In this review, we will be comparing NS-SW050 and KUBE 8b, two Powered Subwoofer speakers from Yamaha 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 Yamaha NS-SW050 and KEF KUBE 8b 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.
**This post contains affiliate links, and we will be compensated if you make a purchase after clicking through our links. As an Amazon Associate I earn from qualifying purchases.
Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Yamaha NS-SW050and KEF KUBE 8b have the same driver set up: Both subwoofers have 1 x 8" drivers.
Frequency Response
NS-SW050 has a frequency range of 28-200 Hz whereas KUBE 8b has a frequency range of 34-140 Hz. With a minimum frequency of 28Hz, the NS-SW050 can go significantly deeper on the low side and provide stronger bass compared to the KUBE 8b'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
The Yamaha NS-SW050 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 8b 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 Yamaha NS-SW050's and KEF KUBE 8b's external dimensions. Yamaha NS-SW050 has external dimensions of 292.1 x 292.1 x 339.7mm (11.5 x 11.5 x 13.375inch) whereas 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).
Yamaha NS-SW050 is 3.9mm narrower and 1.9mm shorter than KEF KUBE 8b but it is also 0.69999999999999mm deeper.
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 Yamaha NS-SW050 is approximately 992.3cm2 / 153.8inch2 and base area of the KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2. The NS-SW050 requires 1% less surface area than the KUBE 8b 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 Yamaha NS-SW050 weighs 8.48kg / 18.7lbs and the KEF KUBE 8b weighs 11.36kg / 25lbs. This makes the KUBE 8b 34% heavier than the NS-SW050.
Here is a comparison of how NS-SW050 and KUBE 8b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Low Frequency Response |
28 Hz
vs
34 Hz
|
Generates deeper bass |
 High Frequency Response |
200k Hz
vs
140k Hz
|
Generates higher frequency |
 Height |
292mm
vs
294mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
992cm2
vs
1003cm2
|
Takes less floor space |
 Price per pair* |
220USD
vs
600USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Yamaha NS-SW050 |
KEF KUBE 8b |
| Brand |
Yamaha |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
50 watts |
300 watts |
| Frequency Response |
28-200 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
50-watt RMS |
300-watt RMS |
| Watts Peak (Max) |
100-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
8" |
| Woofer Composition |
Cone |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-140 Hz |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
292.1mm (11.5") |
294.0mm (11.6") |
| Width |
292.1mm (11.5") |
296.0mm (11.7") |
| Depth |
339.7mm (13.4") |
339.0mm (13.3") |
| Weight |
8.48kg (18.7lbs) |
11.36kg (25lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
|
2 Years |
| Labor Warranty |
|
2 Years |