DEVIALET Phantom Ultimate 98 dB Deep Forest stereo

Phantom Ultimate 98 dB is the new generation of Devialet connected speakers. This compact acoustic sphere, designed and assembled in France, is the result of over 15 years of research and development. It delivers 400 watts of power in a volume under 3 liters, with sound reproduction spanning 18 Hz to 25 kHz.

A concentration of patented technologies in the service of sound

Phantom Ultimate 98 dB carries the full technological arsenal developed by Devialet since its creation in 2007. At the heart of this speaker beats the next-generation ADH (Analog Digital Hybrid) technology, an innovation that for the first time combines the refinement and linearity of Class A analog amplification with the power and energy efficiency of Class D digital amplification.

This hybridization works on a principle similar to power steering in a car: the analog amplifier dictates the output voltage with absolute precision, while the digital amplifiers supply the required current. The result? Amplification with no passive components in the audio signal path, a natural bandwidth extending up to 5 MHz, and zero thermal distortion thanks to constant dissipated power. The improved control algorithm between the analog and digital stages now achieves frequencies up to 25 kHz with remarkable clarity.

SAM (Speaker Active Matching) technology is the second pillar of this speaker. This algorithm adjusts the audio signal in real time to the physical characteristics of the drivers, preserving their acoustic signature while protecting them. SAM continuously analyzes transient and steady-state signals to reproduce phase and amplitude with razor-sharp precision, ensuring perfect time alignment between the recorded signal and the generated pressure wave.

The HBI (Heart Bass Implosion) system enables this compact speaker to reach down to 18 Hz in the infra-bass range. Two back-to-back, push-push aluminum woofers deliver powerful lateral excursion under high pressure in the sealed cabinet. This unique configuration produces bass with a striking physical impact you can feel as much as you can hear.

AVL (Adaptive Volume Level) technology, inherited from the Devialet Dione soundbar, dynamically adjusts EQ in real time according to the content. From whispered dialogue to cinematic explosions, every sonic detail retains its place in the mix without losing intelligibility.

Masterful construction for uncompromised acoustics

The construction of Phantom Ultimate 98 dB reflects a manufacturing approach where every detail matters. Its bi-injected composite shell pairs an inner layer of glass fiber–reinforced polycarbonate for structural rigidity with an outer ABS layer to absorb parasitic vibrations. At the center, an injected aluminum core serves as a backbone, capable of withstanding the colossal mechanical stresses generated by the drivers during dynamic passages.

Assembly is performed under 1.2 tons of pressure, ensuring perfect airtightness to aeronautical standards. The woofer gasket, 2.5 mm in diameter, is compressed with an equivalent force to guarantee total hermeticity of the sealed enclosure. This construction maintains consistent acoustic performance even during extended high-volume listening sessions.

The drivers themselves are feats of engineering. The full-range aluminum transducer reproduces mids and highs with optimized directivity, while the two stamped aluminum side woofers offer maximum radiating surface in minimal space. Each cone is individually tested prior to assembly to guarantee absolute compliance with acoustic specifications.

The manufacturing process includes 50 quality control tests, from individual components to the finished product. Every Phantom Ultimate goes through an anechoic chamber where its performance is measured and calibrated to match Devialet standards exactly. This manufacturing rigor, with 30% of production time dedicated to quality control, guarantees consistent performance from one unit to the next.

A connected ecosystem built for the streaming era

Phantom Ultimate 98 dB integrates seamlessly into the modern digital world thanks to the DOS 3 operating system, powered by a quad-core NXP i.MX 8M Nano SoC clocked at 1.5 GHz. This robust software platform handles all high-resolution streaming protocols available on the market.

Wireless connectivity relies on dual-band Wi-Fi 5 (2.4 and 5 GHz) with 2×2 MIMO for stable transmission even in congested environments. Bluetooth 5.2 with SBC and AAC codecs enables direct connection from any mobile device. The speaker natively supports AirPlay for the Apple ecosystem, Google Cast for Android, as well as Spotify Connect, Tidal Connect, and UPnP for direct access to streaming services.

Roon Ready (RAAT) certification places this speaker among audiophile-grade equipment compatible with this music management platform favored by discerning listeners. Inter-speaker synchronization via Devialet’s proprietary DOS 3 protocol allows stereo pairing with microsecond-level timing precision, creating a coherent, well-defined soundstage. In stereo configuration, the sound pressure level reaches 101 dB SPL, turning listening into a true sonic spectacle.

The mini-TOSLINK optical input accepts digital signals up to 24-bit/192 kHz, enabling direct connection to a high-resolution source. The Ethernet RJ45 port ensures a stable network connection for high-definition streaming without the vagaries of Wi‑Fi.

The completely redesigned Devialet app offers an intuitive interface for setup and control. Beyond basic operation, it includes a 6-band parametric EQ to fine-tune the sound to your room’s acoustics, a night mode to tame bass in apartments, and adjustable latency for perfect A/V sync in home theater use.

Iconic design and exceptional finishes

The spherical shape of Phantom Ultimate continues a visual signature that has become emblematic since 2015, while introducing subtle refinements. This geometry is more than aesthetic: it optimizes omnidirectional acoustic dispersion while minimizing internal standing waves. The metallic side flanges, available in glossy or matte finishes depending on the colorway, add sophistication while contributing to structural rigidity.

