Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
Product Strengths
- It's 'one helluva integrated amplifier with its combined strengths of stiff power, agility, and heart'.
- It worked well with three very different speakers, lighting them up from bottom to top—making them sound their richest and boldest.
- The Unico 90 allowed the source to shine through, indicating very little character of its own.
- It offers superb control, feeling like there was an endless power reserve on tap.
- It has a musicality and energetic nature with liveliness and smoothness that managed to suck the reviewer right into the music.
Product Considerations
- The included remote could benefit from a redesign, as the buttons are tiny, all of the same shape, made out of hard plastic, not organized well, and uncomfortable to press.
- The Unico needs a bit of time to warm up, around 30 minutes, to sound right.
Comparisons (according to reviewers)
- Vs Leben CS600X integrated amp: The Leben had the upper hand when it came to richness, where tone colors were painted with more saturation, while also offering the Unico 90's sense of refinement and control.
- Compared to the Audiovector QR 7 SE paired with the Leben, the Unico 90 made the Audiovector sound like better speakers.
- Compared to other integrated amplifiers on the reviewer's Favorite List around the Unico's price, it is considered a very worthy contender along with the Audio Research I/50, Cambridge Audio Edge A, or Enleum AMP-23R in terms of overall sonic goods.
Takeaway: The Unison Research Unico 90 is a great amplifier because it makes music sound and feel exciting and lively. It's also versatile, as it can work well with different speakers.
All
Unico 90
reviews
Manufacturer details
- Output power: 100+100 W RMS su 8Ω / 160+160 W RMS su 4Ω
- Frequency response: -1dB @ 12Hz e 45kHz -3 dB
- Input impedance: 21Kohm // 300pF
- Input sensitivity: 860mV RMS
- Input stage: Pure A class, double triode totem pole ECC83 and parallel totem pole ECC81
- Output stage: Class AB thermostable, complementary Hexfet (3 pairs for channel)
- Number of stages: 2
- Inputs: 6 line (3 unbalanced, 2 balanced, 1 "bypass" unbalanced)
- Line Outputs: 1 tape, 1 sub (volume controlled)
- Output connectors: 4 + 4 bi-wiring
- Global Feedback factor: 0 dB
- THD: < 0.15% @ 1kHz, 1 W < 0.5% @ 1kHz, 10 W
- Output resistance: <0.4 ohm
- Power Consumption: 550 W (at max power on 8 ohm)
- Dimensions: 43.5cm x 44 cm x 18 cm h
- Net weight: 20 kg
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- Unison Research products are hand-crafted in Italy, using locally sourced materials and distinctive design elements like wood trim and stainless steel, creating a unique visual aesthetic.
- They specialize in hybrid amplifier designs, using tubes in the preamp stage and solid-state MOSFETs in the output stage, aiming to capture the sonic benefits of both technologies.
- They custom-design and manufacture their own transformers, tailoring them to specific amplifier models for optimal performance and a unique sonic signature.
- Unison Research designs incorporate minimal stages and often utilize zero feedback, prioritizing sonic purity and a balanced sound across a wide range of music genres.
Select products
Simply Italy
- Positioning: The entry-level integrated amplifier in the Unison Research lineup.
- Description: Offers a compact design with a focus on delivering high-quality sound through its single-ended, ultralinear Class-A output stage. It stands out with its optional USB DAC board, making it versatile for digital audio sources, unlike the more traditional analog-only models like the S6.
Unico Primo
- Positioning: A mid-range integrated amplifier in the Unison Research lineup, offering a balance of performance and affordability.
- Description: Features elegant design and robust build, with a Dynamic A Class POWER MOSFET output stage. Its multiple RCA inputs, including an optional phono stage, offer greater system compatibility compared to the more basic Simply Italy.
Triode 25
- Positioning: A versatile mid-to-high range amplifier, celebrating Unison Research's 25th anniversary with advanced features.
- Description: Notable for its ability to switch between triode and pentode modes, offering flexibility in sound output. Its dual-mode operation and higher power output provide enhanced versatility.
Performance
- Positioning: A premium offering, designed for those seeking high power and classic design.
- Description: Delivers 45 watts per channel with a dual mono design, providing a powerful and immersive audio experience. It surpasses the S6 in power. Its bi-wiring capability and elegant design enhance its functionality.
Reference
- Positioning: The flagship monoblock amplifiers in the Unison Research lineup, offering the highest level of performance.
- Description: Designed for ultimate power and precision, featuring a double parallel single-ended Class-A design. With 80 watts of output power, they exceed the Performance model. Their superior build and advanced technology represent the pinnacle of the lineup.
Our take on the brand
Look inside the brand
Our interview with the brand
What are two key technological innovations or strong opinions that differ you from other brands?
