DEVIALET Phantom Ultimate 108 dB Deep Forest stereo

Phantom Ultimate 108 dB is the latest iteration of Devialet’s sound sphere. This stereo speaker, launched in 2025, keeps the ovoid design of the previous generation and incorporates four specific patents aimed at optimizing sound reproduction in a compact form factor.

Proprietary technologies: when French innovation pushes the laws of physics

Phantom Ultimate 108 dB integrates seven exclusive technologies working in synergy to deliver sound of exceptional purity. The next-generation ADH (Analog Digital Hybrid) marks a major leap over previous versions. This technology now pairs a class A control stage with a class D power stage using gallium nitride components, which are more thermally efficient. The result: extended linearity up to 35 kHz in the high frequencies, total harmonic distortion reduced to 0.001%, and optimized energy consumption.

The SAM (Speaker Active Matching) system analyzes and corrects the amplitude and phase of the audio signal in real time. This technology instantly adapts the speaker’s response to the characteristics of the signal, ensuring absolute fidelity to the original recordings. The Ultimate version benefits from improved algorithms that even take into account variations in ambient temperature and humidity to maintain consistent sound quality.

HBI (Heart Bass Implosion) technology achieves a frequency response down to 14 Hz, well below the threshold of human auditory perception. The two 6-inch side woofers, mounted back-to-back in a push-push configuration, move in perfect sync with a maximum excursion of 26 mm. This setup generates pressure waves of palpable physical intensity, creating a unique visceral sensation where the bass is not only heard but literally felt throughout the body.

AVL (Adaptive Volume Level), initially developed for the Dione soundbar, intelligently normalizes sound levels across different content. This technology uses real-time dynamic EQ to automatically balance volume variations, especially useful when switching between sources or streaming services. The DAC Magic Wire, Devialet’s proprietary ASIC, and the DOS 3 operating system round out this technological arsenal, orchestrating everything with near-zero latency.

Build and acoustics: French precision in the service of sound

Each Phantom Ultimate 108 dB is built around a pressure-cast aluminum core that serves as a rigid chassis for all components. This structure is wrapped in a bi-injected composite shell combining an inner layer of fiberglass-reinforced polycarbonate for structural rigidity with an outer ABS layer for aesthetics and protection. This construction eliminates any parasitic vibrations, even at the highest volumes.

The three-way acoustic architecture features a next-generation aluminum-dome tweeter positioned at the center, surrounded by an annular midrange also in aluminum in a coaxial configuration. This layout ensures perfect time alignment between mid and high frequencies. The two side ABS-dome woofers, redesigned for this generation, feature a significantly slimmed profile thanks to a new suspension and motor. The absence of a dust cap on the cones improves robustness while preserving their exceptional excursion.

The ACE (Active Cospherical Engine) spherical form is more than an aesthetic choice: it is the optimal geometry for minimizing diffraction and ensuring omnidirectional sound dispersion. The new tweeter protection grilles offer a 15% larger open surface compared to the previous generation, improving transparency in the high frequencies. Reworked thermal interfaces enable 40% more efficient heat dissipation, allowing extended listening sessions at full power without performance degradation.

Interface and connectivity: intelligence in the service of simplicity

Phantom Ultimate houses an NXP i.MX8 Nano quad-core processor clocked at 1.5 GHz, delivering four times the computing power of the previous generation. This electronic brain runs Devialet’s in-house DOS 3 operating system, which simultaneously manages 32-bit/96 kHz audio processing and multiple streaming protocols with no perceptible latency.

The touch interface integrated on the top of each speaker includes four capacitive sensors and a status LED indicator. These controls allow direct management of play/pause, volume, and track navigation. The touch surface, invisible at rest, subtly lights up upon interaction, preserving the purity of the design while offering immediate responsiveness.

