In this review, we will be comparing Kube 15 MIE and Kube 8 MIE, two Powered Subwoofer speakers by 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 KEF Kube 15 MIE and KEF Kube 8 MIE first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the KEF Kube 15 MIE and KEF Kube 8 MIE compare and hopefully end up with enough arguments to decide which one of these subwoofers is the better choice for you.
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Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Both KEF Kube 15 MIEand KEF Kube 8 MIE have a single woofer setup however the KEF Kube 15 MIE's woofer is 15-inch whereas the KEF Kube 8 MIE features a 8-inch woofer.
Frequency Response
Kube 15 MIE has a frequency range of 20-140 Hz whereas Kube 8 MIE has a frequency range of 34-140 Hz. With a minimum frequency of 20Hz, the Kube 15 MIE can go significantly deeper on the low side and provide stronger bass compared to the Kube 8 MIE's min frequency of 34Hz.
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 15 MIE and KEF Kube 8 MIE 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 KEF Kube 15 MIE's and KEF Kube 8 MIE's external dimensions. KEF Kube 15 MIE has external dimensions of 519 x 500 x 515 mm ( 20.4 x 19.7 x 20.3 in) whereas KEF Kube 8 MIE has external dimensions of 293 x 293 x 310 mm ( 11.5 x 11.5 x 12.2 in) .
KEF Kube 15 MIE is clearly the larger of the two speakers. Its body is 207mm wider, 226mm taller and 205mm deeper than KEF Kube 8 MIE.
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 15 MIE is approximately 2575.0cm2 / 399.1inch2 and base area of the KEF Kube 8 MIE is approximately 908.3cm2 / 140.8inch2. The Kube 15 MIE requires 183% more surface area than the Kube 8 MIE 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 15 MIE weighs 27.50kg / 60.5lbs and the KEF Kube 8 MIE weighs 9.40kg / 20.7lbs. This makes the Kube 15 MIE 193% heavier than the Kube 8 MIE.
Here is a comparison of how Kube 15 MIE and Kube 8 MIE'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 15 MIE?
Here are the items that are included inside the box of Kube 15 MIE:
Kube 15 MIE subwoofer Power cord Euroblock speaker level connector User manual and warranty information
What's in the Box of KEF Kube 8 MIE?
Here are the items that come with the Kube 8 MIE:
Kube 8 MIE subwoofer Power cord Euroblock speaker level connector User manual and warranty information
 Woofer Size |
15 inches
vs
8 inches
|
Larger woofer |
| Low Frequency Response |
20 Hz
vs
34 Hz
|
Generates deeper bass |
 Height |
293mm
vs
519mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
908cm2 (293x310mm)
vs
2575cm2 (500x515mm)
|
Takes less floor space |
 Price per pair* |
599USD
vs
1399USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF Kube 15 MIE |
KEF Kube 8 MIE |
| Brand |
KEF |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
300 watts |
| Frequency Response |
20-140 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
300-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
15" |
8" |
| Woofer Composition |
Polypropylene |
Polypropylene |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
40-140 Hz |
Physical Specs |
|
|
| Height |
519.0mm (20.4") |
293.0mm (11.5") |
| Width |
500.0mm (19.7") |
293.0mm (11.5") |
| Depth |
515.0mm (20.3") |
310.0mm (12.2") |
| Weight |
27.50kg (60.5lbs) |
9.40kg (20.7lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |