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Unison Research S6 Black Edition - Pure Class A Tube Amplification
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Unison Research S6 Black Edition - Pure Class A Tube Amplification
Unison Research S6 Black Edition - Pure Class A Tube Amplification
Black
22 Saint Kilda Road
22 Saint Kilda Road
Suite 2.02
St Kilda VIC 3182
Australia
Unison Research
S6 Black Edition
The S6 Black Edition amplifier is able to meet the needs of the most demanding users, featuring.
To improve the S6 we worked on its strengths and we went even further to achieve higher sound quality.
The circuitry has been revised in the signal path and power management, again surpassing the milestones already achieved in the S6. Power output is now 40W, 15% more than the standard model. The polarisation of the power output valves has been completely revised to eliminate the capacitor and cathode resistor.
The input selection circuit has been implemented using the same technology designed for our most valuable equipment and extreme care has been taken in the design of the ground paths and channel separation. The valuable audio signal, where possible, travels protected in high-quality coaxial cables.
All the new Black Edition series are equipped with 3 digital inputs USB,SPDIF and Toslink.
Key Features
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Pure Class A Operation
Produces a warm, natural sound with incredible midrange presence and emotional impact. -
6 x EL34 Valves
Generates 35W per channel of tube-driven magic—ideal for efficient speakers and intimate listening spaces. -
Upgraded Black Edition Design
Elegant black finish with subtle detailing, premium internal wiring, and fine-tuned component selection for enhanced performance and longevity. equipped with 3 digital inputs USB, SPDIF and Toslink. -
Handcrafted in Italy
Every S6 is meticulously built in Treviso by Unison Research’s skilled artisans, combining old-world craftsmanship with modern electrical precision. -
Simple Yet Sophisticated
Minimalist front panel with intuitive controls and a user-friendly layout, allowing music to take centre stage.
Why Choose the S6 Black Edition?
The Unison Research S6 Black Edition is ideal for audiophiles seeking tube magic with modern reliability. Its rich tonal character, dynamic soundstage, and refined presentation make it a standout in any serious HiFi system.
Paired with high-efficiency loudspeakers, the S6 brings out emotional detail, delicate textures, and tonal authenticity that solid-state amplifiers often struggle to reproduce.
| Output Power | 40 W on 6 Ω |
| Signal Valves | 2 × ECC83 Gold Lion |
| Output Power Valves | 3 × KT77 Gold Lion in parallel per channel |
| Input Selector | Relay Input Selector with Return GND Technology |
| Bias/Topology | Cathode Capacitor Less (CCL), no autobias; Bias adjustable per power valve |
| Noise | As noiseless as a solid-state amplifier |
| Operation Class | Pure Class A, ultralinear, 20% tap |
| Inputs | 4× RCA line, 1× USB, 1× SPDIF, 1× Toslink |
| Outputs | 1× subwoofer RCA (stereo) |
| Bandwidth (−1 dB) | 15 Hz – 30 kHz |
| Dimensions (W × D × H) | 35 × 49 × 22 cm |
| Weight | 25 kg |
User Reviews
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