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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.
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Professional Reviews 88/100
Nicely Roasted
Sound Quality
88/100
Build Quality
93/100
Value for Money
86/100
With near-silent Class-A operation, the S6 Black Edition pairs warm, finely textured mids with unusually tight bass and quick transient snap. Old Guy Hifi found it persuasive across sources and demanding speakers, while Audiophilepure highlights improved detail and DAC-equipped digital flexibility. Hand-matched KT77s and robust control give this Italian integrated genuine long-listen allure.
What Reviewers Are Saying
Pros
Exceptionally quiet, detailed and warmly textured presentation, with particularly convincing vocals and instrumental nuance.
Tight, articulate bass with quick drum attack and strong woofer control defies typical expectations of tube amplification.
Drove 4-ohm loudspeakers and Magnepan LRS Plus panels confidently despite its 40W rating.
Beautifully built, with hand-matched output tubes and thoughtfully executed engineering.
&
Cons
A slight extra dose of upper-treble energy was noted around the highest frequencies, though it was not considered fatiguing.
SOUND QUALITY PERFORMANCE 88/100
Reviewers describe an exceptionally quiet, detailed and warmly expressive presentation, with particularly persuasive voices, instrumental texture and bass definition. Its reported drive and musical ease are strong, although the supplied reviews offer little direct listening evidence about stereo width, depth or image specificity.
Transparency Resolution
93/100
Audiophilepure reports improved detail and an exceptionally low noise floor over the standard S6. Old Guy Hifi likewise calls it almost noiseless and praises the nuance, texture and proper rendering of instruments across the core musical range.
Tonal Balance Musicality
94/100
Old Guy Hifi found the S6 Black Edition beautiful and highly musical on every source tried, with excellent vocal reproduction. The amplifier is described as warmly detailed rather than sterile, delivering rich lower-midrange-to-treble texture without apparent tonal sins.
Dynamics
92/100
Despite its modest 40W rating, the amplifier was reported to keep bass tight, articulate and rhythmically convincing, with quick drums and clear attack. The reviewer also found it controlled woofers well and drove demanding 4-ohm and Magnepan speakers without trouble.
Soundstage Imaging
75/100
The manufacturer describes sound-scene reconstruction as a design aim, but the supplied listening reports do not directly assess stage width, depth, image focus or layering. There is therefore limited reviewer evidence on its spatial performance.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
Old Guy Hifi calls the amplifier beautifully built, with well-thought-out engineering and construction that makes the maker's care tangible. The hand-matched KT77 output-tube sets are a meaningful detail, while the pure-Class-A ultralinear circuit and individually adjustable valve bias indicate a serious execution.
Value for Money
86/100
At roughly $7,000, Old Guy Hifi considers it a beautifully built and amazing tube integrated amplifier. The review does not make direct comparisons with similarly priced rivals or explicitly judge its value against them, so the evidence on price competitiveness remains limited.
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Authorized dealers for Unison Research S6 Black Edition
- Absoulute Audio plus Video — in-store — Aiken, South Carolina, United States (website)
- Holt Hill — online and in-store — Andover, Massachusetts, United States (website)
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- Altitudo Audio — online and in-store — Winnipeg, Manitoba, Canada (website)
- Analog Matters — online and in-store — Ormond Beach, Florida, United States (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Assai Audio — in-store — Centro, Comunidad de Madrid, Spain (website)
- Atelier 13 Audio — in-store — Forest Hills, Tennessee, United States (website)
- Audio Centrum — Hungary (website)
and 72 more verified dealers