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Sonus faber Gravis III Subwoofer Review
Sonus faber Gravis III - Front View

Main Features

  • 10" Honeycomb sandwich Woofer
  • 600 watts RMS Output
  • 25-120 Hz Frequency Response
  • Weight: 58.86 lbs / 26.70kg
  • Dimensions (H x W x D): 16-5/16" x 15-3/4" x 19-1/2"
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Sonus faber Gravis III Subwoofer Review
Sonus faber Gravis III Sonus faber Gravis I...
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Gravis III is a Sealed type Powered Subwoofer by Sonus faber with a frequency range of 25-120 Hz. It was released in 2022. It features 1 x 10" Honeycomb sandwich Woofer, and powered by a Class AB 600 watts amplifier.

A sealed active subwoofer with a 10 inch infra-woofer on a 600 W RMS (900 W peak) Class AB amplifier. The crossover is continuously adjustable, so the quoted top end is where you set it; the bottom is 25 Hz at -6 dB. Line in on RCA and XLR, plus a Speakon high-level input. Gravis are sealed active subwoofers with Class AB amplification and a continuously adjustable crossover.

Gravis III is a member of Sonus faber's Gravis series of Powered subwoofers. The Gravis range are Sonus Faber's powered subwoofers, styled to match the Italian brand's speakers. Below you can see the main specs of these subwoofers as well as review and comparison links.

See all 5 Sonus faber Gravis models compared »

Sonus faber Gravis Series Subwoofers
Model Frequency Woofer Amp Power Weight
Sonus faber Gravis II
Compare
25-120k Hz 10" 350 watts 21.50kg
Sonus faber Gravis I
Compare
30-120k Hz 8" 150 watts 14.55kg
Sonus faber Gravis III
25-120k Hz 10" 600 watts 26.70kg
Sonus faber Gravis V
Compare
20-120k Hz 12.5" 850 watts 32.00kg
Sonus faber Gravis VI
Compare
18-120k Hz 12.5" 1700 watts 52.00kg


**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.

Frequency Response

Sonus faber Gravis III has a Frequency response range of 25-120 Hz at ±3dB. With the help of its 1 x 10-inch driver and 600 watts RMS ( 900 watts MAX ) amplifier, the Gravis III can go as low as 25 Hz which doesn't quite offer full range sound (20Hz-2kHZ) but it gets really close.

Here we have a comparison of how Gravis III's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Powered Subwoofers
Sonus faber Gravis III
Min
Average
Max
High Frequency
Subwoofer Speakers
Sonus faber Gravis III
Min
Average
Max

Inputs and Outputs

  • PreampLevel Inputs: Stereo RCA line, XLR, Speakon high level
  • SpeakerLevel Inputs: Yes

Sonus faber Gravis III External Dimensions and Weight

Sonus faber Gravis III has external dimensions of (Height x Width x Depth) 16-5/16 x 15-3/4 x 19-1/2inch (415.0 x 400.0 x 495.0mm ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of Sonus faber Gravis III is approximately 1980.0cm2 / 306.9inch2.

Weight

The Sonus faber Gravis III weighs 26.70kg / 58.7lbs. Weight of a subwoofer is an important factor when you need to move and reposition the unit often to find the optimal positioning, also known as 'Subwoofer Crawling'. Here is a comparison of how Gravis III's weight compares with the average, max and min weights in its class.

Weight
All Subwoofer Speakers
Sonus faber Gravis III
Min
Average
Max

Cabinet type and Materials

Sonus faber Gravis III has a Acoustic Suspension type cabinet. Acoustic suspension aka Sealed subwoofers are preferred for music oriented systems whereas the Ported subwoofers are generally accepted to be more suitable for home theatre systems.

Does the Sonus faber Gravis III come with a Grille?

Gravis III comes with grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible.

Recommended Accessories

Here is a list of accessories that we think you may need for the Sonus faber Gravis III.

