DEVIALET Phantom Ultimate 108 dB Paris Opera

Ten years after upending the rules of high-fidelity, Devialet rewrites its own legend with Phantom Ultimate 108 dB. This French wireless speaker combines 1100 watts of power, 108 decibels of sound pressure, and a frequency response that reaches down to 14 Hz—technical performance that seems to defy the laws of physics for an object weighing 11 kilograms. Powered 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 experienced as much as it is heard.

Physical design and build: when form follows function

The Phantom Ultimate 108 dB retains the spherical silhouette that defines Devialet’s signature, but this shape is anything but arbitrary. Its ACE geometry (Active Cospherical Engine) 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 in light of its acoustic capabilities.

The bi-injected composite structure combines multiple materials in a sophisticated build. The outer ABS layer offers a soft-touch finish while ensuring the required rigidity. Beneath it, a layer of glass-fiber-reinforced polycarbonate adds density and inertia to absorb vibrations. At the core, an injected aluminum spine acts as the backbone. Redesigned for this generation, this keystone part serves 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 redesigned grille with a 13% higher open area ratio, the result of six months of research. The aluminum-dome midrange 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, canceling mechanical vibrations while doubling acoustic efficiency. The absence of a dust cap on the woofers, visible in this generation, required a complete overhaul of the suspension and motor to achieve a slimmer profile without compromising excursion.

Three finishes are offered. Light Pearl dresses the speaker in a matte pearlescent white with chromed metal side plates, creating a subtle interplay with light. Deep Forest wraps the sphere in a deep, almost black green, emphasizing 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

Phantom Ultimate 108 dB concentrates seven proprietary technologies protected by four new patents. The next-generation ADH remains the cornerstone of the system. This hybrid amplification combines, on a single circuit, a Class A analog amplifier—guardian of linearity and musicality—with four Class D digital amplifiers that provide power and efficiency. Real-time processing has been optimized to maintain perfect synchronization even at extreme frequencies, reaching 35 kHz with 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 every sample of the signal, the system precisely calculates the voltage required so that the reproduced sound pressure is an exact image of the original signal. This active correction maintains phase and amplitude with surgical precision across the full bandwidth, particularly critical in the low end where cones travel several centimeters.

HBI (Heart Bass Implosion) delivers the most visually striking innovation. This suite of multiphysics breakthroughs allows the lateral woofers to pulse with an amplitude visible to the naked eye, creating a hypnotic spectacle in sync with the music. The convex woofer diaphragms increase internal acoustic pressure, enabling extension down to 14 Hz—a frequency so low it is felt more than heard. This technology turns the speaker into a true machine for generating pressure waves that literally pass through the listener.

AVL (Adaptive Volume Level), derived from the Devialet Dione soundbar, provides real-time dynamic EQ. The system continually analyzes content to subtly adjust 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 DAC Magic Wire optimizes the signal path to the 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 power 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 brand’s third-generation 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 2×2 MIMO configuration across 2.4 and 5 GHz bands. This standard brings greater 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 hi-def codecs such as aptX or LDAC is a limitation for Bluetooth sources, but network protocols largely compensate.

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

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

User interface and app: fingertip control

The physical interface on the top of the shell features four capacitive touch sensors arranged in a cross. Volume + and – provide quick adjustment, the play/pause button controls playback, and a fourth button activates Bluetooth pairing. A central LED indicator communicates the speaker’s status: off, flashing during startup, solid white in operation. This minimalist interface prioritizes visual elegance while providing 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 your preferences or the room’s acoustics. Three preset audio modes automatically adapt processing: Music Mode preserves neutrality to respect artistic intent, Movie Mode widens the soundstage and enhances effects, and Podcast Mode optimizes vocal intelligibility.

Stereo configuration transforms two Phantom Ultimate 108 dB units into a compact hi-fi system. Pairing is done directly in the app, with synchronization between speakers handled 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 enables perfect lip-sync when watching films. Night mode intelligently tames low frequencies to keep the peace with neighbors 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 controls 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 Phantom Ultimate on par with a chainsaw in terms of sheer loudness. This ability to generate considerable sound pressure from a 6-liter volume defies acoustic convention. Frequency response spans 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 attests to meticulous electronic design, allowing micro-details to be extracted 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 signal chain.

Directivity remains controlled up to around 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 45 to 90 cm off the floor maximizes impact, while at least 30 cm of 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 (next generation)
• 1 aluminum dome midrange (next generation)
• 2 ABS dome woofers (next generation)

Exclusive technologies

• ADH (hybrid analog/digital amplification) – next 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: 1x 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)
• Cabinet: bi-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

What’s in the box

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