In this review, we will be comparing Motion F20 and R700, two Passive Floor-standing speakers from MartinLogan and Polk Audio. Let's have a brief look at the main features
of MartinLogan Motion F20 and Polk R700 first before getting into our more
detailed comparison.
What size room are the MartinLogan Motion F20 and Polk R700 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 Motion F20 and Polk R700 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 Motion F20 and R700 are 3-way speakers.
| Driver |
MartinLogan Motion F20 |
Polk R700 |
|
Driver Setup
|
3-way
|
3-way
|
|
Tweeter
|
1.0 x 1.4-inch
|
1-inch
|
|
Midrange
|
1 x 5.5-inch |
1 x 6.5-inch |
|
Woofer
|
2 x 5.5-inch
|
2 x 8-inch
|
Motion F20 features a 1.0 x 1.4" Folded Motion Ribbon Tweeter , a 5.5" Midrange and 2 x 5.5" Aluminum Woofer with a Crossover frequency at 230Hz and 2600Hz. On the other hand, the R700 features a 1" Pinnacle Ring Radiator Tweeter , a 6.5" Midrange and 2 x 8" Polypropylene Woofer with a Crossover frequency at 350Hz and 2700Hz.
Frequency Response
Motion F20 has a frequency range of 35-25k Hz whereas R700 has a frequency range of 38-38k Hz. With a minimum frequency of 35Hz, the Motion F20 can go slightly deeper then the R700's min frequency of 38Hz.
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
Motion F20 is a 4 ohms speaker compared to the R700 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 Motion F20 can provide this impedance level.
These two speakers also have different sensitivity levels. Motion F20 sensitivity is rated at 92 dB and the R700's is rated at 88 dB. This 4 dB difference makes the MartinLogan Motion F20 a more sensitive speaker compared to Polk R700, hence will play louder with the same amount of watts.
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.
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 F20 and R700 features dual binding post speaker terminals for bi-amping or bi-wiring.
MartinLogan Motion F20's Custom 5-way bi-wire tool-less binding posts terminals allows Bi-amping or bi-wiring
Polk R700's Post terminals allows Bi-amping or bi-wiring
Cabinet Type and Port Position
Both Motion F20 and R700 have bottom firing ports.
Polk R700 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 MartinLogan Motion F20's and Polk R700's external dimensions. MartinLogan Motion F20 has external dimensions of 1127 x 298 x 362mm ( 44-3/4inch x 11-3/4inch x 14-1/4inch ) whereas Polk R700 has external dimensions of 1143.8 x 320.7 x 428.3mm ( 45 x 12.6 x 16.9inch) .
Polk R700 is clearly the larger of the two speakers. Its body is 22.7mm wider, 16.8mm taller and 66.3mm deeper than MartinLogan Motion F20.
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 F20 is approximately 1078.8cm2 / 167.2inch2 and base area of the Polk R700 is approximately 1373.6cm2 / 212.9inch2. The Motion F20 requires 21% less surface area than the R700 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 MartinLogan Motion F20 weighs 27.20kg / 59.8lbs and the Polk R700 weighs 35.90kg / 79lbs. This makes the R700 32% heavier than the Motion F20.
Here is a comparison of how Motion F20 and R700'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 Polk R700?
Here are the items that come with the R700:
Floorstanding loudspeaker
4 Outrigger feet (pre-installed)
4 Rubber feet (pre-installed)
4 Spike feet (pre-installed)
Grille
Hex-key
Owner's Manual
Online Registration
 Sensitivity |
92 dB
vs
88 dB
|
Play louder with same amount of amplification power |
 Low Frequency Response |
35 Hz
vs
38 Hz
|
Generates deeper bass |
 Height |
1127mm
vs
1143mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1078cm2 (298x362mm)
vs
1373cm2 (320x428mm)
|
Takes less floor space |
 Nominal Impedance |
8 ohms
vs
4 ohms
|
Less selective with amplifiers |
| Woofer Size |
8 inches
vs
5.5 inches
|
Larger woofer |
 High Frequency Response |
38k Hz
vs
25k Hz
|
Generates higher frequency |
 Price per pair* |
2198USD
vs
3498USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
MartinLogan Motion F20 |
Polk Audio Reserve R700 |
| Brand |
MartinLogan |
Polk Audio |
| Speaker Type |
Floor-standing speaker |
Floor-standing speaker |
| Power Range |
20-300 watts |
50-300 watts |
| Sensitivity |
92 dB |
88 dB |
| Impedance |
4 ohms |
8 ohms |
| Impedance |
n/a |
3.6 ohms |
| Frequency Response |
35-25k Hz |
38-38k Hz |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
5.5" |
8" |
| Woofer Composition |
Aluminum |
Polypropylene |
| Woofer Surround Material |
Rubber |
Rubber |
| Tweeter Size |
1.0 x 1.4" |
1" |
| Tweeter Type |
Folded Motion Ribbon |
Pinnacle Ring Radiator |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
5.5" |
6.5" |
| Crossover Frequency |
230Hz and 2600Hz |
350Hz and 2700Hz |
| Firing Direction |
bottom |
bottom |
| Suggested Break-in Period |
Allow 72 hours of break-in |
n/a |
Physical Specs |
|
|
| Height |
1127.0mm (44.4") |
1143.8mm (45") |
| Width |
298.0mm (11.7") |
320.7mm (12.6") |
| Depth |
362.0mm (14.3") |
428.3mm (16.9") |
| Weight |
27.20kg (59.8lbs) |
35.90kg (79lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
n/a |
MDF/Vinyl |
| Available Colors |
Gloss Black, Walnut, and Satin White |
Black, Walnut, White |
| 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 |