Unison Research Unico 90 Integrated Amplifier

With the Unison Unico 90, Italian manufacturer Unison Research presents a hybrid integrated amplifier that combines tube warmth with the power of modern solid-state technology. The amplifier was developed for music lovers who value naturalness, emotional clarity, and long-lasting power reserves. The model has already received high praise in the trade press – Stereoplay magazine's 2017 review stated: "Rich, velvety sound. Very fine bass control. Elegant sound, spatially perfect imaging. Sounds well above its price. Outstanding."

Sound philosophy and construction principle

The heart of the Unico 90 is its hybrid circuit topology. The preamplifier features a Class A tube circuit with ECC83 and ECC81 dual triodes connected in a special multiple parallel totem pole. This stage shapes the amplifier's overall character: a velvety, detailed sound with the characteristic musicality of a tube.

The power amplifier, on the other hand, utilizes a Class AB design with complementary HEXFET transistors (four pairs per channel). Thanks to thermal stabilization and a special control system, the entire amplification is achieved in just two stages without global negative feedback. The result is an amplifier that not only vividly reproduces the finest nuances but also effortlessly maintains control even with complex speaker loads.

Technical care for the highest musicality

Unison Research deliberately uses short signal paths for the Unico 90 and completely avoids all-around negative feedback. This philosophy enables exceptionally direct, unadulterated reproduction. The amplifier combines power and control with a natural timbre variety that never becomes tiring, even during long listening sessions.

The output power is 2 x 120 watts at 8 ohms and 2 x 170 watts at 4 ohms—sufficient to drive even larger floorstanding speakers with ease. The frequency response ranges from 12 Hz to 45 kHz (-1 dB) or 6 Hz to 80 kHz (-3 dB), guaranteeing high-resolution, finely graded reproduction.

The distortion factor remains remarkably low even at high power levels (< 0.15% at 1 watt, < 0.30% at 100 watts), while the output impedance of less than 0.4 ohms ensures precise bass control.

Connection variety for flexible systems

The Unico 90 is equipped with practical features and can be seamlessly integrated into modern hi-fi systems. A total of six line-level inputs are available: three unbalanced RCA inputs, two balanced XLR inputs, and one unbalanced bypass input, for example, for home theater setups.

The device also features a tape output and a volume-controlled subwoofer output. A standard speaker terminal and bi-wiring terminals are provided for the speakers, allowing demanding users to individually optimize their cabling.

Design and workmanship

In typical Unison Research style, the Unico 90 combines Italian design with precision craftsmanship. The solid cabinet, measuring 435 mm wide, 440 mm deep, and 180 mm high, weighs 25 kilograms. This design already signals the internal stability of its circuitry. The maximum power consumption is 550 watts, underscoring the powerful power amplifier section.

The exterior is discreetly elegant: clear lines, high-quality controls and the front design typical of Unison make the Unico 90 a visual highlight in the living room.

Conclusion – Tube charm meets transistor power

The Unison Research Unico 90 is far more than a classic integrated amplifier. It's an audiophile statement that combines the emotional qualities of a tube preamp with the performance of a modern solid-state power amplifier. With its clear sonic signature, wide range of connections, and uncompromising craftsmanship, it's an ideal partner for discerning music listeners.

Anyone who values a combination of musical warmth, the finest detail resolution and powerful dynamics will find the Unico 90 a faithful companion that impresses far beyond its price range.