In this review, we will be comparing Defiance X15 and KUBE 10b, two Powered Subwoofer speakers from Paradigm 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 Paradigm Defiance X15 and KEF KUBE 10b 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 Paradigm Defiance X15and KEF KUBE 10b have a single woofer setup however the Paradigm Defiance X15's woofer is 15-inch whereas the KEF KUBE 10b features a 10-inch woofer.
Frequency Response
Defiance X15 has a frequency range of 18-230 Hz whereas KUBE 10b has a frequency range of 24-140 Hz. With a minimum frequency of 18Hz, the Defiance X15 can go significantly deeper on the low side and provide stronger bass compared to 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
The Paradigm Defiance X15 has a Bass Reflex type cabinet. Bass Reflex type subwoofers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs. On the other hand the KEF KUBE 10b 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
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 Paradigm Defiance X15's and KEF KUBE 10b's external dimensions. Paradigm Defiance X15 has external dimensions of 626.0 x 589.0 x 661.0mm (24-5/8inch x 23-3/16inch x 26inch) 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).
Paradigm Defiance X15 is clearly the larger of the two speakers. Its body is 233mm wider, 254mm taller and 264mm deeper than KEF KUBE 10b.
Below you can see the front view size comparison of Paradigm Defiance X15 and KEF KUBE 10b in scale.
Comparison image of Paradigm Defiance X15 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 Paradigm Defiance X15 is approximately 3893.3cm2 / 603.5inch2 and base area of the KEF KUBE 10b is approximately 1413.3cm2 / 219.1inch2. The Defiance X15 requires 175% 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 Paradigm Defiance X15 weighs 41.82kg / 92lbs and the KEF KUBE 10b weighs 17.50kg / 38.5lbs. This makes the Defiance X15 139% heavier than the KUBE 10b.
Here is a comparison of how Defiance X15 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 Paradigm Defiance X15?
Here are the items that are included inside the box of Defiance X15:
- Powered subwoofer
- Grille
- 6-feetAC power cord
- ARC microphone
- 12
What's in the Box of KEF KUBE 10b?
Here are the items that come with the KUBE 10b:
- Powered subwoofer
- 6.5-feet AC power cord
- Speaker-level input block
- User Manual
- Important Safety Information
- Warranty Information
 Woofer Size |
15 inches
vs
10 inches
|
Larger woofer |
| Low Frequency Response |
18 Hz
vs
24 Hz
|
Generates deeper bass |
 High Frequency Response |
230 Hz
vs
140 Hz
|
Generates higher frequency |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
 Height |
372mm
vs
626mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1413cm2
vs
3893cm2
|
Takes less floor space |
 Price per pair* |
750USD
vs
1999USD
|
costs less (*prices may change depending on the seller, location and time) |
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.
Paradigm Defiance X15 needs about 175% more floor area. Paradigm Defiance X15 stands 264mm further into the room. Paradigm Defiance X15 is 254mm taller.
| General |
Paradigm Defiance X15 |
KEF KUBE 10b |
| Brand |
Paradigm |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
90 watts |
300 watts |
| Frequency Response |
18-230 Hz |
24-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
90-watt RMS |
300-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
15" |
10" |
| Woofer Composition |
Carbon-loaded polypropylene |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-140 Hz |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
626.0mm (24.6") |
372.0mm (14.6") |
| Width |
589.0mm (23.2") |
356.0mm (14") |
| Depth |
661.0mm (26") |
397.0mm (15.6") |
| Weight |
41.82kg (92lbs) |
17.50kg (38.5lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
3 Years |
2 Years |
| Labor Warranty |
3 Years |
2 Years |
A ported subwoofer against a sealed one. That is the most consequential line on this page: it decides how the bass rolls off, how it behaves in a small room, and how much output you get for the size of the box.
| Area | Better | Why |
|---|
| Bass depth | A | Paradigm Defiance X15 goes deeper - 18Hz against 24Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | B | KEF KUBE 10b has the bigger amplifier - 300W against 90W RMS, about 5.2dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | Paradigm Defiance X15 moves more air: 15" against 10" is 2.25x the cone area, not the 1.5x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | Paradigm Defiance X15 is ported - a ported box gives more output low down for its size, at the cost of a steeper roll-off below tuning; KEF KUBE 10b is sealed - a sealed box rolls off gently and is usually the easier one to integrate in a small or awkward room. Neither is better in the abstract; ported tends to suit films and sealed tends to suit music, and both generalisations have exceptions. |
| Speaker-level inputs | A | Paradigm Defiance X15 takes a speaker-level connection as well as line level. That is what lets it work with an integrated amplifier or a vintage receiver that has no subwoofer output at all. |
| Cabinet size | depends | KEF KUBE 10b is about 78% 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 | A | Paradigm Defiance X15 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 | B | KEF KUBE 10b costs less - $750 against $1,999, about 62% less. |
A Paradigm Defiance X15 B KEF KUBE 10b
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: Paradigm Defiance X15 measures better, KEF KUBE 10b costs about 62% less. In a normal room, placement will make a bigger difference than the gap between these two. Films or music? If this is mainly a home cinema, Paradigm Defiance X15 will hit harder for the money; if it is mainly for music in a normal-sized room, KEF KUBE 10b is usually the easier one to make sound right. Check your amplifier first: if it has no subwoofer or preamp output, Paradigm Defiance X15 is the only one of these two you can connect at all.
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.