In this review, we will be comparing MartinLogan Foundation C1 and Monitor XT35, two Passive Center Channel speakers from MartinLogan and Polk Audio. Let's have a brief look at the main features
of MartinLogan Foundation C1 and Polk XT35 first before getting into our more
detailed comparison.
What size room are the MartinLogan Foundation C1 and Polk XT35 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 MartinLogan Foundation C1 and Polk XT35 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 MartinLogan Foundation C1 and Monitor XT35 are 2-way speakers.
| Driver |
MartinLogan Foundation C1 |
Polk XT35 |
|
Driver Setup
|
2-way
|
2-way
|
|
Tweeter
|
1-inch
|
1-inch
|
|
Midrange
|
- |
- |
|
Woofer
|
2 x 5-1/2-inch
|
4 x 3-inch
|
MartinLogan Foundation C1 features a 1" Gen2 Obsidian Folded Motion Ribbon Tweeter and 2 x 5-1/2" Aluminum Woofer with a Crossover frequency at 2900 Hz - 3200 Hz. On the other hand, the Monitor XT35 features a 1" Terylene High-res dome Tweeter and 4 x 3" bi-laminate paper cone Woofer .
Frequency Response
MartinLogan Foundation C1 has a frequency range of 53-23k Hz whereas Monitor XT35 has a frequency range of 57-40k Hz. With a minimum frequency of 53Hz, the MartinLogan Foundation C1 can go slightly deeper then the Monitor XT35's min frequency of 57Hz.
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
MartinLogan Foundation C1
High Frequency
Center Channel Speakers
MartinLogan Foundation C1
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
MartinLogan Foundation C1 is a 4 ohms speaker compared to the Monitor XT35 which has a nominal impedance of 8 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the MartinLogan Foundation C1 can provide this impedance level.
These two speakers also have different sensitivity levels. MartinLogan Foundation C1 sensitivity is rated at 91 dB and the Monitor XT35's is rated at 87 dB. This 4 dB difference makes the MartinLogan Foundation C1 a more sensitive speaker compared to Polk XT35, hence will play louder with the same amount of watts.
Sensitivity
Center Channel Speakers
MartinLogan Foundation C1
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.
MartinLogan Foundation C1 can handle a max power of 200 watts RMS from the amp the whereas MartinLogan Foundation C1 has a max power handling value of 150 watts RMS , 50 watts less than the Monitor XT35.
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
MartinLogan Foundation C1 features 5-Way post type posts and Monitor XT35 has a 5-Way post type posts. None of these speakers feature bi-amping/bi-wiring.
MartinLogan Foundation C1's Binding post terminals
Polk XT35's 5-Way post terminals
Cabinet Type and Port Position
Both MartinLogan Foundation C1 and Monitor XT35 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 MartinLogan Foundation C1's and Polk XT35's external dimensions. MartinLogan Foundation C1 has external dimensions of 194.0 x 508.0 x 254.0mm ( 7-5/8inch x 20inch x 10inch ) whereas 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) .
Polk XT35 is 87mm shorter and 112mm less deeper than MartinLogan Foundation C1 but it is also 113mm 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 MartinLogan Foundation C1 is approximately 1290.3cm2 / 200.0inch2 and base area of the Polk XT35 is approximately 881.8cm2 / 136.7inch2. The MartinLogan Foundation C1 requires 46% more surface area than the Monitor XT35 which gives it a small disadvantage 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 MartinLogan Foundation C1 weighs 8.18kg / 18lbs and the Polk XT35 weighs 6.36kg / 14lbs. This makes the MartinLogan Foundation C1 29% heavier than the Monitor XT35.
Here is a comparison of how MartinLogan Foundation C1 and Monitor XT35's weights compare with the average, max and min weights in Passive Center Channel class.
Weight
All Center Channel Speakers
MartinLogan Foundation C1
What's in the Box of Polk XT35?
Here are the items that come with the Monitor XT35:
Center-channel loudspeakerGrille (attached)4 Self-adhesive rubber feetOwners ManualOnline Product RegistrationWall-Mount Template
 Sensitivity |
91 dB
vs
87 dB
|
Play louder with same amount of amplification power |
 Woofer Size |
5-1/2 inches
vs
3 inches
|
Larger woofer |
| Low Frequency Response |
53 Hz
vs
57 Hz
|
Generates deeper bass |
 Max Input Power |
200 watts
vs
150 watts
|
Handle more power from your amplifier |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
| Number of Woofers |
4
vs
2
|
More woofers |
 High Frequency Response |
40k Hz
vs
23k Hz
|
Generates higher frequency |
 Height |
107mm
vs
194mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
881cm2 (621x142mm)
vs
1290cm2 (508x254mm)
|
Takes less floor space |
 Price per pair* |
299USD
vs
499USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
MartinLogan Foundation C1 |
Polk Audio Monitor XT35 |
| Brand |
MartinLogan |
Polk Audio |
| Speaker Type |
Center channel speaker |
Low-profile center channel speaker |
| Power Range |
up to 150 watts |
25-200 watts |
| Sensitivity |
91 dB |
87 dB |
| Impedance |
4 ohms |
8 ohms |
| Frequency Response |
53-23k Hz |
57-40k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
4 |
| Woofer Size |
5-1/2" |
3" |
| Woofer Composition |
Aluminum |
bi-laminate paper cone |
| Tweeter Size |
1" |
1" |
| Tweeter Type |
Folded Motion Ribbon |
High-res dome |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
N/A" |
| Crossover Frequency |
2900 Hz - 3200 Hz |
n/a |
| Firing Direction |
rear |
rear |
Physical Specs |
|
|
| Height |
194.0mm (7.6") |
107.0mm (4.2") |
| Width |
508.0mm (20") |
621.0mm (24.4") |
| Depth |
254.0mm (10") |
142.0mm (5.6") |
| Weight |
8.18kg (18lbs) |
6.36kg (14lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Available Colors |
Walnut,Black,Satin White |
Black |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
n/a |
Other |
|
|
| Parts Warranty |
5 years |
5 Years |
| Labor Warranty |
5 years |
5 Years |