  • Vibration Isolators: IsoAcoustics isolators are our favorite isolators but you may find more affordable options too.
  • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

Official Product Page

Official manufacturer's product page for the Sonus faber Gravis III speaker can be found below:
Official Product Page for Sonus faber Gravis III

Sonus faber Gravis III Detailed Specifications

General
BrandSonus faber
Full Model NameSonus faber Gravis III
TypePowered Subwoofer
Release Date2022
Frequency Response25-120 Hz
Enclosure TypeSealed
EnclosureAcoustic Suspension
Firing DirectionFront
Amplifier & Driver
Power (RMS)600 watts
Power (Peak)900 watts
Amplifier TypeClass AB
Woofer10-inch Honeycomb sandwich

Controls & Connections
Phase ControlYes
Line-level InputsStereo RCA line, XLR, Speakon high level
Speaker-level InputsYes
Physical
Dimensions (HxWxD)16-5/16" x 15-3/4" x 19-1/2" (415.0 x 400.0 x 495.0mm)
Weight26.70kg ( 58.86 lbs)
GrilleYes
Sonus faber Gravis III Alternatives in Powered Subwoofer Speakers
Model Frequency Woofer Amp Power Dimensions
Polk Monitor XT12
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24-160k Hz 12" 50 watts 16-7/16inch x 16-1/16inch x 19-1/16inch "
SVS SB-1000 Pro
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B&W DB4S
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Klipsch R-121SW
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28-120k Hz 12" 200 watts 16-5/8inch x 16inch x 20-15/16inch "
Klipsch R-101SW
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30-160k Hz 10" 150 watts 14-9/16inch x 14-1/16inch x 20-13/16inch "
Klipsch RP-1200SW
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KEF KC62
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Klipsch R-100SW
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32-120k Hz 10" 150 watts 14-5/8 x 12-9/16 x 18-1/16inch"
Wharfedale SW-15
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30-120k Hz 15" 400 watts 22-7/16inch x 19-3/8inch x 24-3/16inch "
Klipsch SPL-100
Compare
27-125k Hz 10" 200 watts 16-7/16 x 14-1/16 x 18-13/16inch"
B&W ASW610
Compare
27-140k Hz 10" 200 watts 12-5/8 x 12-1/4 x 15-1/2inch"
KEF KUBE 8b
Compare
34-140k Hz 8" 300 watts 11-9/16 x 11-5/8 x 13-5/16inch"
KEF KUBE 10b
Compare
24-140k Hz 10" 300 watts 14-5/8 x 14 x 15-5/8inch"
B&W ASW608
Compare
32-140k Hz 8" 200 watts 10-11/16 x 10-1/4 x 13-3/4inch"
JBL Stage A120P
Compare
32-150k Hz 12" 250 watts 16-5/16 x 15-7/16 x 18-11/16inch"
Klipsch SPL-120
Compare
24-125k Hz 12" 300 watts 17-11/16 x 14-3/4 x 21-1/4inch"
Frequently Asked Questions about Sonus faber Gravis III

How low can the Sonus faber Gravis III go?

The Sonus faber Gravis III has a frequency response of 25-120 Hz. It reaches down to 25Hz, deep enough for the low end of most music and movie effects.

How much power does the Sonus faber Gravis III have?

The Sonus faber Gravis III has a built-in 600-watt RMS (900-watt peak) Class AB amplifier.

Is the Sonus faber Gravis III sealed or ported?

The Sonus faber Gravis III uses a Sealed enclosure. Sealed subwoofers trade a little output for tighter, more accurate bass and a smaller cabinet, which many listeners prefer for music.

What driver does the Sonus faber Gravis III use?

The Sonus faber Gravis III has a 10-inch Honeycomb sandwich driver.

Does the Sonus faber Gravis III have app control or room correction?

Yes. The Sonus faber Gravis III offers phase control, letting you dial the sub into your room and blend it with your speakers.

How do you connect the Sonus faber Gravis III?

The Sonus faber Gravis III connects via line-level Stereo RCA line, XLR, Speakon high level and speaker-level Yes inputs.

How big and heavy is the Sonus faber Gravis III?

The Sonus faber Gravis III weighs 26.70kg / 58.7lbs and measures 16-5/16" x 15-3/4" x 19-1/2" (HxWxD).

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