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The Sonus faber Gravis I is a compact powered subwoofer engineered for deep, controlled bass in smaller listening spaces. Its sealed, down-firing design and 210 mm (8") long-throw driver deliver tight low-end performance that blends naturally with stereo and home theater systems. A high-linearity Class AB amplifier provides 150 W RMS power, while adjustable crossover, phase control, and dual volume controls make integration easy and precise. With premium Italian design finishes and flexible inputs including LFE, RCA line, and Speakon high-level, Gravis I is an elegant upgrade for impactful bass.
Get the Details
Features & Specs
Sealed, down-firing enclosure for precision bass:
The closed-box alignment keeps bass fast and controlled, while the down-firing layout helps distribute low frequencies smoothly in compact rooms.
Long-throw 210 mm (8") driver for real low-end authority:
The treated paper cone and wide rubber surround are built for extended excursion, producing deeper bass with clean articulation.
High-linearity Class AB power for musical impact:
With 150 W RMS and 250 W peak output, the amplifier delivers dynamic punch while maintaining refined control at everyday listening levels.
Full tuning toolset for perfect blending:
Dial in the crossover from 30–120 Hz, use the 24 dB/oct slope for a cleaner handoff to your mains, and flip 0/180° phase to tighten alignment in your room.
Easy integration with nearly any system:
Use LFE for AV receivers, line-level RCA for traditional setups, or Neutrik Speakon high-level input when you want the subwoofer to follow your amplifier’s sonic character.
Design-forward finishes with Sonus faber craftsmanship:
Multiple cabinet finish options and a leather top bring a luxury look that complements high-end systems and modern interiors.
Sealed, down-firing enclosure for precision bass:
The closed-box alignment keeps bass fast and controlled, while the down-firing layout helps distribute low frequencies smoothly in compact rooms.
Long-throw 210 mm (8") driver for real low-end authority:
The treated paper cone and wide rubber surround are built for extended excursion, producing deeper bass with clean articulation.
High-linearity Class AB power for musical impact:
With 150 W RMS and 250 W peak output, the amplifier delivers dynamic punch while maintaining refined control at everyday listening levels.
Full tuning toolset for perfect blending:
Dial in the crossover from 30–120 Hz, use the 24 dB/oct slope for a cleaner handoff to your mains, and flip 0/180° phase to tighten alignment in your room.
Easy integration with nearly any system:
Use LFE for AV receivers, line-level RCA for traditional setups, or Neutrik Speakon high-level input when you want the subwoofer to follow your amplifier’s sonic character.
Design-forward finishes with Sonus faber craftsmanship:
Multiple cabinet finish options and a leather top bring a luxury look that complements high-end systems and modern interiors.
Expert Insight
Gravis I delivers impressively tight and musical bass for its compact size, adding depth without overpowering the rest of the system. Integration is straightforward thanks to flexible inputs, adjustable crossover controls, and a useful phase switch for room matching. The refined finish quality and premium details make it feel like a true high-end component in both sound and appearance.
Nate M
Brand Manager
Details
Sonus faber Gravis I Compact High-Performance Powered Subwoofer
Sonus faber Gravis I is a compact, high-performance powered subwoofer designed to bring deep, controlled bass to smaller rooms without overwhelming your space. Built around a sealed, down-firing design and a long-throw 210 mm (8") woofer, it delivers tight, musical low-end extension that blends naturally with stereo and home theater systems alike. With a high-linearity Class AB amplifier and flexible connection options—including LFE, line-level RCA, and high-level Speakon inputs—you can integrate Gravis I into nearly any setup, from bookshelf speakers to full AV systems. Finished with Sonus faber’s signature Italian craftsmanship, it pairs elegant cabinet options with a premium leather top, making it as visually refined as it is sonically capable.
What It's Good At:
Delivering tight, musical bass in smaller listening rooms without boominess
Seamless integration with stereo and home theater systems via LFE, RCA line, or high-level Speakon inputs
Fine-tuning blend with main speakers using a continuously adjustable crossover and dedicated volume controls
Improving low-end impact and clarity with a selectable phase inversion switch (0/180°)
Convenient everyday operation with auto on/off standby (deselectable) and low stand-by consumption
Elevating room aesthetics with Italian design, premium finishes, and a leather top with Sonus faber branding
Sonus faber Gravis I Full Specifications:
Product name: Sonus faber Gravis I
Type: Powered subwoofer
System / Enclosure: Closed box loading, down firing active subwoofer
Driver / Loudspeaker: 1 × Ø 210 mm (8") very long throw / long throw woofer; treated paper cone; wide rubber surround LF unit
Amplifier topology / type: High linearity Class AB
Amplifier power: 150 W RMS (nominal), 250 W peak
Frequency response: @ -6 dB, from 30 Hz to Fc (user adjustable)
Can I adjust the crossover to match my main speakers?
Yes. The crossover is continuously adjustable from 30 to 120 Hz with a 24 dB/oct slope for smooth blending.
Does it have separate controls for home theater LFE and normal listening?
Yes. It includes independent Master and LFE volume controls so you can fine-tune levels for different sources and setups.
How do I correct phase issues in my room?
Use the 0/180° phase inversion switch to help align bass timing and improve low-frequency integration at the listening position.
Does the subwoofer turn on and off automatically?
Yes. It includes an auto on/off function that can be disabled if you prefer manual power control.
Is Gravis I suitable for smaller rooms?
Absolutely - its compact cabinet, sealed alignment, and adjustable controls make it ideal for smaller listening spaces while still delivering impactful depth.
