Unison Research Reference Monoblock Amplifiers; pair

Unison Research Reference Monoblock Amplifiers are the flagship power amplifiers from the legendary Italian manufacturer, delivering pure Class A performance in a massive, no-compromise design. Each monoblock is a statement piece, built to drive the most demanding speakers with authority, grace, and tonal beauty that only high-current tube amplification can achieve.

Key Features

• 80W pure Class A output: Massive tube power from four 845 triodes per monoblock
• Double parallel single-ended design: Preserves tonal richness and fluid dynamics under load
• Dual chassis construction: Separates power and signal stages for better noise isolation and performance
• Reference-grade tube complement: 4 x 845, 1 x ECC82, 1 x ECC83 per amp
• Bi-wiring speaker outputs: Connect using 4 or 8 ohm taps for optimal matching
• RCA and XLR inputs: Compatible with both balanced and single-ended preamps
• Flagship match: Engineered to pair with the Unison Research Reference Pre
• Italian-built, no-compromise design: Over 150 lbs of handcrafted detail and sonic authority

Flagship Power, Singular Purpose

Designed as the perfect match for the Reference Pre Preamplifier, each Unison Research Reference Monoblock operates in pure Class A with a double parallel single-ended output stage. Using four 845 triodes per amp, this design produces 80 watts of muscular, harmonically rich power with breathtaking control and musicality.

Handcrafted Dual-Chassis Construction

Each monoblock is assembled in two sections to isolate power and signal paths. The result is not just reduced interference and better signal integrity, but also a commanding presence both visually and sonically. The craftsmanship is exceptional, from the Italian woodwork and brushed metal to the meticulously selected internal components.

Tuned to the Demands of the Finest Systems

With switchable output taps for 4 or 8 ohms and both RCA and XLR inputs, the Reference Monoblocks adapt to high-end systems without compromise. The amps are designed to handle even the most complex speaker loads, delivering a soundstage that is deep, dimensional, and richly layered.

Tube Complement and Bias

Each monoblock is equipped with 4 x 845 output tubes, supported by 1 x ECC82 and 1 x ECC83 in the input/driver stage. Internal circuitry and thermal design allow for long-term tube stability and minimal maintenance, while still allowing seasoned tube enthusiasts to roll valves if desired.

Matched with the Unison Research Reference Pre

These amplifiers were born from the same engineering vision that created the Unison Research Reference Pre, and they perform best when paired together. View the Unison Research Reference Pre page to learn more.

Reference Monoblock Reviews

“When everything settles and the mind calms, what's left is music: vivid, beautiful, whole, and rendered with uncommon care. The Unison Reference amplifiers turn spending into savoring, and savor them I did.”

— Rogier van Bakel, Stereophile Read the full article at Stereophile

The Listening Room Difference

The Unison Research Reference Monoblock Amplifiers aren't the kind of products that get dumped precariously at your doorstep. At this level, white-glove matters. That’s why Michael Hoatson, owner of The Listening Room, personally hand-delivers and installs these units nationwide for free with purchase.

Mike works closely with every customer to ensure proper system integration, voltage matching, gain staging, and phono configuration. No shipping company will handle this preamp with the care and technical precision he brings to your door.

We’re a third-generation, family-owned high-end audio store based in Chestertown, Maryland. You’ll speak directly with us: no chatbots, no middlemen, no call centers. Just expert advice, unmatched service, and a shared passion for sonic perfection.

Have questions about pairing this with the right monoblocks, cartridges, or cabling? Call or email us anytime. We’re here for your entire hi-fi journey.

Specifications