In this review, we will be comparing KUBE 10b and Sub 1000 F, two Powered Subwoofer speakers from KEF and Focal. 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 10b and Focal Sub 1000 F 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 KEF KUBE 10band Focal Sub 1000 F have a single woofer setup however the KEF KUBE 10b's woofer is 10-inch whereas the Focal Sub 1000 F features a 12-inch woofer.
Frequency Response
KUBE 10b has a frequency range of 24-140 Hz whereas Sub 1000 F has a frequency range of 24-200 Hz.
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 KEF KUBE 10b and Focal Sub 1000 F 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 KEF KUBE 10b's and Focal Sub 1000 F's external dimensions. KEF KUBE 10b has external dimensions of 372.0 x 356.0 x 397.0mm (14-5/8 x 14 x 15-5/8inch) whereas Focal Sub 1000 F has external dimensions of 421.0 x 401.0 x 474.0mm (16-9/16 x 15-3/4 x 18-5/8inch).
Focal Sub 1000 F is clearly the larger of the two speakers. Its body is 45mm wider, 49mm taller and 77mm 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 KEF KUBE 10b is approximately 1413.3cm2 / 219.1inch2 and base area of the Focal Sub 1000 F is approximately 1900.7cm2 / 294.6inch2. The KUBE 10b requires 26% less surface area than the Sub 1000 F 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 KEF KUBE 10b weighs 17.50kg / 38.5lbs and the Focal Sub 1000 F weighs 21.36kg / 47lbs. This makes the Sub 1000 F 22% heavier than the KUBE 10b.
Here is a comparison of how KUBE 10b and Sub 1000 F'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 10b?
Here are the items that are included inside the box of KUBE 10b:
- Powered subwoofer
- 6.5-feet AC power cord
- Speaker-level input block
- User Manual
- Important Safety Information
- Warranty Information
What's in the Box of Focal Sub 1000 F?
Here are the items that come with the Sub 1000 F:
- Powered subwoofer
- 8-feet AC power cord
- Grille
- User Manual
 Height |
372mm
vs
421mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1413cm2
vs
1900cm2
|
Takes less floor space |
 Price per pair* |
750USD
vs
2099USD
|
costs less (*prices may change depending on the seller, location and time) |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
 Woofer Size |
12 inches
vs
10 inches
|
Larger woofer |
 High Frequency Response |
200 Hz
vs
140 Hz
|
Generates higher frequency |
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.
Focal Sub 1000 F needs about 34% more floor area. Focal Sub 1000 F stands 77mm further into the room. Focal Sub 1000 F is 49mm taller.
| General |
KEF KUBE 10b |
Focal Sub 1000 F |
| Brand |
KEF |
Focal |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
1000 watts |
| Frequency Response |
24-140 Hz |
24-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
1000-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
10" |
12" |
| Woofer Composition |
|
Flax |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
n/a |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
372.0mm (14.6") |
421.0mm (16.6") |
| Width |
356.0mm (14") |
401.0mm (15.8") |
| Depth |
397.0mm (15.6") |
474.0mm (18.7") |
| Weight |
17.50kg (38.5lbs) |
21.36kg (47lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
3 Years |
| Labor Warranty |
2 Years |
3 Years |
Different price classes - Focal Sub 1000 F costs roughly 2.8x what KEF KUBE 10b does. Before paying it, read the note below about two smaller subwoofers.
| Area | Better | Why |
|---|
| Bass depth | evenly matched | Effectively the same reach (24Hz vs 24Hz). |
| Amplifier power | B | Focal Sub 1000 F has the bigger amplifier - 1000W against 300W RMS, about 5.2dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | B | Focal Sub 1000 F moves more air: 12" against 10" is 1.44x the cone area, not the 1.2x 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. |
| Wireless option | depends | Only KEF KUBE 10b offers a wireless link (as a paid option). It decides where the sub can go if you cannot run a cable, and is worth nothing if you can. |
| Cabinet size | depends | KEF KUBE 10b is about 34% 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. |
| Warranty | B | Focal Sub 1000 F carries 3 years on parts against 2 years. A subwoofer amplifier works harder than anything else in the system, so this is not a throwaway line. |
| Price | A | KEF KUBE 10b costs less - $750 against $2,099, about 64% less. |
A KEF KUBE 10b B Focal Sub 1000 F
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: Focal Sub 1000 F measures better, KEF KUBE 10b costs about 64% 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 $750 each, two KEF KUBE 10b cost about $1,500 against $2,099 for one of the other, which is worth a thought. If placement is the constraint - a corner, behind a sofa, under a desk - KEF KUBE 10b 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.