DEVIALET Phantom Ultimate 108 dB Deep Forest

Ten years after disrupting the norms of high-fidelity, Devialet rewrites its own legend with the Phantom Ultimate 108 dB. This French wireless speaker combines 1100 watts of power, 108 decibels of sound pressure, and a frequency response that drops down to 14 Hz—technical performance that defies the laws of physics for an 11-kilogram object. Driven by a new generation of drivers and an NXP iMX8 processor, this ovoid sphere turns every listening session into a sensory phenomenon where sound is felt as much as it is heard.

Physical configuration and build: when form serves function

The Phantom Ultimate 108 dB retains the spherical silhouette that has become Devialet’s signature, but this shape is anything but arbitrary. The ACE (Active Cospherical Engine) geometry enables omnidirectional sound dispersion while minimizing diffraction. With dimensions of 246 mm wide, 342 mm deep, and 255 mm high, the speaker occupies a surprisingly compact volume given its acoustic capabilities.

The bi-injected composite structure combines multiple materials in a sophisticated construction. The outer ABS layer offers a soft-touch finish while ensuring the necessary rigidity. Beneath it, a layer of fiberglass-reinforced polycarbonate adds density and inertia to absorb vibrations. At the core, an injected aluminum spine serves as the backbone. This centerpiece, redesigned for this generation, fulfills several functions: it mechanically supports the drivers subjected to considerable forces, dissipates heat generated by the electronics, and helps eliminate parasitic resonances.

The new-generation drivers represent a significant evolution. The aluminum-dome tweeter benefits from a reworked grille with a 13% higher open area ratio, the result of six months of research. The midrange, also with an aluminum dome, adopts a coaxial configuration with the tweeter for optimal phase coherence. The two ABS-dome woofers are mounted in a push-push (back-to-back) configuration, a layout that cancels mechanical vibrations while doubling acoustic efficiency. The absence of a dust cap on the woofers, visible in this generation, necessitated a complete redesign of the suspension and motor assembly to achieve a slimmer profile without compromising excursion.

Three finishes are available. Light Pearl dresses the speaker in matte pearlescent white with chrome metal plates, creating a subtle play with light. Deep Forest wraps the sphere in a deep, almost black green, accentuating its monolithic character. The Opéra de Paris edition, adorned with genuine 22-carat gold leaf, elevates the technical object into a luxury piece.

Embedded technologies: a technological arsenal in service of emotion

The Phantom Ultimate 108 dB concentrates seven proprietary technologies protected by four new patents. The new-generation ADH remains the cornerstone of the system. This hybrid amplification brings together on a single circuit a Class A analog amplifier, guardian of linearity and musicality, with four Class D digital amplifiers that deliver power and efficiency. Real-time processing has been optimized to maintain perfect synchronization even at extreme frequencies, reaching 35 kHz with a THD+N of just 0.0005%.

SAM (Speaker Active Matching) continuously analyzes the audio signal and adapts in real time the voltage sent to each driver. For each sample of the signal, the system precisely calculates the voltage needed so that the reproduced sound pressure is the exact image of the original signal. This active correction maintains phase and amplitude with surgical precision across the entire bandwidth, which is particularly critical in the bass, where cones travel several centimeters.

HBI (Heart Bass Implosion) is the most visually spectacular innovation. This suite of multiphysics innovations allows the lateral woofers to pulse with an amplitude visible to the naked eye, creating a hypnotic spectacle synchronized with the music. The convex woofer diaphragms increase internal acoustic pressure, enabling a reach down to 14 Hz—a frequency so low it is felt physically more than heard. This technology turns the speaker into a true pressure-wave machine that quite literally washes over the listener.

AVL (Adaptive Volume Level), borrowed from the Devialet Dione soundbar, provides real-time dynamic equalization. The system continuously analyzes content to subtly adjust the frequency response according to listening volume, preserving tonal balance even at low levels. This ensures that the subtle details of a whispered dialogue remain as intelligible as the most intense moments of an action soundtrack.

The Magic Wire DAC optimizes the signal path from digital to converters, minimizing jitter and electromagnetic interference. The Devialet ASIC (Application-Specific Integrated Circuit) integrates the entire signal processing chain on a dedicated chip, enabling minimal latency and optimized energy consumption.

Connectivity and operating system: intelligence serving simplicity

The brain of the Phantom Ultimate 108 dB is an NXP iMX8 processor, a multicore ARM Cortex chip designed for demanding multimedia applications. This processor runs DOS 3 (Devialet Operating System), the third generation of the in-house OS. This software platform manages all audio streams, streaming protocols, and synchronization between multiple speakers with imperceptible latency.

Wireless connectivity reaches a new level with Wi‑Fi 6 (802.11ax) in a 2×2 MIMO configuration on the 2.4 and 5 GHz bands. This standard delivers increased stability, reduced latency, and the ability to handle multiple simultaneous streams without degradation. Bluetooth 5.3 with A2DP and AVRCP profiles supports SBC and AAC codecs. The absence of high-definition codecs like aptX or LDAC is a limitation for Bluetooth sources, but network protocols more than make up for it.

The streaming protocol arsenal covers all modern uses. AirPlay lets Apple users stream directly from their devices, though limited to 16-bit/44.1 kHz. Google Cast goes up to 24-bit/96 kHz for Android users. Spotify Connect and Tidal Connect offer native integration with these services. UPnP support allows streaming from any DLNA server on the local network. Roon Ready (RAAT) certification will delight audiophiles using this sophisticated music management system.

