In this review, we will be comparing Kube 10 MIE and R-121SW, two Powered Subwoofer speakers from KEF and Klipsch. 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 10 MIE and Klipsch R-121SW 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 10 MIE and Klipsch R-121SW 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 10 MIEand Klipsch R-121SW have a single woofer setup however the KEF Kube 10 MIE's woofer is 10-inch whereas the Klipsch R-121SW features a 12-inch woofer.
Frequency Response
Kube 10 MIE has a frequency range of 20-140 Hz whereas R-121SW has a frequency range of 28-120 Hz. With a minimum frequency of 20Hz, the Kube 10 MIE can go significantly deeper on the low side and provide stronger bass compared to the R-121SW's min frequency of 28Hz.
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 KEF Kube 10 MIE 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 Klipsch R-121SW have Bass Reflex type enclosure. 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.
Klipsch R-121SW Port
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 10 MIE's and Klipsch R-121SW's external dimensions. KEF Kube 10 MIE has external dimensions of 370 x 353 x 370 mm ( 14.6 x 13.9 x 14.6 in) whereas Klipsch R-121SW has external dimensions of 423.0 x 407.0 x 532.0mm ( 16-5/8inch x 16inch x 20-15/16inch ) .
Klipsch R-121SW is clearly the larger of the two speakers. Its body is 54mm wider, 53mm taller and 162mm deeper than KEF Kube 10 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 10 MIE is approximately 1306.1cm2 / 202.4inch2 and base area of the Klipsch R-121SW is approximately 2165.2cm2 / 335.6inch2. The Kube 10 MIE requires 40% less surface area than the R-121SW 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 10 MIE weighs 15.40kg / 33.9lbs and the Klipsch R-121SW weighs 16.00kg / 35.2lbs. This makes the R-121SW 4% heavier than the Kube 10 MIE.
Here is a comparison of how Kube 10 MIE and R-121SW'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 10 MIE?
Here are the items that are included inside the box of Kube 10 MIE:
Kube 10 MIE subwoofer Power cord Euroblock speaker level connector User manual and warranty information
What's in the Box of Klipsch R-121SW?
Here are the items that come with the R-121SW:
Powered subwooferGrille6.5-feet AC power cordUser ManualImportant Safety InstructionsWarranty Information
 Low Frequency Response |
20 Hz
vs
28 Hz
|
Generates deeper bass |
 High Frequency Response |
140k Hz
vs
120k Hz
|
Generates higher frequency |
 Height |
370mm
vs
423mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1306cm2 (353x370mm)
vs
2165cm2 (407x532mm)
|
Takes less floor space |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
| Woofer Size |
12 inches
vs
10 inches
|
Larger woofer |
 Price per pair* |
599USD
vs
799USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF Kube 10 MIE |
Klipsch Reference R-121SW |
| Brand |
KEF |
Klipsch |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
200 watts |
| Frequency Response |
20-140 Hz |
28-120 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
200-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
10" |
12" |
| Woofer Composition |
Polypropylene |
Spun-Copper TCP |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-140 Hz |
n/a |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
370.0mm (14.6") |
423.0mm (16.7") |
| Width |
353.0mm (13.9") |
407.0mm (16") |
| Depth |
370.0mm (14.6") |
532.0mm (20.9") |
| Weight |
15.40kg (33.9lbs) |
16.00kg (35.2lbs) |
| Enclosure |
Acoustic Suspension |
Bass Reflex |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |