In this review, we will be comparing Subsonic and SPL-120, two Powered Subwoofer speakers from Wilson Audio and Klipsch. 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 Wilson Audio Subsonic and Klipsch SPL-120 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Wilson Audio Subsonic and Klipsch SPL-120 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.Wilson Audio Subsonic and Klipsch SPL-120 have a totally different setup: the Wilson Audio Subsonic features 3 x 12-inch drivers whereas the SPL-120 features 1 x 12-inch drivers.
Frequency Response
Subsonic has a frequency range of 10-150 Hz whereas SPL-120 has a frequency range of 24-125 Hz. With a minimum frequency of 10Hz, the Subsonic can go significantly deeper on the low side and provide stronger bass compared to the SPL-120's min frequency of 24Hz.
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 Wilson Audio Subsonic and Klipsch SPL-120 have Bass Reflex type cabinets. Bass Reflex type subwoofers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed 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 Wilson Audio Subsonic's and Klipsch SPL-120's external dimensions. Wilson Audio Subsonic has external dimensions of 1653.0 x 459.0 x 691.0mm ( 65-1/16 x 18-1/16 x 27-3/16inch) whereas Klipsch SPL-120 has external dimensions of 450.0 x 375.0 x 540.0mm ( 17-11/16 x 14-3/4 x 21-1/4inch) .
Wilson Audio Subsonic is clearly the larger of the two speakers. Its body is 84mm wider, 1203mm taller and 151mm deeper than Klipsch SPL-120.
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 Wilson Audio Subsonic is approximately 3171.7cm2 / 491.6inch2 and base area of the Klipsch SPL-120 is approximately 2025.0cm2 / 313.9inch2. The Subsonic requires 57% more surface area than the SPL-120 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 Wilson Audio Subsonic weighs 229.00kg / 503.8lbs and the Klipsch SPL-120 weighs 20.45kg / 45lbs. This makes the Subsonic 1,020% heavier than the SPL-120.
Here is a comparison of how Subsonic and SPL-120's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Number of Woofers |
3
vs
1
|
More woofers |
| Low Frequency Response |
10 Hz
vs
24 Hz
|
Generates deeper bass |
 High Frequency Response |
150k Hz
vs
125k Hz
|
Generates higher frequency |
 Port Position |
Front
vs
Rear
|
Gives more flexibility placing close to walls |
 Height |
450mm
vs
1653mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
2025cm2
vs
3171cm2
|
Takes less floor space |
 Price per pair* |
499USD
vs
47250USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Wilson Audio Subsonic |
Klipsch SPL-120 |
| Brand |
Wilson Audio |
Klipsch |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Sensitivity |
87 dB |
n/a |
| Impedance |
4 ohms |
n/a |
| Frequency Response |
10-150 Hz |
24-125 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
n/a |
300-watt RMS |
| Watts Peak (Max) |
n/a |
600-watt RMS |
Drivers |
|
|
| Woofer Quantity |
3 |
1 |
| Woofer Size |
12" |
12" |
| Woofer Composition |
Paper pulp |
Cerametallic |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
rear |
front |
Physical Specs |
|
|
| Height |
1653.0mm (65.1") |
450.0mm (17.7") |
| Width |
459.0mm (18.1") |
375.0mm (14.8") |
| Depth |
691.0mm (27.2") |
540.0mm (21.3") |
| Weight |
229.00kg (503.8lbs) |
20.45kg (45lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
| Biamp Inputs |
No |
n/a |
Other |
|
|
| Parts Warranty |
5 Years |
2 Years |
| Labor Warranty |
5 Years |
2 Years |