In this review, we will be comparing PB16-Ultra and KUBE 8b, two Powered Subwoofer speakers from SVS 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 SVS PB16-Ultra 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.
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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 SVS PB16-Ultraand KEF KUBE 8b have a single woofer setup however the SVS PB16-Ultra's woofer is 16-inch whereas the KEF KUBE 8b features a 8-inch woofer.
Frequency Response
PB16-Ultra has a frequency range of 13-280 Hz whereas KUBE 8b has a frequency range of 34-140 Hz. With a minimum frequency of 13Hz, the PB16-Ultra 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 SVS PB16-Ultra 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 SVS PB16-Ultra's and KEF KUBE 8b's external dimensions. SVS PB16-Ultra has external dimensions of 635.0 x 553.0 x 788.0mm (25 x 21-3/4 x 31inch) 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).
SVS PB16-Ultra is clearly the larger of the two speakers. Its body is 257mm wider, 341mm taller and 449mm deeper than KEF KUBE 8b.
Below you can see the front view size comparison of SVS PB16-Ultra and KEF KUBE 8b in scale.
Comparison image of SVS PB16-Ultra and KEF KUBE 8b 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 SVS PB16-Ultra is approximately 4357.6cm2 / 675.4inch2 and base area of the KEF KUBE 8b is approximately 1003.4cm2 / 155.5inch2. The PB16-Ultra requires 334% more surface area than the KUBE 8b 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 SVS PB16-Ultra weighs 79.32kg / 174.5lbs and the KEF KUBE 8b weighs 11.36kg / 25lbs. This makes the PB16-Ultra 598% heavier than the KUBE 8b.
Here is a comparison of how PB16-Ultra and KUBE 8b's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of SVS PB16-Ultra?
Here are the items that are included inside the box of PB16-Ultra:
- Powered subwoofer
- Grille
- 5-feet AC power cord
- Remote control (3V battery installed)
- Owners Manual
What's in the Box of KEF KUBE 8b?
Here are the items that come with the KUBE 8b:
- Powered subwoofer
- 6.5-feet AC power cord
- Speaker-level input block
- User Manual
- Important Safety Information
- Warranty Information
 Woofer Size |
16 inches
vs
8 inches
|
Larger woofer |
| Low Frequency Response |
13 Hz
vs
34 Hz
|
Generates deeper bass |
 High Frequency Response |
280 Hz
vs
140 Hz
|
Generates higher frequency |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
 Height |
294mm
vs
635mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1003cm2
vs
4357cm2
|
Takes less floor space |
 Price per pair* |
600USD
vs
2900USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
SVS PB16-Ultra |
KEF KUBE 8b |
| Brand |
SVS |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1500 watts |
300 watts |
| Frequency Response |
13-280 Hz |
34-140 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1500-watt RMS |
300-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
16" |
8" |
| Woofer Composition |
Composite fiberglass/resin |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-140 Hz |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
635.0mm (25") |
294.0mm (11.6") |
| Width |
553.0mm (21.8") |
296.0mm (11.7") |
| Depth |
788.0mm (31") |
339.0mm (13.3") |
| Weight |
79.32kg (174.5lbs) |
11.36kg (25lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
5 Years |
2 Years |
| Labor Warranty |
5 Years |
2 Years |
A ported subwoofer against a sealed 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 | A | SVS PB16-Ultra goes deeper - 13Hz against 34Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | A | SVS PB16-Ultra has the bigger amplifier - 1500W against 300W RMS, about 7dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | SVS PB16-Ultra moves more air: 16" against 8" is 4x the cone area, not the 2x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | SVS PB16-Ultra is ported - a ported box gives more output low down for its size, at the cost of a steeper roll-off below tuning; 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. 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 | KEF KUBE 8b is about 89% 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 | A | SVS PB16-Ultra carries 5 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 | KEF KUBE 8b costs less - $600 against $2,900, about 79% less. |
A SVS PB16-Ultra B KEF KUBE 8b
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?
The usual trade-off: SVS PB16-Ultra measures better, KEF KUBE 8b costs about 79% less. In a normal room, placement will make a bigger difference than the gap between these two. Films or music? If this is mainly a home cinema, SVS PB16-Ultra 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. Two small subwoofers beat one big one in most rooms - a pair evens out the room modes in a way no single box can, whatever its specs. At $600 each, two KEF KUBE 8b cost about $1,200 against $2,900 for one of the other, which is worth a thought.
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.