In this review, we will be comparing Gravis II and Gravis III, two Powered Subwoofer speakers by Sonus faber. 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 II and Sonus faber Gravis III 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 II and Sonus faber Gravis III 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.Sonus faber Gravis IIand Sonus faber Gravis III have the same driver set up: Both subwoofers have 1 x 10" drivers.
Frequency Response
Gravis II and Gravis III has exactly the same frequency range of 25-120 Hz.
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 II has a Passive Radiator type cabinet. Passive Radiator type subwoofers sports a non-powered cone that moves in response to the main woofer to move air out in order to generate stronger bass in a smaller body compared to ported or sealed designs. On the other hand the Sonus faber Gravis III have Acoustic Suspension type enclosure. 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 Sonus faber Gravis II's and Sonus faber Gravis III's external dimensions. Sonus faber Gravis II has external dimensions of 407.0 x 358.0 x 435.0mm ( 16inch x 14-1/16inch x 17-1/8inch ) whereas Sonus faber Gravis III has external dimensions of 415.0 x 400.0 x 495.0mm ( 16-5/16 x 15-3/4 x 19-1/2inch) .
Sonus faber Gravis III is clearly the larger of the two speakers. Its body is 42mm wider, 8mm taller and 60mm deeper than Sonus faber Gravis II.
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 II is approximately 1557.3cm2 / 241.4inch2 and base area of the Sonus faber Gravis III is approximately 1980.0cm2 / 306.9inch2. The Gravis II requires 21% less surface area than the Gravis III 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 Sonus faber Gravis II weighs 21.50kg / 47.3lbs and the Sonus faber Gravis III weighs 26.70kg / 58.7lbs. This makes the Gravis III 24% heavier than the Gravis II.
Here is a comparison of how Gravis II and Gravis III's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Passive Radiator |
2 x 10-inch
vs
None
|
Increases the bass performance |
 Height |
407mm
vs
415mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1557cm2
vs
1980cm2
|
Takes less floor space |
| General |
Sonus faber Gravis II |
Sonus faber Gravis III |
| Brand |
Sonus faber |
Sonus faber |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
350 watts |
600 watts |
| Frequency Response |
25-120 Hz |
25-120 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
350-watt RMS |
600-watt RMS |
| Watts Peak (Max) |
n/a |
900-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
10" |
10" |
| Woofer Composition |
Treated Paper |
Honeycomb sandwich |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
Continuously adjustable |
| Firing Direction |
front |
n/a |
Physical Specs |
|
|
| Height |
407.0mm (16") |
415.0mm (16.3") |
| Width |
358.0mm (14.1") |
400.0mm (15.7") |
| Depth |
435.0mm (17.1") |
495.0mm (19.5") |
| Weight |
21.50kg (47.3lbs) |
26.70kg (58.7lbs) |
| Enclosure |
Passive Radiator |
Acoustic Suspension |
| Available Colors |
Piano Black,Matte White |
n/a |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Yr/3 Yr registered |
|
| Labor Warranty |
2 Yr/3 Yr registered |
|