We’re an Italian company that sources everything as locally as possible. Italian through and through—everything we do is done here in Italy. Italian gear really does have its own sound. Sounds more romantic, less analytical. Very listenable. Low levels of ear fatigue.
We’re still hand making tube amps and continually refining them. New innovations in grounding, such as each component being grounded independently so they're really quiet as far as tube amps go, is an ongoing focus—always evolving mature tech.
But we also have new modern tech that's a hybrid of solid state and tube—to give you the best of both worlds. You can run pretty much any speaker you want.
In short, it’s a really easy to listen to sound.
What's your approach to customer support?
What are your favorite tracks for showcasing the strength of your products?
What other products pair best with yours?
Opera speakers are a great pairing because they're under the same parent company . When Unison is voicing their amps, they use Opera speakers, and vice versa.
However we've had no issues with pairing with Unison research. (But if you're looking at tube gear, you do have to be more careful because you do need a more sensitive speaker.)
In fact, are your speakers very technical? Pairing with Unison Research can help tame that a bit.
Used
Unison Research
What if you spend more?
The ULTIMA INTEGRATED is a class-leading 125-watt integrated amplifier benefitting from the latest dual-feed-forward error-correction topology, Chord Electronics' legendary proprietary ultra-high-frequency power supplies, plus an unmistakable industrial aesthetic.
Designed by Chord Electronics' founder, owner and chief engineer, John Franks, the advanced ULTIMA circuit monitors and immediately corrects audio signals before the output stage, for astonishing signal accuracy from a one-box integrated device. The ULTIMA INTEGRATED also takes advantage of the very latest developments in advanced low-distortion power supplies – devices offering exceptionally low noise and outstanding amplifier operation – for even greater fidelity.
A four-input design, one fully balanced and three unbalanced, all enjoy individual buffering and are selectively filtered against potential ingress from radio frequency interference; selection switching is via microprocessor-controlled sealed relays.
The ULTIMA INTEGRATED is the first new Chord Electronics integrated amplifier for seven years and remains the sole full-width integrated model in the range. All metalwork is precision-machined from solid aircraft-grade aluminium, including Chord Electronics' iconic Integra Legs. The fascia sports a 28-mm-thick front panel with a perfectly symmetrical aesthetic, centered around a spherical power on/off control with polychromatic lighting, flanked by illuminated volume and balance controls.
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Product Strengths
- Astonishing agility, precision, and clarity
- Spacious and uncluttered presentation
- Sturdy build
- Combines the precision and speed of older designs, but renders the sound with a naturalness
- Provides plenty of power without compromising on detail or clarity
Product Considerations
- Most rivals are better equipped
- Can sound thin if partnered poorly
- Could deliver stronger dynamic contrasts
- The balance control has no center detent or marked position
- No digital inputs or Wi-Fi
Comparisons (according to reviewers)
- Vs Mark Levinson's No.5805 or PMC Cor, some may prefer the warmer, fuller presentation of rivals
- Vs Naim Supernait 3, it doesn't track the music's rhythms with the skill of the Naim
- Vs Rega Elex-R Mk3, the Chord Ultima Integrated delivered undeniably elevated sound in all respects
- Vs Bryston 7B 3 monoblocks, midrange, especially with vocals, was more lifelike through the Ultima Integrated—smoother and more liquid
- Clear preference for Chord Ultima, especially the dynamics
- Vs Accuphase E-270, the Chord is more natural and closer to the CH Precision system in terms of tonality and neutrality
Takeaway: The Ultima Integrated offers much of the performance of Chord's pre/powers in a neat one-box solution, presenting a refreshingly straightforward product to use. The Chord Ultima Integrated is a thrilling and soothing amplifier capable of weaving a wonderfully spellbinding sound.
Video review
Our take on the brand
Product Strengths
- Dual-mono design delivers 303W per channel into 8 ohms, providing power and control for any speaker
- High damping factor of over 4000 ensures absolute control over speaker drivers, resulting in pristine sound reproduction
- New DAC implementation based on ESS Sabre 9038Q2M chip offers pure audio fidelity without any resampling or upsampling
- Supports streaming via Apple AirPlay 2, Spotify Connect, Tidal Connect, and UPnP/DLNA
Product Considerations
- Does not have a phonostage
- Lacks an HDMI jack with ARC
- The supplied RC10 remote is slender with tiny buttons
- Weighs 22kg
- Minimalist design may be a bit bland for some
Comparisons (according to reviewers)
- Vs Bryston B135 SST 2, the H600 delivers more effortless presentation at high output
- Vs McIntosh MA9500, the H600 has bigger sound, is crisper and has higher resolution
Takeaway: The H600 is a versatile and powerful integrated amplifier that excels in delivering high-quality audio from both digital and analog sources. Its robust amplification makes it a great choice for audiophiles seeking a simplified yet high-end audio solution.
