In this review, we will be comparing KC62 and Dynamo 400, two Powered Subwoofer speakers from KEF and MartinLogan. Being Powered subwoofers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features of KEF KC62 and MartinLogan 400 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the KEF KC62 and MartinLogan 400 compare and hopefully end up with enough arguments to decide which one of these subwoofers is the better choice for you.
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Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.KEF KC62 and MartinLogan 400 have a totally different setup: the KEF KC62 features 2 x 6.5-inch drivers whereas the Dynamo 400 features 1 x 8-inch drivers.
Frequency Response
KC62 has a frequency range of 11-200 Hz whereas Dynamo 400 has a frequency range of 30-200 Hz. With a minimum frequency of 11Hz, the KC62 can go significantly deeper on the low side and provide stronger bass compared to the Dynamo 400's min frequency of 30Hz.
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 Subwoofer class in our database.
Low Frequency
Subwoofer Speakers
High Frequency
Subwoofer Speakers
Cabinet Type
The KEF KC62 has a Acoustic Suspension type cabinet. Acoustic Suspension aka Sealed type subwoofers have enclosures that are sealed hence no ports or holes exists on the cabinet. Sealed designs helps to provide more accurate and tight bass responses compared to ported designs. On the other hand the MartinLogan 400 have Bass reflex type enclosure.
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 KEF KC62's and MartinLogan 400's external dimensions. KEF KC62 has external dimensions of 245.0 x 258.0 x 281.0mm ( 9-5/8inch x 10-1/8inch x 11-1/16inch ) whereas MartinLogan 400 has external dimensions of 385.0 x 339.0 x 388.0mm ( 15-1/8 x 13-5/16 x 15-1/4inch) .
MartinLogan 400 is clearly the larger of the two speakers. Its body is 81mm wider, 140mm taller and 107mm deeper than KEF KC62.
Below you can see the front view size comparison of KEF KC62 and MartinLogan 400 in scale.
Comparison image of KEF KC62 and MartinLogan 400 Size and External Dimensions
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 KEF KC62 is approximately 725.0cm2 / 112.4inch2 and base area of the MartinLogan 400 is approximately 1315.3cm2 / 203.9inch2. The KC62 requires 45% less surface area than the Dynamo 400 which gives it a small advantage on placement in tight spaces.
Weight Comparison The weight of a subwoofer may become an important factor if you need to move and reposition the unit often to find the optimal positioning, also known as 'Subwoofer Crawling'. The KEF KC62 weighs 14.05kg / 30.9lbs and the MartinLogan 400 weighs 12.95kg / 28.5lbs. This makes the KC62 8% heavier than the Dynamo 400.
Here is a comparison of how KC62 and Dynamo 400's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of KEF KC62?
Here are the items that are included inside the box of KC62:
Powered subwoofer6.5-feet AC power cordSpeaker-level input blockUser ManualImportant Safety InformationWarranty Information
What's in the Box of MartinLogan 400?
Here are the items that come with the Dynamo 400:
Powered subwoofer6.5-feet AC power cordUser-feets Manual
 Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
11 Hz
vs
30 Hz
|
Generates deeper bass |
 Height |
245mm
vs
385mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
725cm2
vs
1315cm2
|
Takes less floor space |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
| Woofer Size |
8 inches
vs
6.5 inches
|
Larger woofer |
 Price per pair* |
500USD
vs
1500USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
KEF KC62 |
MartinLogan Dynamo 400 |
| Brand |
KEF |
MartinLogan |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1000 watts |
75 watts |
| Frequency Response |
11-200 Hz |
30-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1000-watt RMS |
75-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
1 |
| Woofer Size |
6.5" |
8" |
| Woofer Composition |
|
Polypropylene |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
side |
bottom |
Physical Specs |
|
|
| Height |
245.0mm (9.6") |
385.0mm (15.2") |
| Width |
258.0mm (10.2") |
339.0mm (13.3") |
| Depth |
281.0mm (11.1") |
388.0mm (15.3") |
| Weight |
14.05kg (30.9lbs) |
12.95kg (28.5lbs) |
| Enclosure |
Acoustic Suspension |
Bass reflex |
| Available Colors |
n/a |
Satin Black |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
3 Yrs w/ Registration |
| Labor Warranty |
2 Years |
3 Yrs w/ Registration |