In this review, we will be comparing Bravus III B215 Dual 15" Cinema Powered Subwoofer and KF92, two Powered Subwoofer speakers from Aperion 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 Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer and KEF KF92 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 Aperion Bravus III B215 Dual 15" Cinema Powered Subwooferand KEF KF92 have a double woofer setup however the Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer's woofer is 15-inch whereas the KEF KF92 features a 9-inch woofer.
Frequency Response
Bravus III B215 Dual 15" Cinema Powered Subwoofer has a frequency range of 15-180 Hz whereas KF92 has a frequency range of 11-200 Hz. With a minimum frequency of 11Hz, the KF92 can go slightly deeper then the Bravus III B215 Dual 15" Cinema Powered Subwoofer's min frequency of 15Hz.
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
Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer
High Frequency
Subwoofer Speakers
Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer
Cabinet Type
The Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer 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 KF92 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 Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer's and KEF KF92's external dimensions. Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer has external dimensions of 1099.8 x 530.9 x 500.4mm (43.3 x 20.9 x 19.7inch) whereas KEF KF92 has external dimensions of 353.0 x 331.0 x 362.0mm (13-7/8 x 13 x 14-1/4inch).
Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer is clearly the larger of the two speakers. Its body is 199.9mm wider, 746.8mm taller and 138.4mm deeper than KEF KF92.
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 Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer is approximately 2656.6cm2 / 411.8inch2 and base area of the KEF KF92 is approximately 1198.2cm2 / 185.7inch2. The Bravus III B215 Dual 15" Cinema Powered Subwoofer requires 122% more surface area than the KF92 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 Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer weighs 83.91kg / 184.6lbs and the KEF KF92 weighs 20.05kg / 44.1lbs. This makes the Bravus III B215 Dual 15" Cinema Powered Subwoofer 319% heavier than the KF92.
Here is a comparison of how Bravus III B215 Dual 15" Cinema Powered Subwoofer and KF92's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer
 Woofer Size |
15 inches
vs
9 inches
|
Larger woofer |
| Low Frequency Response |
11 Hz
vs
15 Hz
|
Generates deeper bass |
 High Frequency Response |
200k Hz
vs
180k Hz
|
Generates higher frequency |
 Height |
353mm
vs
1099mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1198cm2
vs
2656cm2
|
Takes less floor space |
 Price per pair* |
2000USD
vs
4999USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Aperion Bravus III B215 Dual 15" Cinema Powered Subwoofer |
KEF KF92 |
| Brand |
Aperion |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1300 watts |
1000 watts |
| Impedance |
4 ohms |
n/a |
| Frequency Response |
15-180 Hz |
11-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1300-watt RMS |
1000-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
15" |
9" |
| Woofer Composition |
|
Hybrid aluminum |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
40-160 Hz |
n/a |
Physical Specs |
|
|
| Height |
1099.8mm (43.3") |
353.0mm (13.9") |
| Width |
530.9mm (20.9") |
331.0mm (13") |
| Depth |
500.4mm (19.7") |
362.0mm (14.3") |
| Weight |
83.91kg (184.6lbs) |
20.05kg (44.1lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
|
2 Years |
| Labor Warranty |
|
2 Years |