Video review
Our take on the brand
Imagine a sleek, compact design that oozes class. Imagine an amplifier design that packs enough power to comfortably handle even the most demanding of loudspeakers. Imagine a complex yet agile and easy to use fully transparent line stage. Imagine every possible Phono EQ setting available from the comfort of your listening chair. Imagine a highly acclaimed discrete DAC boasting the best specs and sound around. Imagine, combining all of the above!
Reality. Is. Kula!
Kula is an a la carte modular design creating a fusion of highly technical previous accomplishments. The chassis itself is borrowed from the acclaimed Makua preamp, as is the line stage section and its optional phono stage with independent adjustable settings and up to 6 separate inputs. The optional DAC section which also is available in the Makua, is identical to the world-class Tambaqui stand-alone unit and features 5 digital inputs including Roon endpoint and Bluetooth.
Additionally, the Kula incorporates a Mola Mola exclusive amplifier which boast an output of 150 Watts @8 Ohm, doubling into 300 Watts @4 Ohm. Clearly enough power to drive any speaker with ease.
Our summary
Product Strengths
- Exceptional audio quality from its line inputs, optional streaming DAC, and optional Phono stage
- Stunning transparency, commendable focus, and open and airy sound staging
- Inspired and seamless reproduction—with a spark of life quality
- User-configurable phono stage that competes with pricey dedicated boxes
- The DAC module, based on the Tambaqui, rivals many uber-expensive standalone units
Product Considerations
- The Kula gets quite hot during operation, needing a decent amount of ventilation
- The LEDs are very bright, and there is no way of turning them off
- The remote is borrowed from Apple TV and is not refined enough to give decent control over volume
- There is no coaxial digital input
Comparisons (according to reviewers)
- The Kula sounds a little sweeter than Mola Mola Kaluga mono amplifiers
- The Mola Mola Kula sounded like a sibling to Leben CS600
Takeaway: The Mola Mola Kula is a state-of-the-art, all-in-one amplification solution that brings music to life with transparent and life-sized sound. With optional modules, it becomes a highly versatile and elegant solution for audiophiles who want top performance in a single box.
Video review
Our take on the brand
The MOON 641 is the centrepiece of any audio system, housing a preamplifier and a power amplifier in a single unit. This thrilling entry point to the North Collection is a truly stunning integrated amplifier showcasing premium MOON design and the latest audio technologies.
Product Strengths
- Stunningly handsome design and aesthetics, with a curvaceous chassis and easy-to-read display
- Offers a rare sense of liberation and fluidity, allowing music to flow freely and cleanly
- Delivers a wealth of transient definition, deep and solid bass, heaps of dynamic contrast, and plenty of timbral information
- Capable of driving difficult speaker loads without issue
- Excellent build quality and finish
Product Considerations
- Lacks digital inputs, phono stage, and headphone output
- Only has a single balanced input
- May be considered minimalist in specification by some, especially considering the price
Comparisons (according to reviewers)
- It performs better than Moon 600i v2 and 700i v2 amplifiers, apart from ultimate power compared to 700i v2
Takeaway: The Moon 641 is a well-designed, high-performing integrated amplifier that prioritizes sound quality and ease of use. It is a good choice for those who appreciate a refined and engaging listening experience with a focus on analog sources.
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Wide and deep soundstage, with a depth extending as far as 70 feet in one test
- Music reproduction is natural and realistic, creating a sense of instruments and voices being present in the room
- High frequencies and cymbals shimmer and crash realistically
- Impeccably constructed and manufactured with original circuit solutions
- Capable of drama, delicacy, and danger which transcends reproduction — turning the act of listening into a full-fledged experience
Product Considerations
- Selector knob on top of the unit is difficult to access when the tube cage is installed
- Speakers need to be a good match for the amplifier's 23 watts of power
- Bass was shy and ill-defined when used with the Dynaudio Contour 60i speakers
Comparisons (according to reviewers)
- Compared to Conrad Johnson Premier 10 & 11A, the Simply 845 has a wider and deeper soundstage and better reproduction of high frequencies and cymbals
- Compared to PrimaLuna (top-of-the-line), the Simply 845 sounds better sonically
- Compared to Line Magnetic Audio LM-845iA Integrated Amp, the Simply 845 does delicate better
Takeaway: The Simply 845 is a revealing integrated amplifier that makes music sound magical and is an excellent choice, especially for horn speaker lovers. This amplifier transforms speakers into something wonderful and will enhance the music experience.
