Unison Research Unico Pre V2 Hybrid Preamplifier

The Unison Research Unico Pre V2 is a fully balanced hybrid preamplifier that pairs Gold Lion ECC83 tubes with a zero-feedback, dual-mono circuit topology for signal purity that solid-state alone cannot achieve. Its redesigned three-stage architecture delivers exceptional detail and dynamics while a built-in ESS Sabre DAC and MM/MC phono stage make it a complete system hub, all handcrafted in Italy with a 15mm machined aluminum front panel that introduces a new design language for the Unico family.

Key Features of the Unico Pre V2

• Fully Balanced Dual-Mono Architecture: Separate signal paths for each channel eliminate crosstalk and deliver a wide, stable soundstage with precise imaging. Both the phono stage and DAC section are implemented as dual-mono circuits.
• Gold Lion ECC83/12AX7 Tube Input Stage: The first gain stage uses a matched pair of Gold Lion tubes operating in Class A, defining the amplifier's sonic character with outstanding signal purity and low noise.
• Zero Global Feedback Design: With 0 dB of global feedback, the circuit preserves the natural dynamics and harmonic structure of the original signal without the phase distortion that feedback introduces.
• ESS Sabre ES9018K2M DAC (Dual-Mono): Integrated high-resolution DAC with dual-mono balanced output architecture supports PCM up to 384 kHz, native DSD up to 256x, and DoP up to 128x. USB input is driverless on Windows 10 and newer, no software installation required.
• Built-In MM/MC Phono Stage: Dual-mono passive RIAA equalization with high-precision components and selectable load and gain settings accommodates both moving magnet and moving coil cartridges.
• Extensive Connectivity: Six analog line inputs (3 RCA, 3 XLR), five digital inputs (USB, 2 Toslink, 2 S/PDIF), phono input, and multiple output options including dual subwoofer outputs.
• High Output Voltage: 8V RCA and 16V XLR outputs provide substantially more drive than most preamplifiers, ensuring clean signal delivery to any power amplifier regardless of cable length or input sensitivity.
• Class A Operation: The entire preamplifier circuit operates in Class A for the lowest possible distortion and most natural signal handling.
• R2R Resistor Ladder Volume Control: Instead of a traditional potentiometer, the Pre V2 uses an integrated circuit based on an R2R resistor ladder network for precise, repeatable volume steps with perfect channel balance across the entire range.
• 15mm Machined Aluminum Front Panel: CNC-machined from a solid aluminum block, with wooden inserts referencing the historic Unico identity and the Unison Research logo doubling as the power button.
• 12V Remote Power Trigger: Dedicated trigger output for automated power-on of companion amplifiers, including the Unico DM V2.

Hybrid Circuit Architecture

The Unico Pre V2 employs a completely redesigned three-stage circuit architecture built around Unison Research's long-standing philosophy of zero global feedback and dual-mono topology. The first stage uses a pair of Gold Lion ECC83/12AX7 valves operating in pure Class A, establishing the sonic signature with exceptional signal purity, extremely low distortion, and remarkably quiet operation. The subsequent solid-state stages operate in perfect synergy with the valve section, adding current drive and output capability without compromising the tube stage's musicality. This hybrid approach captures the harmonic richness of tubes in the critical voltage gain stage while relying on solid-state devices for the current delivery and low output impedance needed to drive long cables and complex loads.

Built-In ESS Sabre DAC

A fully integrated digital section centers on the ESS Sabre ES9018K2M converter implemented in a dual-mono balanced output architecture that feeds directly into the preamplifier's analog signal path. Unison Research designed the DAC board with the same dual-mono philosophy as the rest of the preamplifier, and the result is a built-in DAC that performs well above what most buyers expect from an integrated section. The USB input handles PCM signals up to 384 kHz and native DSD up to 256x (with DoP support up to 128x), making the Pre V2 compatible with virtually any high-resolution digital source. On Windows 10 and newer, the USB input is completely driverless, working natively without any software installation, the same plug-and-play experience Mac users have always had. Two Toslink and two S/PDIF coaxial inputs support signals up to 192 kHz, providing connection points for CD transports, streaming devices, and televisions without requiring a separate DAC component.

