In this review, we will be comparing Gravis VI and A120P, two Powered Subwoofer speakers from Sonus faber and JBL. 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 Sonus faber Gravis VI and JBL Stage A120P first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Sonus faber Gravis VI and JBL Stage A120P 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.Sonus faber Gravis VI and JBL Stage A120P have a totally different setup: the Sonus faber Gravis VI features 2 x 12.5-inch drivers whereas the A120P features 1 x 12-inch drivers.
Frequency Response
Gravis VI has a frequency range of 18-120 Hz whereas A120P has a frequency range of 32-150 Hz. With a minimum frequency of 18Hz, the Gravis VI can go significantly deeper on the low side and provide stronger bass compared to the A120P's min frequency of 32Hz.
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 Sonus faber Gravis VI 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 JBL Stage A120P 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 Sonus faber Gravis VI's and JBL Stage A120P's external dimensions. Sonus faber Gravis VI has external dimensions of 616.0 x 448.0 x 585.0mm ( 24-1/4 x 17-5/8 x 23-1/16inch) whereas JBL Stage A120P has external dimensions of 415.0 x 393.0 x 475.0mm ( 16-5/16 x 15-7/16 x 18-11/16inch) .
Sonus faber Gravis VI is clearly the larger of the two speakers. Its body is 55mm wider, 201mm taller and 110mm deeper than JBL Stage A120P.
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 Sonus faber Gravis VI is approximately 2620.8cm2 / 406.2inch2 and base area of the JBL Stage A120P is approximately 1866.8cm2 / 289.4inch2. The Gravis VI requires 40% more surface area than the A120P 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 Sonus faber Gravis VI weighs 52.00kg / 114.4lbs and the JBL Stage A120P weighs 18.68kg / 41.1lbs. This makes the Gravis VI 178% heavier than the A120P.
Here is a comparison of how Gravis VI and A120P's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
12.5 inches
vs
12 inches
|
Larger woofer |
| Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
18 Hz
vs
32 Hz
|
Generates deeper bass |
 High Frequency Response |
150k Hz
vs
120k Hz
|
Generates higher frequency |
 Height |
415mm
vs
616mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1866cm2
vs
2620cm2
|
Takes less floor space |
| General |
Sonus faber Gravis VI |
JBL Stage A120P |
| Brand |
Sonus faber |
JBL |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
1700 watts |
250 watts |
| Frequency Response |
18-120 Hz |
32-150 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
1700-watt RMS |
250-watt RMS |
| Watts Peak (Max) |
2400-watt RMS |
500-watt RMS |
Drivers |
|
|
| Woofer Quantity |
2 |
1 |
| Woofer Size |
12.5" |
12" |
| Woofer Composition |
Honeycomb sandwich |
Polycellulose |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
Continuously adjustable |
n/a |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
616.0mm (24.3") |
415.0mm (16.3") |
| Width |
448.0mm (17.6") |
393.0mm (15.5") |
| Depth |
585.0mm (23") |
475.0mm (18.7") |
| Weight |
52.00kg (114.4lbs) |
18.68kg (41.1lbs) |
| Enclosure |
Acoustic Suspension |
Bass reflex |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
|
1 Year |
| Labor Warranty |
|
1 Year |