In this review, we will be comparing PerformaBe F228Be and R11, two Passive Floor-standing speakers from Revel and KEF. Let's have a brief look at the main features
of Revel PerformaBe F228Be and KEF R11 first before getting into our more
detailed comparison.
What size room are the Revel PerformaBe F228Be and KEF R11 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision factor. Here we have compared their suitability to various sizes of environments considering their size and max power parameters:
In the following sections, we will get into more detail in order to better understand how the Revel PerformaBe F228Be and KEF R11 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
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Drivers
Both PerformaBe F228Be and R11 are 3-way speakers.
| Driver |
Revel PerformaBe F228Be |
KEF R11 |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
1 x 5.25-inch |
1 x 5-inch |
|
Woofer
|
2 x 8-inch
|
4 x 6.5-inch
|
PerformaBe F228Be features a 1" beryllium dome with proprietary acoustic lens waveguide Tweeter , a 5.25" Midrange and 2 x 8" DCC Aluminum Woofer . On the other hand, the R11 features a 1" aluminum Dome Tweeter , a 5" Midrange and 4 x 6.5" Hybrid Aluminum Woofer with a Crossover frequency at 400Hz and 2900Hz.
Frequency Response
PerformaBe F228Be has a frequency range of 27-44k Hz whereas R11 has a frequency range of 46-28k Hz. With a minimum frequency of 27Hz, the PerformaBe F228Be can go significantly deeper on the low side and provide stronger bass compared to the R11's min frequency of 46Hz.
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 Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
PerformaBe F228Be and R11 have the same Impedance of 8 ohms and their sensitivity is also same at 90 dB.
Sensitivity
Floor-standing Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using an amplifier within this range ensures the nominal performance , inputting a power that is higher than the max wattage can result in a damaged speaker.
PerformaBe F228Be can handle a max power of 350 watts RMS from the amp the whereas R11 has a max power handling value of 300 watts RMS, 50 watts less than the PerformaBe F228Be.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
Both PerformaBe F228Be and R11 features dual binding post speaker terminals for bi-amping or bi-wiring.
KEF R11's Binding post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
PerformaBe F228Be has a front firing port whereas R11 has a rear firing ports. Revel PerformaBe F228Be's front-firing port gives more flexibility in placement in regards to proximity to walls compared to KEF R11 with its rear-firing port.
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 PerformaBe F228Be's and KEF R11's external dimensions. Revel PerformaBe F228Be has external dimensions of 1182.0 x 301.0 x 337.0mm ( 46-1/2 x 11-13/16 x 13-1/4inch) whereas KEF R11 has external dimensions of 1301.0 x 312.0 x 389.0mm ( 51-3/16 x 12-1/4 x 15-5/16inch) .
KEF R11 is clearly the larger of the two speakers. Its body is 11mm wider, 119mm taller and 52mm deeper than Revel PerformaBe F228Be.
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 PerformaBe F228Be is approximately 1014.4cm2 / 157.2inch2 and base area of the KEF R11 is approximately 1213.7cm2 / 188.1inch2. The PerformaBe F228Be requires 16% less surface area than the R11 which gives it a small advantage on placement in tight spaces.
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The Revel PerformaBe F228Be weighs 37.27kg / 82lbs and the KEF R11 weighs 37.70kg / 82.9lbs. This makes the R11 1% heavier than the PerformaBe F228Be.
Here is a comparison of how PerformaBe F228Be and R11's weights compare with the average, max and min weights in Passive Floor-standing class.
Weight
All Floor-standing Speakers
What's in the Box of Revel PerformaBe F228Be?
Here are the items that are included inside the box of PerformaBe F228Be:
Floorstanding loudspeakerGrille4 Spike feet4 Locking rings4 Washers2 Terminal jumpers (pre-installed)Foam port plugOwners Manual
What's in the Box of KEF R11?
Here are the items that come with the R11:
Floorstanding loudspeakerGrille2 Foam port plugs4 Outrigger feet4 Spikes4 Protective discs4 Screws4 WashersWrenchHex-keyUser ManualWarranty Information
 Max Input Power |
350 watts
vs
300 watts
|
Handle more power from your amplifier |
 Woofer Size |
8 inches
vs
6.5 inches
|
Larger woofer |
| Low Frequency Response |
27 Hz
vs
46 Hz
|
Generates deeper bass |
 High Frequency Response |
44k Hz
vs
28k Hz
|
Generates higher frequency |
 Port Position |
Front
vs
Rear
|
Gives more flexibility placing close to walls |
 Height |
1182mm
vs
1301mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1014cm2 (301x337mm)
vs
1213cm2 (312x389mm)
|
Takes less floor space |
| Number of Woofers |
4
vs
2
|
More woofers |
 Price per pair* |
6000USD
vs
11000USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Revel PerformaBe F228Be |
KEF R11 |
| Brand |
Revel |
KEF |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
50-350 watts |
15-300 watts |
| Sensitivity |
90 dB |
90 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.2 ohms |
| Frequency Response |
27-44k Hz |
46-28k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
4 |
| Woofer Size |
8" |
6.5" |
| Woofer Composition |
DCC Aluminum |
Hybrid Aluminum |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
dome with proprietary acoustic lens waveguide |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
5.25" |
5" |
| Crossover Frequency |
n/a |
400Hz and 2900Hz |
| Firing Direction |
front |
rear |
Physical Specs |
|
|
| Height |
1182.0mm (46.5") |
1301.0mm (51.2") |
| Width |
301.0mm (11.9") |
312.0mm (12.3") |
| Depth |
337.0mm (13.3") |
389.0mm (15.3") |
| Weight |
37.27kg (82lbs) |
37.70kg (82.9lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
Wood/Lacquer |
MDF/Lacquer |
| Available Colors |
Gloss White |
Black Gloss, White Gloss, Walnut |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
Yes |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |