In this review, we will be comparing Bluesound PULSE SUB+ and KUBE 8b, two Powered Subwoofer speakers from Bluesound 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 Bluesound PULSE SUB+ and KEF KUBE 8b first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Bluesound PULSE SUB+ and KEF KUBE 8b compare and hopefully end up with enough arguments to decide which one of these subwoofers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my 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.Bluesound PULSE SUB+and KEF KUBE 8b have the same driver set up: Both subwoofers have 1 x 8" drivers.
Frequency Response
Bluesound PULSE SUB+ has a frequency range of 22-150 Hz whereas KUBE 8b has a frequency range of 34-140 Hz. With a minimum frequency of 22Hz, the Bluesound PULSE SUB+ 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
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 Bluesound PULSE SUB+'s and KEF KUBE 8b's external dimensions. Bluesound PULSE SUB+ has external dimensions of 300 x 457 x 146 mm ( ) 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) .
KEF KUBE 8b is 161mm narrower and 6mm shorter than Bluesound PULSE SUB+ but it is also 193mm 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 Bluesound PULSE SUB+ is approximately 667.2cm2 / 103.4inch2 and base area of the KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2. The Bluesound PULSE SUB+ requires 34% 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 Bluesound PULSE SUB+ weighs 8.28kg / 18.2lbs and the KEF KUBE 8b weighs 11.36kg / 25lbs. This makes the KUBE 8b 37% heavier than the Bluesound PULSE SUB+.
Here is a comparison of how Bluesound PULSE SUB+ and KUBE 8b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Low Frequency Response |
22 Hz
vs
34 Hz
|
Generates deeper bass |
 High Frequency Response |
150k Hz
vs
140k Hz
|
Generates higher frequency |
 App-Based Control |
BluOS Controller (iOS, Android)
vs
None
|
Control the speaker via an app |
 Base Surface Area |
667cm2
vs
1003cm2
|
Takes less floor space |
 Ethernet Connection |
Yes
vs
No
|
High quality streaming over Ethernet |
 Wireless Operation |
Yes
vs
No
|
Connect your subwoofer to your system wireless |
 Height |
294mm
vs
300mm
|
Easier to fit in smaller spaces |
 Price per pair* |
600USD
vs
1149USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Bluesound PULSE SUB+ |
KEF KUBE 8b |
| Brand |
Bluesound |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Frequency Response |
22-150 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
150-watt RMS |
300-watt RMS |
| Watts Peak (Max) |
200-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
8" |
| Woofer Composition |
Polypropylene |
|
| Woofer Surround Material |
Rubber |
n/a |
| 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 |
300.0mm (11.8") |
294.0mm (11.6") |
| Width |
457.0mm (18") |
296.0mm (11.7") |
| Depth |
146.0mm (5.7") |
339.0mm (13.3") |
| Weight |
8.28kg (18.2lbs) |
11.36kg (25lbs) |
| Enclosure |
|
Acoustic Suspension |
| Finish |
Matte |
n/a |
| Available Colors |
Black, White |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| USB Port |
Type A (upgrade only), Type B mini (service) |
n/a |
| Ethernet Port |
Yes |
n/a |
Other |
|
|
| Parts Warranty |
|
2 Years |
| Labor Warranty |
|
2 Years |