In this review, we will be comparing Monitor XT35 and R2c, two Passive Center Channel speakers from Polk Audio and KEF.
Let's have a brief look at the main features
of Polk XT35 and KEF R2c first before getting into our more
detailed comparison.
Polk XT35 Key Specs
- 2-way Design
- 1" High-res dome Tweeter
- 4 x 3" bi-laminate paper cone Woofer
- 57-40k Hz Frequency Response
- 87 dB Sensitivity
- Impedance: 8ohms
- Power Range:25-200watts
- Weight:6.36kg
- Dimensions (H x W x D): 107.0" x 24-7/16" x 5-9/16"( 107.0 x 621.0 x 142.0mm )
KEF R2c Key Specs
- 3-way Design
- 1" Dome Tweeter
- 5" Midrange
- 2 x 5.25" Hybrid Aluminum Woofer
- 5" Midrange
- 74-28k Hz Frequency Response
- 87 dB Sensitivity
- Impedance: 8ohms
- Power Range:15-200watts
- Weight:16.90kg
- Dimensions (H x W x D): 177.0" x 21-11/16" x 12-7/16"( 177.0 x 551.0 x 316.0mm )
What size room are the Polk XT35 and KEF R2c 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:
| Listening Environment* |
Polk XT35 |
KEF R2c |
| Near-field |
Poor |
Poor |
| Small Room |
Average |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Average |
Average |
| Very Large Room |
Poor |
Poor |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2,
Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: >
400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual
listening experience changes depending on floor height, room shape, surface materials, listening
position, speaker locations, etc.)
In the following sections, we will get into more detail in order to better understand how the Polk XT35 and KEF R2c compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
One of the fundamental differences between these two speakers is that Monitor XT35 is a 2-way design whereas the R2c is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
| Driver |
Polk XT35 |
KEF R2c |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
1 x 5-inch |
|
Woofer
|
4 x 3-inch
|
2 x 5.25-inch
|
Monitor XT35 features a 1" Terylene High-res dome Tweeter and 4 x 3" bi-laminate paper cone Woofer . On the other hand, the R2c features a 1" aluminum Dome Tweeter , a 5" Midrange and 2 x 5.25" Hybrid Aluminum Woofer with a Crossover frequency at 400Hz and 2900Hz.
Frequency Response
Monitor XT35 has a frequency range of 57-40k Hz whereas R2c has a frequency range of 74-28k Hz. With a minimum frequency of 57Hz, the Monitor XT35 can go significantly deeper on the low side and provide stronger bass compared to the R2c's min frequency of 74Hz.
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 Center Channel class in our database.
Low Frequency
Center Channel Speakers
High Frequency
Center Channel 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
Monitor XT35 and R2c have the same Impedance of 8 ohms and their sensitivity is also same at 87 dB.
Sensitivity
Center Channel 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.
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
R2c features Binding post posts which make bi-amping or bi-wiring possible. Monitor XT35 has a 5-Way post which doesn't feature bi-amping/bi-wiring.
Polk XT35's 5-Way post terminals
KEF R2c's Binding post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both Monitor XT35 and R2c have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
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 Polk XT35's and KEF R2c's external dimensions. Polk XT35 has external dimensions of 107.0 x 621.0 x 142.0mm ( 4-3/16 x 24-7/16 x 5-9/16inch) whereas KEF R2c has external dimensions of 177.0 x 551.0 x 316.0mm ( 6-15/16 x 21-11/16 x 12-7/16inch) .
Polk XT35 is 70mm shorter and 174mm less deeper than KEF R2c but it is also 70mm wider.
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 Polk XT35 is approximately 881.8cm2 / 136.7inch2 and base area of the KEF R2c is approximately 1741.2cm2 / 269.9inch2. The Monitor XT35 requires 49% less surface area than the R2c 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 Polk XT35 weighs 6.36kg / 14lbs and the KEF R2c weighs 16.90kg / 37.2lbs. This makes the R2c 166% heavier than the Monitor XT35.
Here is a comparison of how Monitor XT35 and R2c's weights compare with the average, max and min weights in Passive Center Channel class.
Weight
All Center Channel Speakers
What's in the Box of Polk XT35?
Here are the items that are included inside the box of Monitor XT35:
Center-channel loudspeakerGrille (attached)4 Self-adhesive rubber feetOwners ManualOnline Product RegistrationWall-Mount Template
What's in the Box of KEF R2c?
Here are the items that come with the R2c:
Center-channel loudspeakerGrille4 Self-adhesive rubber feetUser ManualWarranty Information
 Number of Woofers |
4
vs
2
|
More woofers |
|
Low Frequency Response |
57 Hz
vs
74 Hz
|
Generates deeper bass |
 High Frequency Response |
40k Hz
vs
28k Hz
|
Generates higher frequency |
 Height |
107mm
vs
177mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
881cm2
vs
1741cm2
|
Takes less floor space |
 Price per pair* |
299USD
vs
1300USD
|
costs less (*prices may change depending on the seller, location and time) |
 Driver Setup |
3-way
vs
2-way
|
Have a dedicated mid-range driver |
|
Woofer Size |
5.25 inches
vs
3 inches
|
Larger woofer |
| General |
Polk Audio Monitor XT35 |
KEF R2c |
| Brand |
Polk Audio |
KEF |
| Speaker Type |
Low-profile center channel speaker |
Center channel speaker |
| Power Range |
25-200 watts |
15-200 watts |
| Sensitivity |
87 dB |
87 dB |
| Impedance |
8 ohms |
8 ohms |
| Impedance |
n/a |
3.2 ohms |
| Frequency Response |
57-40k Hz |
74-28k Hz |
Drivers |
|
|
| Woofer Quantity |
4 |
2 |
| Woofer Size |
3" |
5.25" |
| Woofer Composition |
bi-laminate paper cone |
Hybrid Aluminum |
| Woofer Surround Material |
n/a |
Rubber |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
High-res dome |
Dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
N/A" |
5" |
| Crossover Frequency |
n/a |
400Hz and 2900Hz |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
107.0mm (4.2") |
177.0mm (7") |
| Width |
621.0mm (24.4") |
551.0mm (21.7") |
| Depth |
142.0mm (5.6") |
316.0mm (12.4") |
| Weight |
6.36kg (14lbs) |
16.90kg (37.2lbs) |
| Enclosure |
Bass Reflex |
Acoustic Suspension |
| Available Colors |
Black |
Black Gloss, White Gloss, Walnut |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
n/a |
Yes |
Other |
|
|
| Parts Warranty |
5 Years |
5 Years |
| Labor Warranty |
5 Years |
5 Years |