MM/MC Phono Stage with Passive RIAA

The built-in phono stage uses passive RIAA equalization with high-precision components in a dual-mono configuration for accurate, low-noise vinyl playback. This is a meaningful upgrade from previous Unico preamplifiers, where the phono section was less refined. Rear-panel DIP switches allow independent load and gain adjustment for both left and right channels, accommodating everything from high-output moving magnet cartridges to low-output moving coils. This dedicated phono input means the Pre V2 can serve as the center of a vinyl-focused system without an external phono preamplifier.

R2R Resistor Ladder Volume Control

Rather than a traditional potentiometer, the Unico Pre V2 uses an integrated circuit based on an R2R resistor ladder network. This design eliminates the channel imbalance that plagues conventional pots at low volume settings and provides extremely accurate, repeatable attenuation steps across the entire range. The result is a volume control that tracks perfectly between channels from the first click to full output, preserving spatial imaging and tonal balance regardless of listening level. The infrared volume control system also enables seamless remote operation.

A Complete System Starting Point

The Pre V2's built-in DAC and phono stage make it possible to build a high-performance separates system with fewer boxes. Pair the Pre V2 with its natural companion, the Unico DM V2, and you have a fully featured system that only needs a source and speakers. The phono stage handles your turntable, the DAC handles your streamer or computer, and six analog line inputs accommodate everything else. As your system evolves, the Pre V2 accommodates upgrades: add a dedicated phono preamplifier or external DAC whenever you're ready, and the Pre V2 simply becomes the switching hub and gain stage that ties it all together.

Unico Pre V2 Connectivity and System Integration

The Pre V2's rear panel reflects its role as a system command center. Three RCA and three XLR balanced line inputs handle any combination of analog sources, while the phono input adds a dedicated analog connection point. The five digital inputs (USB-B, 2 Toslink, 2 S/PDIF) cover everything from computer audio to streaming devices to disc transports like the Unico CD Due. Output options include two RCA pairs (up to 8V), one XLR balanced output (up to 16V), a dedicated line output, and dual subwoofer outputs for systems with powered bass. Those output voltages are significantly higher than most preamplifiers on the market, ensuring the Pre V2 has no trouble driving any power amplifier to its full rated output, even over long cable runs. The 12V trigger output enables synchronized power-on with a companion power amplifier.

Italian Design and Build Quality

Handcrafted in Dosson di Casier, Italy, by A.R.I.A. srl, the Unico Pre V2 introduces a completely renewed design language for the Unico product family. The front panel is machined from a solid 15mm-thick aluminum block, flanked by signature wooden inserts that recall the historic Unico branding. A copper accent strip and the circular Unison Research logo (which doubles as the power button) add a distinctive detail that blends functionality with identity. The top cover is a single 2mm aluminum sheet that wraps the entire enclosure. Available in Midnight Black and Velvet Gold finishes, the Pre V2 pairs seamlessly with the Unico DM V2 power amplifier as a visually and sonically matched separates system.

The Unico Line: A.S.H.A. Across the Range

The Pre V2 and DM V2 are the first products in the new Unico generation, but the technology platform won't stay exclusive to the flagship separates. Unison Research is redesigning the entire Unico integrated amplifier lineup with A.S.H.A. (Analog Synchronized Hybrid Amplification), starting with three new models: a 100-watt, a 180-watt, and a 280-watt integrated, all featuring the same Leader/Follower MOSFET topology that eliminates crossover distortion. The first two are expected to begin production in Q3 2026, with the larger model following in early 2027. Each will include a slot for an optional streaming board supporting QOBUZ Connect, Tidal Connect, Spotify Connect, and Roon Ready via DLNA. A new Unico DS (Digital Streaming) source component combining a DAC, CD player, and streamer with a valve output stage is also in development.

Explore the Full Unison Research Unico Series

The Unico Pre V2 is the flagship preamplifier in Unison Research's Unico lineup. For listeners who prefer integrated amplification, the Unico series offers a complete range:

• Unico Primo - 75W hybrid integrated, the entry point to the Unico sound.
• Unico Nuovo - 95W hybrid integrated with built-in phono stage.
• Unico Due - 120W hybrid integrated with built-in phono, DAC, and USB.
• Unico 90 - 120W hybrid integrated for dedicated two-channel systems.
• Unico 150 - 150W flagship hybrid integrated amplifier.
• Unico DM V2 - 220W hybrid power amplifier, the Pre V2's natural companion.

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Unico Pre V2 Specifications