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:
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Product name: Sonus faber Gravis I
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Type: Powered subwoofer
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System / Enclosure: Closed box loading, down firing active subwoofer
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Driver / Loudspeaker: 1 × Ø 210 mm (8") very long throw / long throw woofer; treated paper cone; wide rubber surround LF unit
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Amplifier topology / type: High linearity Class AB
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Amplifier power: 150 W RMS (nominal), 250 W peak
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Frequency response: @ -6 dB, from 30 Hz to Fc (user adjustable)
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Crossover control: Continuously adjustable 30–120 Hz; slope 24 dB/oct
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Volume controls: Independent Master and LFE volume controls
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Phase control: Signal phase inversion switch (0/180°)
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Auto power: Auto switch on/off (deselectable)
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Audio input / output: LFE mono RCA; LINE mono RCA; HIGH LEVEL Neutrik 4-pole Speakon©
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Mains input voltage: Factory selected, 120 Vac – 60 Hz or 230 Vac – 50 Hz
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Power consumption: 0.5 W (Stand-by); 200 W (Rated power)
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Decoupling system: Rubber pad
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Cabinet: Squared shape; Oper pore / matte / high gloss wood; Black leather
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Finishes (collection options): Walnut Wood; Wenge Wood; Matte White Lacquer; Piano Black Lacquer
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Product dimensions (H × W × D): 334 × 286 × 316 mm / unit; 13.1 × 11.2 × 12.4 in / unit
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Dimensions including feet (H × W × D): 334 × 286 × 316 mm including feet; 13.1 × 11.2 × 12.4 in including feet
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Dimensions with packaging (H × W × D): 447 × 437 × 418 mm / unit; 17.6 × 17.2 × 16.5 in / unit
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Net weight: 14 kg / unit (30.9 lb / unit); 14.5 kg (32 lb)
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Packaging weight: 17.6 kg / unit (38.8 lb / unit)
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Fuse: Factory selected; T4.0A (110 Vac, 60 Hz); T2.0A (230 Vac, 50 Hz)
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Supplied accessories: User manual / Owner’s manual; AC power cord; 10 m / 32.8 ft Neutrik Speakon© interconnection cable
Sonus faber Gravis I Q&A:
- What type of subwoofer is the Sonus faber Gravis I?
- Gravis I is a powered, sealed (closed-box) down-firing active subwoofer designed for tight, controlled bass in compact spaces.
- How powerful is the built-in amplifier?
- It uses a high-linearity Class AB amplifier rated at 150 W RMS (nominal) with 250 W peak output.
- What connections does Gravis I support?
- It supports LFE mono RCA, LINE mono RCA, and HIGH LEVEL Neutrik 4-pole Speakon© connections for flexible system integration.
- 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.
