 v2 weighs 5.00kg / 11lbs and the KEF KUBE 8b weighs 11.36kg / 25lbs. This makes the KUBE 8b 127% heavier than the SUB6 v2.
Here is a comparison of how SUB6 v2 and KUBE 8b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 High Frequency Response |
175 Hz
vs
140 Hz
|
Generates higher frequency |
 Height |
241mm
vs
294mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
484cm2
vs
1003cm2
|
Takes less floor space |
 Price per pair* |
300USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
 Woofer Size |
8 inches
vs
6 inches
|
Larger woofer |
| Low Frequency Response |
34 Hz
vs
40 Hz
|
Generates deeper bass |
Size, drawn to scale
Both subwoofers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same floor and pushed back to the same wall, so the bigger one visibly takes more of the room.
KEF KUBE 8b needs about 107% more floor area. KEF KUBE 8b stands 119mm further into the room. KEF KUBE 8b is 53mm taller.
| General |
Kanto SUB6 v2 |
KEF KUBE 8b |
| Brand |
Kanto |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
100 watts |
300 watts |
| Frequency Response |
40-175 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
100-watt RMS |
300-watt RMS |
| Watts Peak (Max) |
200-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
6" |
8" |
| Woofer Composition |
Paper |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
Variable low pass |
40-140 Hz |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
241.0mm (9.5") |
294.0mm (11.6") |
| Width |
220.0mm (8.7") |
296.0mm (11.7") |
| Depth |
220.0mm (8.7") |
339.0mm (13.3") |
| Weight |
5.00kg (11lbs) |
11.36kg (25lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |
Two quite different sizes of subwoofer. Room volume decides this more than anything else on the page: a big driver in a small room is wasted, and a small one in a large room is worked to death.
| Area | Better | Why |
|---|
| Bass depth | B | KEF KUBE 8b goes deeper - 34Hz against 40Hz. A real difference, though most music has little content below 40Hz. |
| Amplifier power | B | KEF KUBE 8b has the bigger amplifier - 300W against 100W RMS, about 4.8dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | B | KEF KUBE 8b moves more air: 8" against 6" is 1.78x the cone area, not the 1.33x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | evenly matched | Both are sealed designs, so they roll off in much the same way. |
| Cabinet size | depends | Kanto SUB6 v2 is about 60% smaller by volume. In a subwoofer that is a real trade rather than a preference: box volume is how you get output low down without a bigger amplifier. |
| Price | A | Kanto SUB6 v2 costs less - $300 against $600, about 50% less. |
A Kanto SUB6 v2 B KEF KUBE 8b
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both subwoofers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: KEF KUBE 8b measures better, Kanto SUB6 v2 costs about 50% less. In a normal room, placement will make a bigger difference than the gap between these two. Two small subwoofers beat one big one in most rooms - a pair evens out the room modes in a way no single box can, whatever its specs. At $300 each, two Kanto SUB6 v2 cost about $600 against $600 for one of the other, which is worth a thought. If placement is the constraint - a corner, behind a sofa, under a desk - Kanto SUB6 v2 is the one that will actually go there, and a well-placed small subwoofer beats a badly-placed big one every time.
One thing outweighs everything above: where the subwoofer stands. Room modes can add or remove 10dB or more at a given seat, which is far larger than any difference on this page. Before spending more, try the sub in two or three positions - the crawl test, where you put it in the listening seat and crawl the room to find where the bass sounds best, costs nothing and usually beats an upgrade.