In this review, we will be comparing Depth 212 and KF92, two Powered Subwoofer speakers from MartinLogan and KEF. 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 MartinLogan Depth 212 and KEF KF92 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the MartinLogan Depth 212 and KEF KF92 compare and hopefully end up with enough arguments to decide which one of these subwoofers 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
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Both MartinLogan Depth 212and KEF KF92 have a double woofer setup however the MartinLogan Depth 212's woofer is 12-inch whereas the KEF KF92 features a 9-inch woofer.
Frequency Response
Depth 212 has a frequency range of 18-120 Hz whereas KF92 has a frequency range of 11-200 Hz. With a minimum frequency of 11Hz, the KF92 can go significantly deeper on the low side and provide stronger bass compared to the Depth 212's min frequency of 18Hz.
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
Both MartinLogan Depth 212 and KEF KF92 have Acoustic Suspension type cabinets. 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.
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 Depth 212's and KEF KF92's external dimensions. MartinLogan Depth 212 has external dimensions of 533.0 x 503.0 x 518.0mm ( 21 x 19-13/16 x 20-3/8inch) whereas KEF KF92 has external dimensions of 353.0 x 331.0 x 362.0mm ( 13-7/8 x 13 x 14-1/4inch) .
MartinLogan Depth 212 is clearly the larger of the two speakers. Its body is 172mm wider, 180mm taller and 156mm deeper than KEF KF92.
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 Depth 212 is approximately 2605.5cm2 / 403.9inch2 and base area of the KEF KF92 is approximately 1198.2cm2 / 185.7inch2. The Depth 212 requires 117% more surface area than the KF92 which gives it a small disadvantage 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 MartinLogan Depth 212 weighs 57.60kg / 126.7lbs and the KEF KF92 weighs 20.05kg / 44.1lbs. This makes the Depth 212 187% heavier than the KF92.
Here is a comparison of how Depth 212 and KF92's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
12 inches
vs
9 inches
|
Larger woofer |
| Low Frequency Response |
11 Hz
vs
18 Hz
|
Generates deeper bass |
 High Frequency Response |
200k Hz
vs
120k Hz
|
Generates higher frequency |
 Height |
353mm
vs
533mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1198cm2
vs
2605cm2
|
Takes less floor space |
 Price per pair* |
2000USD
vs
5500USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
MartinLogan Depth 212 |
KEF KF92 |
| Brand |
MartinLogan |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1100 watts |
1000 watts |
| Frequency Response |
18-120 Hz |
11-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1100-watt RMS |
1000-watt RMS |
| Watts Peak (Max) |
2200-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
2 |
2 |
| Woofer Size |
12" |
9" |
| Woofer Composition |
Aluminium |
Hybrid aluminum |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
35–120Hz |
n/a |
Physical Specs |
|
|
| Height |
533.0mm (21") |
353.0mm (13.9") |
| Width |
503.0mm (19.8") |
331.0mm (13") |
| Depth |
518.0mm (20.4") |
362.0mm (14.3") |
| Weight |
57.60kg (126.7lbs) |
20.05kg (44.1lbs) |
| Enclosure |
Acoustic Suspension |
Acoustic Suspension |
| Grille |
Yes |
n/a |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
|
2 Years |
| Labor Warranty |
|
2 Years |