Three finishes are offered to suit different interiors. Light Pearl features a soft matte white reminiscent of ceramic bisque, with pearlescent side plates that subtly catch the light. Deep Forest offers a deep dark green, almost black depending on lighting, with shiny metallic accents. A special Paris Opera edition, stemming from the partnership initiated in 2017 with the prestigious institution, is adorned with real gold leaf on the sides, transforming the speaker into a sonic work of art.

Integrated capacitive touch controls on top provide direct control of volume, playback, and Bluetooth pairing without resorting to the app. A discreet LED indicator shows operating status: off, starting up (blinking), or operational (solid white). This ease of use belies the underlying technological complexity.

The visual spectacle of the moving side woofers is a Devialet signature. During bass-heavy passages, the convex cones pulse hypnotically, physically embodying the unleashed sonic energy. This mechanical ballet, visible from several meters away, turns listening into a multisensory experience.

Frequently Asked Questions

What’s the difference between Phantom Ultimate 98 dB and the previous Phantom II model? Phantom Ultimate brings substantial improvements over the Phantom II generation. The next-gen ADH offers better thermal and energy management, enabling more precise highs up to 25 kHz versus 21 kHz previously. The new NXP i.MX 8M processor and DOS 3 system deliver enhanced connectivity with the addition of Google Cast and Tidal Connect. New aluminum drivers replace the Phantom II 98 dB’s ABS units, offering better rigidity and reduced distortion. The internal structure with an injected aluminum core significantly improves mechanical stability under heavy load.

Which accessories are compatible with this speaker? Phantom Ultimate 98 dB is compatible with the Tree stand (sleek single-leg stand) and the Gecko wall mount for discreet installation. The Devialet Remote allows precise control without a smartphone. Accessories from the previous Phantom II range, such as the Cocoon carrying case, remain compatible despite potentially different finishes. Note that the Devialet Arch support is not compatible with this new generation. For optimal listening, Devialet strongly recommends using Treepod stands, which position the speaker at the ideal height while decoupling vibrations from the floor.

How can I optimize speaker placement in a room? Positioning plays a crucial role in acoustic performance. Place the speaker 45 to 90 cm off the floor to maximize impact and dispersion. Leave at least 30 cm from walls to allow low frequencies to develop naturally without creating troublesome standing waves. Keep the space in front of the speaker clear for optimal sound propagation. The ideal listening distance is between 1.5 and 2.5 meters. In a stereo setup, space the speakers 2 to 3 meters apart, forming an equilateral triangle with the listening position.

Is this speaker suitable for home theater use? Phantom Ultimate 98 dB excels in home theater thanks to several strengths. The optical input enables direct connection to a TV for sound far superior to built-in speakers. AVL technology automatically adjusts dynamics to balance dialogue and effects. The latency setting in the app ensures perfect lip-sync. In a stereo configuration, spatialization effectively reproduces cinematic atmospheres, even if it won’t replace a true multichannel system for surround purists.

Are software updates frequent? Devialet actively maintains the DOS 3 system with regular updates that bring new features and performance improvements. Updates install automatically via Wi‑Fi or can be triggered manually from the app. The track record shows the progressive addition of streaming protocols (Google Cast and Tidal Connect were absent at launch), audio features (6-band EQ), and acoustic optimizations. This evolutionary approach ensures your investment remains technologically cutting-edge, unlike traditional hi-fi systems fixed to their original specifications.

Technical specifications

Design and materials

• Configurations: mono or stereo (paired with another speaker)
• Bi-injected composite cabinet
  • Inner layer: glass fiber–reinforced polycarbonate
  • Outer layer: ABS
  • Die-cast aluminum central core

Exclusive technologies

• Next-generation ADH (Analog Digital Hybrid)
• SAM (Speaker Active Matching)
• HBI (Heart Bass Implosion)
• AVL (Active Volume Limiter)
• DAC Magic Wire
• Devialet ASIC
• DOS 3 operating system

Drivers

• 1 × aluminum full-range driver
• 2 × aluminum woofers

Audio performance

• Total amplification power: 400 W
• Maximum sound pressure level: 98 dB SPL at 1 m
• Frequency response: 18 Hz – 25 kHz (±6 dB)
• Noise floor: 0 dB SPL at 1 m
• Audio inputs: up to 24-bit/192 kHz
• DSP: 32-bit/96 kHz
• Processor: NXP i.MX 8M Nano SoC – Quad-core 1.5 GHz

Connectivity

• Wi‑Fi: Wi‑Fi 5 (802.11a/b/g/n/ac) – 2×2 MIMO (2.4 and 5 GHz)
• Ethernet: RJ45 (100/1000 Mbps)
• Inter-speaker connection: Devialet DOS 3 protocol (96 kHz/24-bit)
• Optical input: 1 × mini‑TOSLINK
• Streaming services
  • AirPlay
  • Google Cast
  • Spotify Connect
  • Tidal Connect
  • UPnP
  • Roon Ready (RAAT)
• Bluetooth 5.2 (A2DP and AVRCP profiles, SBC and AAC codecs)

Power

• Voltage: 100–240 V ~ 50 / 60 Hz
• Power consumption
  • Off: < 0.5 W
  • Standby: < 2 W

Dimensions and weight

• Speaker: 157 × 219 × 168 mm (W × D × H)
• Weight: 4.3 kg
• Packaging: 210 × 285 × 250 mm – 5 kg

Box contents

• 2 Devialet Phantom Ultimate 98 dB
• Power cable
• Documentation