In this review, we will be comparing Motion XT C100 and HTM71 S2, two Passive Center Channel speakers from MartinLogan and Bowers Wilkins.
Let's have a brief look at the main features
of MartinLogan Motion XT C100 and BW HTM71 S2 first before getting into our more
detailed comparison.
MartinLogan Motion XT C100 Key Specs
- 2-way Design
- 1.25 x 2.4" Folded Motion XT Tweeter
- 2 x 6.5" Aluminum Woofer
- 42-25k Hz Frequency Response
- 93 dB Sensitivity
- Impedance: 5ohms
- Power Range:20-300watts
- Weight:15.40kg
- Dimensions (H x W x D): 203.0" x 24" x 14-1/2"( 203 x 610 x 368mm )
BW HTM71 S2 Key Specs
- 3-way Design
- 1" Decoupled Carbon Dome Tweeter
- 4" Midrange
- 2 x 6.5" Aerofoil Profile Woofer
- 4" Midrange
- 50-28k Hz Frequency Response
- 89 dB Sensitivity
- Impedance: 8ohms
- Power Range:30-200watts
- Weight:18.05kg
- Dimensions (H x W x D): 228.0" x 23-1/4" x 11-7/8"( 228.0 x 591.0 x 302.0mm )
What size room are the MartinLogan Motion XT C100 and BW HTM71 S2 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* |
MartinLogan Motion XT C100 |
BW HTM71 S2 |
| Near-field |
Poor |
Poor |
| Small Room |
Poor |
Average |
| Mid-size Room |
Good |
Good |
| Large Room |
Good |
Average |
| Very Large Room |
Average |
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 MartinLogan Motion XT C100 and BW HTM71 S2 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 Motion XT C100 is a 2-way design whereas the HTM71 S2 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 |
MartinLogan Motion XT C100 |
BW HTM71 S2 |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1.25 x 2.4-inch
|
1-inch
|
|
Midrange
|
- |
1 x 4-inch |
|
Woofer
|
2 x 6.5-inch
|
2 x 6.5-inch
|
Motion XT C100 features a 1.25 x 2.4" Folded Motion XT Tweeter and 2 x 6.5" Aluminum Woofer with a Crossover frequency at 1300Hz and 2500Hz. On the other hand, the HTM71 S2 features a 1" Decoupled Carbon Dome Tweeter , a 4" Midrange and 2 x 6.5" Aerofoil Profile Woofer .
Frequency Response
Motion XT C100 has a frequency range of 42-25k Hz whereas HTM71 S2 has a frequency range of 50-28k Hz. With a minimum frequency of 42Hz, the Motion XT C100 can go significantly deeper on the low side and provide stronger bass compared to the HTM71 S2's min frequency of 50Hz.
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
MartinLogan Motion XT C100
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
Motion XT C100 is a 5 ohms speaker compared to the HTM71 S2 which has a nominal impedance of 8 ohms.
These two speakers also have different sensitivity levels. Motion XT C100 sensitivity is rated at 93 dB and the HTM71 S2's is rated at 89 dB. This 4 dB difference makes the MartinLogan Motion XT C100 a more sensitive speaker compared to BW HTM71 S2, hence will play louder with the same amount of watts.
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.
Motion XT C100 can handle a max power of 300 watts RMS from the amp the whereas HTM71 S2 has a max power handling value of 200 watts RMS, 100 watts less than the Motion XT C100.
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 Motion XT C100 and HTM71 S2 features dual binding post speaker terminals for bi-amping or bi-wiring.
MartinLogan Motion XT C100's Custom 5-way bi-wire tool-less binding posts terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both Motion XT C100 and HTM71 S2 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 Motion XT C100's and BW HTM71 S2's external dimensions. MartinLogan Motion XT C100 has external dimensions of 203 x 610 x 368mm ( 8inch x 24inch x 14-1/2inch ) whereas BW HTM71 S2 has external dimensions of 228.0 x 591.0 x 302.0mm ( 8-15/16 x 23-1/4 x 11-7/8inch) .
BW HTM71 S2 is 19mm narrower and 66mm less deeper than MartinLogan Motion XT C100 but it is also 25mm taller.
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 Motion XT C100 is approximately 2244.8cm2 / 347.9inch2 and base area of the BW HTM71 S2 is approximately 1784.8cm2 / 276.6inch2. The Motion XT C100 requires 26% more surface area than the HTM71 S2 which gives it a small disadvantage on placement in tight spaces.