In this review, we will be comparing KUBE 8b and Minx X201, two Powered Subwoofer speakers from KEF and Cambridge Audio. 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 8b and Cambridge Audio Minx X201 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 8band Cambridge Audio Minx X201 have a single woofer setup however the KEF KUBE 8b's woofer is 8-inch whereas the Cambridge Audio Minx X201 features a 6.5-inch woofer.
Frequency Response
KUBE 8b has a frequency range of 34-140 Hz whereas Minx X201 has a frequency range of 36-200 Hz. With a minimum frequency of 34Hz, the KUBE 8b can go slightly deeper then the Minx X201's min frequency of 36Hz.
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
Cambridge Audio Minx X201
High Frequency
Subwoofer Speakers
Cambridge Audio Minx X201
Cabinet Type
The KEF KUBE 8b has a Acoustic Suspension type cabinet. 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. On the other hand the Cambridge Audio Minx X201 have Passive Radiator type enclosure. Passive Radiator type subwoofers sports a non-powered cone that moves in response to the main woofer to move air out in order to generate stronger bass in a smaller body compared to ported or sealed 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 8b's and Cambridge Audio Minx X201's external dimensions. 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) whereas Cambridge Audio Minx X201 has external dimensions of 220.0 x 210.0 x 256.0mm (8-5/8 x 8-1/4 x 10-1/16inch).
KEF KUBE 8b is clearly the larger of the two speakers. Its body is 86mm wider, 74mm taller and 83mm deeper than Cambridge Audio Minx X201.
Below you can see the front view size comparison of KEF KUBE 8b and Cambridge Audio Minx X201 in scale.
Comparison image of KEF KUBE 8b and Cambridge Audio Minx X201 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 KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2 and base area of the Cambridge Audio Minx X201 is approximately 537.6cm2 / 83.3inch2. The KUBE 8b requires 87% more surface area than the Minx X201 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 KEF KUBE 8b weighs 11.36kg / 25lbs and the Cambridge Audio Minx X201 weighs 5.00kg / 11lbs. This makes the KUBE 8b 127% heavier than the Minx X201.
Here is a comparison of how KUBE 8b and Minx X201's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
Cambridge Audio Minx X201
What's in the Box of KEF KUBE 8b?
Here are the items that are included inside the box of KUBE 8b:
- 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 Cambridge Audio Minx X201?
Here are the items that come with the Minx X201:
- Powered subwoofer
- Grille (installed)
- 6-feet AC power cord
- Installation Guide
- Important Safety Instructions
 Woofer Size |
8 inches
vs
6.5 inches
|
Larger woofer |
| Low Frequency Response |
34 Hz
vs
36 Hz
|
Generates deeper bass |
 High Frequency Response |
200 Hz
vs
140 Hz
|
Generates higher frequency |
 Passive Radiator |
two 6.5-inch
vs
None
|
Increases the bass performance |
 Height |
220mm
vs
294mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
537cm2
vs
1003cm2
|
Takes less floor space |
 Price per pair* |
449USD
vs
600USD
|
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.
KEF KUBE 8b needs about 87% more floor area. KEF KUBE 8b stands 83mm further into the room. KEF KUBE 8b is 74mm taller.
| General |
KEF KUBE 8b |
Cambridge Audio Minx X201 |
| Brand |
KEF |
Cambridge Audio |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
200 watts |
| Frequency Response |
34-140 Hz |
36-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
200-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
6.5" |
| Woofer Composition |
|
Aluminum |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
n/a |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
294.0mm (11.6") |
220.0mm (8.7") |
| Width |
296.0mm (11.7") |
210.0mm (8.3") |
| Depth |
339.0mm (13.3") |
256.0mm (10.1") |
| Weight |
11.36kg (25lbs) |
5.00kg (11lbs) |
| Enclosure |
Acoustic Suspension |
Passive Radiator |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
3 Years |
| Labor Warranty |
2 Years |
3 Years |
A sealed subwoofer against a passive radiator 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 | evenly matched | Effectively the same reach (34Hz vs 36Hz). |
| Amplifier power | A | KEF KUBE 8b has the bigger amplifier - 300W against 200W RMS, about 1.8dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | KEF KUBE 8b moves more air: 8" against 6.5" is 1.51x the cone area, not the 1.23x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | KEF KUBE 8b is sealed - a sealed box rolls off gently and is usually the easier one to integrate in a small or awkward room; Cambridge Audio Minx X201 is passive radiator - a passive radiator behaves like a port without the pipe noise, and suits a slim cabinet. Neither is better in the abstract; ported tends to suit films and sealed tends to suit music, and both generalisations have exceptions. |
| Cabinet size | depends | Cambridge Audio Minx X201 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. |
| Warranty | B | Cambridge Audio Minx X201 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 | Cambridge Audio Minx X201 costs less - $449 against $600, about 25% less. |
A KEF KUBE 8b B Cambridge Audio Minx X201
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?
KEF KUBE 8b is ahead, but on only 1 of the measured areas, and it costs about 34% more. Cambridge Audio Minx X201 is the sensible buy unless your room is large enough to need the extra. Films or music? If this is mainly a home cinema, Cambridge Audio Minx X201 will hit harder for the money; if it is mainly for music in a normal-sized room, KEF KUBE 8b is usually the easier one to make sound right. If placement is the constraint - a corner, behind a sofa, under a desk - Cambridge Audio Minx X201 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.