Wired connectivity is kept to the essentials: a Gigabit RJ45 Ethernet port for a stable network connection and a TOSLINK optical input accepting up to 24-bit/192 kHz. The lack of analog RCA ports or an HDMI ARC input limits integration options in some setups, and the previously offered Arch box is not compatible with this generation.

User interface and app: control at your fingertips

The physical interface on the top of the shell features four capacitive touch sensors arranged in a cross. The volume + and − controls allow quick adjustment, the play/pause button manages playback, and a fourth button activates Bluetooth pairing. A central LED indicator communicates the speaker’s status: off, blinking during startup, solid white in operation. This minimalist interface favors visual elegance while offering essential controls.

The Devialet app, completely redesigned for this generation, becomes the nerve center of the experience. The six-band equalizer allows fine-tuning of the sound signature to suit preferences or room acoustics. Three preconfigured audio modes automatically adapt processing: Music Mode preserves neutrality to respect artistic intent; Movie Mode widens the soundstage and emphasizes effects; Podcast Mode optimizes vocal intelligibility.

Stereo pairing transforms two Phantom Ultimate 108 dB units into a compact hi‑fi system. Pairing is done directly from the app, with synchronization between speakers managed by the Devialet DOS 3 Sync protocol at 96 kHz/24-bit. The additional 3 dB of acoustic gain and, above all, the creation of a true stereo image elevate the mono experience.

The multiroom mode lets you create independent or synchronized listening zones. Each Phantom can play different content or join a group for synchronous playback throughout the home. Adjustable A/V latency ensures perfect lip-sync when watching films. Night mode intelligently tames low frequencies to maintain neighborly peace without skewing tonal balance.

The Devialet Remote, sold separately, offers precise physical control via a premium rotary wheel. A proximity sensor on the speaker automatically detects the remote to simplify pairing. In a stereo setup, a single remote can control both speakers.

Measured acoustic performance: the numbers behind the sensation

The maximum sound pressure of 108 dB SPL measured at 1 meter under 1 kHz puts the Phantom Ultimate on par with a chainsaw in terms of raw loudness. This ability to generate considerable sound pressure in a 6-liter volume defies acoustic conventions. The frequency response extends from 14 Hz to 35 kHz (±6 dB), covering well beyond the human audible spectrum. The plunge to 14 Hz deserves special attention: at this infrasonic frequency, sound becomes pure vibration, creating a physical sensation of chest compression.

The noise floor measured at 0 dB SPL at 1 meter reflects meticulous electronic design, allowing micro-details to emerge even at low volume. Total harmonic distortion plus noise (THD+N) of 0.0005% rivals the most expensive high-fidelity electronics. 32-bit/96 kHz digital processing preserves the resolution of high-definition sources throughout the processing chain.

Directivity remains controlled up to about 8 kHz thanks to the coaxial tweeter/midrange design. Beyond that, the polar pattern gradually narrows, a phenomenon inherent to any single-body speaker. This characteristic influences optimal placement: a position between 45 and 90 cm off the floor maximizes impact, while a minimum 30 cm clearance from the wall allows low frequencies to develop naturally.

Technical specifications

Audio performance

• Amplifier power: 1100 W
• Maximum sound pressure level: 108 dB SPL @ 1 m
• Frequency response: 14 Hz – 35 kHz (±6 dB)
• Noise floor: 0 dB SPL @ 1 m
• Digital processing: 32‑bit / 96 kHz DSP
• Audio inputs: up to 24‑bit / 192 kHz

Drivers

• 1 aluminum‑dome tweeter (new generation)
• 1 aluminum‑dome midrange (new generation)
• 2 ABS‑dome woofers (new generation)

Exclusive technologies

• ADH (analog/digital hybrid amplification) – new generation
• SAM (Speaker Active Matching)
• HBI (Heart Bass Implosion)
• AVL (Active Volume Level)
• DAC Magic Wire
• Devialet ASIC
• Devialet Operating System (DOS 3)

Connectivity and streaming

• Wi‑Fi: Wi‑Fi 6 (802.11a / b / g / n / ac / ax, 2×2 MIMO, 2.4 and 5 GHz)
• Ethernet: RJ45 Gigabit (100 / 1000 Mbps)
• Inter‑speaker connection: Devialet DOS 3 Sync. Protocol (96 kHz / 24‑bit)
• Optical input: 1× TOSLINK
• Bluetooth: 5.3 (A2DP and AVRCP profiles, SBC and AAC codecs)
• Streaming compatibility: AirPlay, Google Cast, Spotify Connect, Tidal Connect, UPnP, Roon Ready (RAAT)

Design and materials

• Configurations: mono / stereo (paired)
• Structure: dual‑injected composite enclosure (ABS + glass‑fiber‑reinforced polycarbonate, central core in die‑cast aluminum)

Dimensions and weight

• Speaker: 246 × 342 × 255 mm (W × D × H)
• Weight: 11.1 kg (speaker only) – 12.3 kg (packaging)

Power

• Voltage: 100–240 V~, 50 / 60 Hz
• Power consumption: off < 0.5 W | standby < 2 W

In the box

• Devialet Phantom Ultimate 108 dB speaker
• Power cable
• Documentation