Video review
Our take on the brand
Our Summary
Product Strengths
- Refinement and smoothness in sound
- Exceptional build and finish, including exquisite woodwork
- Seductive midrange and overall musicality
- The Sinfonia has a romantic, addictive sound that's better suited to classical music
Product Considerations
- Not the last word in slam
- Needs careful system partnering to sound its best
- Dynamics were very good, although not exactly of the same caliber as with the ModWright preamp and amp
- When pushed to the extremes, during the most dynamic passages, the Sinfonia began to reach its limit—compressing gently and giving up some of the low frequency control
Comparisons (according to reviewers)
- Sinfonia offers a smoother, warmer, and more seductive sound, while the S6 amplifier sounds a little 'faster' and more linear
Takeaway: The Sinfonia is a fine amplifier with a beautiful build that delivers a refined and smooth sound. It's a good choice for enjoying music and will make your eyes smile with its hand-made Italian design.
Video review
Our take on the brand
Our Summary
Product Strengths
- Delivers a warm, musical, and enveloping sound
- The tube system gives the sound a warm and smooth signature, with excellent mid and high frequencies
- The amplifier reproduces a richly detailed and well-balanced soundstage
- Even at high volumes, the amplifier shows no signs of compression or fatigue
Product Considerations
- The bass, while well controlled and articulate, is not as deep and impactful as in some solid-state amplifiers
- The S6 Black Edition requires manual adjustment of the rest current of the tubes (bias) using circular instruments and switches/trimmers
Takeaway: The Unison Research S6 Black Edition offers audiophiles top-notch sound performance and an exclusive modern design, making it ideal for those seeking excellence in both aesthetics and functionality. Its warm and engaging sound makes listening to music a treat.
Video review
Our take on the brand
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Our Summary
Product Strengths
- Addictive sound signature, unlike any other amp, with otherworldly instrument and voice reproduction
- Delivers serious magic with Fleetwood Deville and Klipsch Heritage speakers, revealing obscure details and creating a massive soundstage
- Dynamics for days
- Combines the qualities of a nice SET amp without the downsides, like noise or tube replacement
- Exceptional build quality and design with high-quality parts
- Only has two RCA inputs, no XLR balanced connections
Product Considerations
- Heavy speaker cables can cause the amp to tilt
- The volume dial functions as a gain dial, which may be different than what some users are accustomed to
- May not be suitable for hard-to-drive speakers in the 85db range that dip into 2–4 ohms
Comparisons (according to reviewers)
- The AMP23R offers more texture, layering, mid-bass, and vocal presence than Nagra INT
- The AMP23R is more organic, ethereal, and dynamic than Kinki Studio EXM1
- It sounds better than the Vinnie Rossi L2iSE, so long as the speakers are easy to drive
- The Enleum has more delicacy and finesse than Pass Labs and Cary Audio
- The AMP23R stacks up with the finest gear such as ampsandsound Bryce monoblocks
- Pass Labs First Watt SIT-3 offers a bit more organic, warmer presentation
Takeaway: The Enleum AMP-23R is a small but mighty integrated amplifier with a unique and addictive sound signature, and it is built with high-quality components. It's a great choice for those with sensitive speakers looking for a reference-quality system in a compact package.
Video review
Our take on the brand
Our Summary
Product Strengths
- Exceptional build quality with a blend of expertly crafted wood and metal, creating a visually striking and durable statement piece
- Dynamic, rich, and effortless sound with excellent detail, texture, and the right amount of tube magic
- Powerful output capable of driving demanding headphones while maintaining clarity and control
- Versatile performance with a variety of headphones (dynamic and planar) due to its output transformer design, often improving sound for warm or neutral headphones
- Value added by its ability to be used as a pre-amplifier in a stereo system
Product Considerations
- Large size and weight (around 15kg) require ample desk space and sturdy furniture
- Generates heat, which could be a concern in warmer environments without adequate ventilation
- Accidental switching of 'On/Off' is possible due to the touch-sensitive bar in the front not being intuitive, so use with care around pets
- Too powerful for some very sensitive IEMs, potentially resulting in overwhelming sound or audible hiss, though this is not the intended design for the amplifier
Comparisons (according to reviewers)
- Vs HIFIMAN Susvara, Envy empowers Susvara's natural presentation while giving it all the dynamics and slam needed
- Vs Cayin HA-300MkII, Envy exhibits more linear mid-to-high frequencies and offers a more transparent sound, while HA-300MkII has a warmer—more engaging midrange
- Vs AURIS Headonia 2A3, Envy performs at the same level, with technically incredibly strong aspects
- Vs Octave V 16, Envy completely demolishes the V 16 when it comes to energy, control, timbre, and resolution
- Vs Ferrum OOR, Envy is more powerful sounding, while also being more detailed with better tonality
Takeaway:
The Felix Audio Envy is a high-end headphone amplifier for audio enthusiasts who want the best quality sound to bring out the magic in their favorite headphones. Its stunning design and versatile performance make it a worthwhile addition to any serious audiophile setup.
Video review
Our take on the brand
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