Wireless connectivity uses Wi‑Fi 6 (802.11ax with 2×2 MIMO on 2.4 and 5 GHz bands), reducing latency by 75% compared to Wi‑Fi 5 and improving stability in dense environments. Bluetooth 5.3 with SBC and AAC codecs ensures universal compatibility. Gigabit Ethernet guarantees an ultra-stable wired connection for complex multiroom setups. The TOSLINK optical input accepts signals up to 24-bit/192 kHz, ideal for connecting a TV or external audio source.

Streaming and ecosystem: the convergence of audio services

Phantom Ultimate 108 dB natively supports AirPlay 2, Google Cast, Spotify Connect, Tidal Connect, and UPnP, enabling direct streaming from your favorite apps. Roon Ready (RAAT) certification will satisfy music lovers with high-resolution local libraries. The Devialet DOS 3 Sync protocol ensures perfect synchronization between two speakers in a stereo setup with uncompressed 96 kHz/24-bit transmission.

The Devialet app (iOS/Android) centralizes setup and advanced settings. It offers three preset listening modes: Music for neutral reproduction, Cinema with expanded spatialization and dialogue enhancement, and Podcast optimizing vocal intelligibility. A six-band equalizer enables fine-tuned personalization of the sound signature. Night mode intelligently reduces low frequencies after 10 p.m. to keep the peace with your neighbors. The programmable sleep function can be set from 30 minutes to 12 hours.

The Devialet Remote V2, sold separately, provides precise physical control with its stainless-steel ring and matching matte white finish. It communicates via Bluetooth 5.0 BLE up to 20 meters and auto-syncs across multiple speakers. A single remote is enough to control a stereo pair, but multiple remotes can coexist and synchronize with each other.

Finishes and customization: French elegance

The Ultimate range comes in two distinct collections. The classic version offers Light Pearl (a matte off-white evoking biscuit porcelain) and Deep Forest (a deep, almost black green), both enhanced by chrome mirror-finished metal flanks. The Opéra de Paris edition, the fruit of a historic partnership with the prestigious institution, sports a luminous white with flanks covered in hand-applied 22-carat gold leaf.

Compatible accessories include the Treepod and Tree stands, which raise the speaker to optimal listening height, as well as the Gecko wall mount for discreet installation. The Cocoon carry case from the previous generation remains compatible, though the finishes may differ. Unfortunately, the Arch box with phono preamp from the previous lineup is not compatible with this new generation.

Stereo setup: the soundstage redefined

In a stereo configuration, two Phantom Ultimate 108 dB speakers create a remarkably expansive soundstage. The proprietary synchronization protocol ensures absolute phase coherence between the two speakers, essential for precise stereophonic imaging. The combined power of 2,200 watts RMS and the ability to generate 111 dB SPL create a sonic presence comparable to much larger systems.

The recommended optimal placement sets the speakers 1.5 to 2.5 meters apart, toed in by 35 degrees toward the listening position. A height of 45 to 90 cm off the floor maximizes impact, while a minimum of 30 cm from the wall allows low frequencies to develop naturally. Omnidirectional dispersion ensures a wide listening area, enabling multiple listeners to fully enjoy the experience.

Automatic calibration via the app analyzes your room’s acoustics and adjusts parameters to optimize reproduction. The expanded stereo mode creates enhanced spatialization for mono or poorly mixed recordings, while focus mode tightens the image for critical listening. Ultra-low latency enables perfect sync with video when watching movies or concerts.

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)
• Background noise: 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 (hybrid analog/digital 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: 1x TOSLINK
• Bluetooth: 5.3 (profiles A2DP and AVRCP, codecs SBC and AAC)
• Streaming compatibility: AirPlay, Google Cast, Spotify Connect, Tidal Connect, UPnP, Roon Ready (RAAT)

Design and materials

• Configurations: mono / stereo (paired)
• Structure: bi-injected composite enclosure (ABS + glass fiber–reinforced polycarbonate, central core in injected aluminum)

Dimensions and weight

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

Power supply

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

What’s in the box

• 2 Devialet Phantom Ultimate 108 dB speakers
• Power cable
• Documentation