Originating from the prestigious Italian high-end audio brand Unison Research—founded in 1987 by electronics engineer Giovanni Maria Sacchetti—the company has long been renowned for producing exceptional valve amplifiers. Hailing from Treviso, the brand has consistently upheld the practice of designing, manufacturing, and testing its products entirely in its own Italian factory, seamlessly blending authentic handcrafted artistry with modern engineering techniques. It stands as an iconic representation of Italian craftsmanship in the European high-end audio market.

Among Unison Research’s extensive product portfolio, the Unico series stands out as the most iconic and longest-standing family of hybrid amplifiers. Now, this classic line welcomes its new flagship—the Unico PRE v2 preamplifier and Unico DM v2 power amplifier—ushering the Unico series into a brand-new era.

Unico PRE v2: A Contemporary Paradigm of the Versatile Preamplifier
The Unico PRE v2 is a fully balanced, hybrid preamplifier employing a zero-negative-feedback three-stage architecture. Its first stage utilizes two ECC83/12AX7 Gold Lion vacuum tubes operating in pure Class A, delivering the characteristic warmth, refinement, and rich musicality of valves; the subsequent transistor buffer and output stages ensure precise signal control and extremely low distortion. This “tube-front, transistor-rear” design philosophy endows the PRE v2 with both the emotional warmth of a valve amplifier and the precision control of a solid-state design.

In terms of functional integration, the PRE v2 stands as a true all-rounder among contemporary preamplifiers. It incorporates a high-specification DAC module based on the Sabre ES9018K2M conversion chip, supporting USB input up to 384kHz PCM and native DSD256 playback. It is also equipped with MM/MC phono amplification, featuring a passive RIAA equalization circuit and high-precision components, with adjustable loading and gain on the rear panel. Analogue inputs include multiple RCA and XLR connectors, while outputs comprise balanced XLR, two sets of RCA, and a subwoofer output. Whether you are a vinyl enthusiast, a digital streamer, or a lover of traditional analogue sources, the PRE v2 integrates them all with finesse.

Aesthetically, the PRE v2’s front panel is precision-machined from a solid 15mm-thick aluminium billet via CNC, available in Midnight Black and Velvet Gold finishes. The top cover combines a 2mm aluminium sheet with wooden inlays, echoing the classic Unico emblem and embodying the brand’s consistent Italian flair. Notably, the Unison Research logo itself doubles as the power switch button, ingeniously merging functionality with brand identity. A 2.4-inch OLED display further enhances the user experience with convenient control and visual feedback.

Unico DM v2: The Perfect Union of Innovative Technology and Commanding Power
If the PRE v2 is the soul of the system, the Unico DM v2 is the powerhouse that underpins everything. The DM v2 employs a sophisticated dual-mono architecture, with each channel equipped with its own 750VA toroidal transformer, potted and shielded to significantly reduce electromagnetic interference. This design ensures complete channel separation, delivering a wide, stable, and three-dimensional soundstage.

In terms of amplification topology, the DM v2’s three-stage design is equally impressive: the first stage is a pure Class A valve stage employing two ECC82/12AU7 Gold Lion tubes as the sonic core; the second stage is a transistor buffer; and the final power output stage utilizes three pairs of parallel complementary MOSFETs, providing formidable current delivery.

However, the most striking highlight of the DM v2 is Unison Research’s first-ever implementation of A.S.H.A. (Analog Synchronized Hybrid Amplification) technology. This innovative approach gives rise to an entirely new proprietary output stage topology—Class A-AB—which masterfully combines the musicality and harmonic richness of pure Class A with the efficiency, stability, and reliability of Class AB. Distortion levels are so low as to be virtually inaudible to the human ear, remaining stable even near maximum output.

In terms of power output, the DM v2 delivers 220 watts (into 8 ohms) and 340 watts (into 4 ohms) in stereo mode, and can stably drive loads down to 2 ohms. According to real-world measurements, actual performance even surpasses the official specifications, reaching 240 watts (into 8 ohms) and 405 watts (into 4 ohms). When switched to bridged mono mode, it can provide a sustained output of up to 650 watts. Under dynamic conditions, peak power into a 2-ohm load reaches 782 watts, with a maximum current output of 19.8A. Whether driving bookshelf monitors or large floor-standing loudspeakers, the DM v2 handles them all with effortless authority.

Visually, the DM v2 shares the same design language as the PRE v2: a 15mm-thick aluminium front panel, a 2mm aluminium top cover, wooden inlays, and the same two finish options. When paired together, the entire system presents a harmoniously unified visual presence, exuding understated yet confident Italian elegance.

A Match Made in Heaven: The Ultimate Presentation of Musicality
When used together, the PRE v2 and DM v2 form a reference-grade flagship amplification system. The sonic character of this combination is not the thick, syrupy “tube sound” that many might imagine. On the contrary, what astonishes most is its formidable power and dynamic prowess. When the musical material calls for sweetness and richness, it reveals the characteristic warmth and fullness of valves; yet when the music demands precision and neutrality, it refrains from excessive colouration or embellishment. As one reviewer aptly put it: “This is what any Hi-Fi system should aspire to—to present music in its unadorned, truthful state.”

On a technical level, the PRE v2’s zero-negative-feedback design ensures ultimate transparency and linearity, while the DM v2—with its output impedance as low as 0.002Ω and low-frequency extension below 1Hz—exerts a vice-like grip on loudspeakers, akin to an “infrasonic clamp.” Together, they deliver a musical experience that combines emotional depth, dynamic authority, and breathtaking spatial openness.

The Unison Research Unico PRE v2 and DM v2 represent the Italian audio craftsmanship flagship manifesto for 2026. They are not mere specification upgrades but a comprehensive evolution spanning exterior design and internal circuitry. The PRE v2, with its tube-based preamplification coupled with integrated DAC and phono stage, serves as the perfect command centre for any system; the DM v2, with its innovative A.S.H.A. technology and dual-mono architecture, delivers unstoppable driving force and exquisite musicality.

This is a system crafted for true connoisseurs who deeply appreciate the beauty of music—no gimmicks, no superfluous ornamentation, only an unwavering commitment to musical reproduction. If you seek a state-of-the-art pre/power combination that authentically conveys musical emotion while possessing modern driving capabilities, the Unico PRE v2 and DM v2 deserve your personal audition.