In this review, we will be comparing Q SUB120 and Monitor XT12, two Powered Subwoofer speakers from Q Acoustics and Polk Audio. 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 Q Acoustics Q SUB120 and Polk Monitor XT12 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Q Acoustics Q SUB120 and Polk Monitor XT12 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.Q Acoustics Q SUB120and Polk Monitor XT12 have the same driver set up: Both subwoofers have 1 x 12" drivers.
Frequency Response
Q SUB120 has a frequency range of 28-250 Hz whereas Monitor XT12 has a frequency range of 24-160 Hz. With a minimum frequency of 24Hz, the Monitor XT12 can go slightly deeper then the Q SUB120's min frequency of 28Hz.
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 Q Acoustics Q SUB120 has a Infinite Baffle type cabinet. On the other hand the Polk Monitor XT12 have Bass Reflex type enclosure. 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 Q Acoustics Q SUB120's and Polk Monitor XT12's external dimensions. Q Acoustics Q SUB120 has external dimensions of 400.0 x 400.0 x 432.0mm ( 15-3/4 x 15-3/4 x 17inch) whereas Polk Monitor XT12 has external dimensions of 418.0 x 408.0 x 485.0mm ( 16-7/16inch x 16-1/16inch x 19-1/16inch ) .
Polk Monitor XT12 is clearly the larger of the two speakers. Its body is 8mm wider, 18mm taller and 53mm deeper than Q Acoustics Q SUB120.
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 Q Acoustics Q SUB120 is approximately 1728.0cm2 / 267.8inch2 and base area of the Polk Monitor XT12 is approximately 1978.8cm2 / 306.7inch2. The Q SUB120 requires 13% less surface area than the Monitor XT12 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 Q Acoustics Q SUB120 weighs 22.50kg / 49.5lbs and the Polk Monitor XT12 weighs 17.73kg / 39lbs. This makes the Q SUB120 27% heavier than the Monitor XT12.
Here is a comparison of how Q SUB120 and Monitor XT12's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 High Frequency Response |
250k Hz
vs
160k Hz
|
Generates higher frequency |
 Height |
400mm
vs
418mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1728cm2
vs
1978cm2
|
Takes less floor space |
 Low Frequency Response |
24 Hz
vs
28 Hz
|
Generates deeper bass |
 Price per pair* |
399USD
vs
799USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Q Acoustics Q SUB120 |
Polk Monitor XT12 |
| Brand |
Q Acoustics |
Polk Audio |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
300 watts |
50 watts |
| Frequency Response |
28-250 Hz |
24-160 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
50-watt RMS |
| Watts Peak (Max) |
600-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
12" |
12" |
| Woofer Composition |
Paper composite |
Bi-laminate paper |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
400.0mm (15.7") |
418.0mm (16.5") |
| Width |
400.0mm (15.7") |
408.0mm (16.1") |
| Depth |
432.0mm (17") |
485.0mm (19.1") |
| Weight |
22.50kg (49.5lbs) |
17.73kg (39lbs) |
| Enclosure |
Infinite Baffle |
Bass Reflex |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
5 Years |
3 Years |
| Labor Warranty |
5 Years |
3 Years |