In this review, we will be comparing Concerta B8 and KF92, two Powered Subwoofer speakers from Revel 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 Revel Concerta B8 and KEF KF92 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Revel Concerta B8 and KEF KF92 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.Revel Concerta B8 and KEF KF92 have a totally different setup: the Revel Concerta B8 features 1 x 8-inch drivers whereas the KF92 features 2 x 9-inch drivers.
Frequency Response
Concerta B8 has a frequency range of 45-200 Hz whereas KF92 has a frequency range of 11-200 Hz. With a minimum frequency of 11Hz, the KF92 can go significantly deeper on the low side and provide stronger bass compared to the Concerta B8's min frequency of 45Hz.
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
Both Revel Concerta B8 and KEF KF92 have Acoustic Suspension type cabinets. 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
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 Revel Concerta B8's and KEF KF92's external dimensions. Revel Concerta B8 has external dimensions of 355.0 x 269.0 x 288.0mm ( 13-15/16 x 10-9/16 x 11-5/16inch) whereas KEF KF92 has external dimensions of 353.0 x 331.0 x 362.0mm ( 13-7/8 x 13 x 14-1/4inch) .
Revel Concerta B8 is 62mm narrower and 74mm less deeper than KEF KF92 but it is also 2mm taller.
Below you can see the front view size comparison of Revel Concerta B8 and KEF KF92 in scale.
Comparison image of Revel Concerta B8 and KEF KF92 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 Revel Concerta B8 is approximately 774.7cm2 / 120.1inch2 and base area of the KEF KF92 is approximately 1198.2cm2 / 185.7inch2. The Concerta B8 requires 35% less surface area than the KF92 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 Revel Concerta B8 weighs 9.00kg / 19.8lbs and the KEF KF92 weighs 20.05kg / 44.1lbs. This makes the KF92 123% heavier than the Concerta B8.
Here is a comparison of how Concerta B8 and KF92's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of Revel Concerta B8?
Here are the items that are included inside the box of Concerta B8:
Wireless powered subwooferWireless transmitterAC power adapter (attached 6-feet DC cord)6-feet AC power cord16-feet Subwoofer/Trigger cable (male RCA and male minijack connector on each end) Owners ManualImportant Safety Instructions
What's in the Box of KEF KF92?
Here are the items that come with the KF92:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
 Base Surface Area |
774cm2 (269x288mm)
vs
1198cm2 (331x362mm)
|
Takes less floor space |
 Wireless Operation |
Yes
vs
No
|
Connect your subwoofer to your system wireless |
 Woofer Size |
9 inches
vs
8 inches
|
Larger woofer |
| Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
11 Hz
vs
45 Hz
|
Generates deeper bass |
 Height |
353mm
vs
355mm
|
Easier to fit in smaller spaces |
| General |
Revel Concerta B8 |
KEF KF92 |
| Brand |
Revel |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
200 watts |
1000 watts |
| Frequency Response |
45-200 Hz |
11-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
1000-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
2 |
| Woofer Size |
8" |
9" |
| Woofer Composition |
Paper |
Hybrid aluminum |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
bottom |
n/a |
Physical Specs |
|
|
| Height |
355.0mm (14") |
353.0mm (13.9") |
| Width |
269.0mm (10.6") |
331.0mm (13") |
| Depth |
288.0mm (11.3") |
362.0mm (14.3") |
| Weight |
9.00kg (19.8lbs) |
20.05kg (44.1lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
5 Years |
2 Years |
| Labor Warranty |
5 Years |
2 Years |