Reviews
Product Description
Product Description
The Sonus faber Gravis I is a compact powered subwoofer engineered for deep, controlled bass in smaller listening spaces. Its sealed, down-firing design and 210 mm (8") long-throw driver deliver tight low-end performance that blends naturally with stereo and home theater systems. A high-linearity Class AB amplifier provides 150 W RMS power, while adjustable crossover, phase control, and dual volume controls make integration easy and precise. With premium Italian design finishes and flexible inputs including LFE, RCA line, and Speakon high-level, Gravis I is an elegant upgrade for impactful bass.
Get the Details
Features & Specs
Features & Specs
Sealed, down-firing enclosure for precision bass:
The closed-box alignment keeps bass fast and controlled, while the down-firing layout helps distribute low frequencies smoothly in compact rooms.
Long-throw 210 mm (8") driver for real low-end authority:
The treated paper cone and wide rubber surround are built for extended excursion, producing deeper bass with clean articulation.
High-linearity Class AB power for musical impact:
With 150 W RMS and 250 W peak output, the amplifier delivers dynamic punch while maintaining refined control at everyday listening levels.
Full tuning toolset for perfect blending:
Dial in the crossover from 30–120 Hz, use the 24 dB/oct slope for a cleaner handoff to your mains, and flip 0/180° phase to tighten alignment in your room.
Easy integration with nearly any system:
Use LFE for AV receivers, line-level RCA for traditional setups, or Neutrik Speakon high-level input when you want the subwoofer to follow your amplifier’s sonic character.
Design-forward finishes with Sonus faber craftsmanship:
Multiple cabinet finish options and a leather top bring a luxury look that complements high-end systems and modern interiors.
Sealed, down-firing enclosure for precision bass:
The closed-box alignment keeps bass fast and controlled, while the down-firing layout helps distribute low frequencies smoothly in compact rooms.
Long-throw 210 mm (8") driver for real low-end authority:
The treated paper cone and wide rubber surround are built for extended excursion, producing deeper bass with clean articulation.
High-linearity Class AB power for musical impact:
With 150 W RMS and 250 W peak output, the amplifier delivers dynamic punch while maintaining refined control at everyday listening levels.
Full tuning toolset for perfect blending:
Dial in the crossover from 30–120 Hz, use the 24 dB/oct slope for a cleaner handoff to your mains, and flip 0/180° phase to tighten alignment in your room.
Easy integration with nearly any system:
Use LFE for AV receivers, line-level RCA for traditional setups, or Neutrik Speakon high-level input when you want the subwoofer to follow your amplifier’s sonic character.
Design-forward finishes with Sonus faber craftsmanship:
Multiple cabinet finish options and a leather top bring a luxury look that complements high-end systems and modern interiors.
Expert Insight
Expert Insight
Gravis I delivers impressively tight and musical bass for its compact size, adding depth without overpowering the rest of the system. Integration is straightforward thanks to flexible inputs, adjustable crossover controls, and a useful phase switch for room matching. The refined finish quality and premium details make it feel like a true high-end component in both sound and appearance.
Nate M
Brand Manager
Details
Details
Sonus faber Gravis I Compact High-Performance Powered Subwoofer
Sonus faber Gravis I is a compact, high-performance powered subwoofer designed to bring deep, controlled bass to smaller rooms without overwhelming your space. Built around a sealed, down-firing design and a long-throw 210 mm (8") woofer, it delivers tight, musical low-end extension that blends naturally with stereo and home theater systems alike. With a high-linearity Class AB amplifier and flexible connection options—including LFE, line-level RCA, and high-level Speakon inputs—you can integrate Gravis I into nearly any setup, from bookshelf speakers to full AV systems. Finished with Sonus faber’s signature Italian craftsmanship, it pairs elegant cabinet options with a premium leather top, making it as visually refined as it is sonically capable.
What It's Good At:
Delivering tight, musical bass in smaller listening rooms without boominess
Seamless integration with stereo and home theater systems via LFE, RCA line, or high-level Speakon inputs
Fine-tuning blend with main speakers using a continuously adjustable crossover and dedicated volume controls
Improving low-end impact and clarity with a selectable phase inversion switch (0/180°)
Convenient everyday operation with auto on/off standby (deselectable) and low stand-by consumption
Elevating room aesthetics with Italian design, premium finishes, and a leather top with Sonus faber branding
Sonus faber Gravis I Full Specifications:
Product name: Sonus faber Gravis I
Type: Powered subwoofer
System / Enclosure: Closed box loading, down firing active subwoofer
Driver / Loudspeaker: 1 × Ø 210 mm (8") very long throw / long throw woofer; treated paper cone; wide rubber surround LF unit
Amplifier topology / type: High linearity Class AB
Amplifier power: 150 W RMS (nominal), 250 W peak
Frequency response: @ -6 dB, from 30 Hz to Fc (user adjustable)
Can I adjust the crossover to match my main speakers?
Yes. The crossover is continuously adjustable from 30 to 120 Hz with a 24 dB/oct slope for smooth blending.
Does it have separate controls for home theater LFE and normal listening?
Yes. It includes independent Master and LFE volume controls so you can fine-tune levels for different sources and setups.
How do I correct phase issues in my room?
Use the 0/180° phase inversion switch to help align bass timing and improve low-frequency integration at the listening position.
Does the subwoofer turn on and off automatically?
Yes. It includes an auto on/off function that can be disabled if you prefer manual power control.
Is Gravis I suitable for smaller rooms?
Absolutely - its compact cabinet, sealed alignment, and adjustable controls make it ideal for smaller listening spaces while still delivering impactful depth.
