In this review, we will be comparing KC62 and PB-4000, two Powered Subwoofer speakers from KEF and SVS. 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 KC62 and SVS PB-4000 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.KEF KC62 and SVS PB-4000 have a totally different setup: the KEF KC62 features 2 x 6.5-inch drivers whereas the PB-4000 features 1 x 13.5-inch drivers.
Frequency Response
KC62 has a frequency range of 11-200 Hz whereas PB-4000 has a frequency range of 16-200 Hz. With a minimum frequency of 11Hz, the KC62 can go significantly deeper on the low side and provide stronger bass compared to the PB-4000's min frequency of 16Hz.
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 KC62 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 SVS PB-4000 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.
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 KEF KC62's and SVS PB-4000's external dimensions. KEF KC62 has external dimensions of 245.0 x 258.0 x 281.0mm (9-5/8inch x 10-1/8inch x 11-1/16inch) whereas SVS PB-4000 has external dimensions of 596.0 x 521.0 x 762.0mm (23-7/16 x 20-1/2 x 30inch).
SVS PB-4000 is clearly the larger of the two speakers. Its body is 263mm wider, 351mm taller and 481mm deeper than KEF KC62.
Below you can see the front view size comparison of KEF KC62 and SVS PB-4000 in scale.
Comparison image of KEF KC62 and SVS PB-4000 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 KEF KC62 is approximately 725.0cm2 / 112.4inch2 and base area of the SVS PB-4000 is approximately 3970.0cm2 / 615.4inch2. The KC62 requires 82% less surface area than the PB-4000 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 KC62 weighs 14.05kg / 30.9lbs and the SVS PB-4000 weighs 69.64kg / 153.2lbs. This makes the PB-4000 396% heavier than the KC62.
Here is a comparison of how KC62 and PB-4000'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 KC62?
Here are the items that are included inside the box of KC62:
- Powered subwoofer
- 6.5-feet AC power cord
- Speaker-level input block
- User Manual
- Important Safety Information
- Warranty Information
What's in the Box of SVS PB-4000?
Here are the items that come with the PB-4000:
- Powered subwoofer
- Grille
- 6-feet AC power cord
- Remote control
- 4 Elastomer feet
- Owners Manual
- Important Safety Instructions
 Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
11 Hz
vs
16 Hz
|
Generates deeper bass |
 Height |
245mm
vs
596mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
725cm2
vs
3970cm2
|
Takes less floor space |
 Price per pair* |
1500USD
vs
2300USD
|
costs less (*prices may change depending on the seller, location and time) |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
| Woofer Size |
13.5 inches
vs
6.5 inches
|
Larger woofer |
 Handheld Remote |
Yes
vs
No
|
Control the speaker by the included RC |
 App-Based Control |
iOS,Android
vs
None
|
Control the speaker via an app |
| General |
KEF KC62 |
SVS PB-4000 |
| Brand |
KEF |
SVS |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1000 watts |
1200 watts |
| Frequency Response |
11-200 Hz |
16-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1000-watt RMS |
1200-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
1 |
| Woofer Size |
6.5" |
13.5" |
| Woofer Composition |
|
Composite/Glass Fiber |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
side |
front |
Physical Specs |
|
|
| Height |
245.0mm (9.6") |
596.0mm (23.5") |
| Width |
258.0mm (10.2") |
521.0mm (20.5") |
| Depth |
281.0mm (11.1") |
762.0mm (30") |
| Weight |
14.05kg (30.9lbs) |
69.64kg (153.2lbs) |
| Enclosure |
Acoustic Suspension |
Bass Reflex |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
5 Years |
| Labor Warranty |
2 Years |
5 Years |
A sealed subwoofer against a ported 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 | KEF KC62 goes deeper - 11Hz against 16Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | evenly matched | Much the same amplifier (1000W vs 1200W RMS) - under 1dB apart. |
| Driver area | B | SVS PB-4000 moves more air: 13.5" against 2 x 6.5" is 2.16x the cone area, not the 1.47x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | KEF KC62 is sealed - a sealed box rolls off gently and is usually the easier one to integrate in a small or awkward room; SVS PB-4000 is ported - a ported box gives more output low down for its size, at the cost of a steeper roll-off below tuning. Neither is better in the abstract; ported tends to suit films and sealed tends to suit music, and both generalisations have exceptions. |
| Speaker-level inputs | A | KEF KC62 takes a speaker-level connection as well as line level. That is what lets it work with an integrated amplifier or a vintage receiver that has no subwoofer output at all. |
| Wireless option | depends | Only KEF KC62 offers a wireless link (as a paid option). It decides where the sub can go if you cannot run a cable, and is worth nothing if you can. |
| Driver placement | depends | KEF KC62 fires side and SVS PB-4000 fires front. A down-firing driver is more forgiving of a grille-less look and of a hard floor; a front-firing one is the safer choice on a thick carpet or a suspended timber floor. |
| Cabinet size | depends | KEF KC62 is about 92% 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 | B | SVS PB-4000 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 | A | KEF KC62 costs less - $1,500 against $2,300, about 35% less. |
A KEF KC62 B SVS PB-4000
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?
Neither runs away with it - they trade advantages. Let your room size and where the box can actually stand settle it. Films or music? If this is mainly a home cinema, SVS PB-4000 will hit harder for the money; if it is mainly for music in a normal-sized room, KEF KC62 is usually the easier one to make sound right. Check your amplifier first: if it has no subwoofer or preamp output, KEF KC62 is the only one of these two you can connect at all.
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.