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
- More weight, body, and tonal richness create a fuller sound
- Capable of reproducing music up to a high quality level
- Easy to use, with simple digital inputs and single ended/balanced outputs
- Improves realism in music reproduction
Product Considerations
- Lacks analog inputs, making it less suitable for turntable users
- When changing the volume with the remote, all the DAC LEDs illuminate
Comparisons (according to reviewers)
- The Adagio is a much smoother sounding DAC overall, compared to Metrum Acoustics Onyx
- The Adagio with the new Transient modules, a more powerful supply and higher working voltage is clearly better than the Metrum Acoustics Pavane
Takeaway: The Adagio provides impressive sound quality, fleshing out music with more weight and tonal richness, making it more engaging. It is a very interesting DAC and pre-amplifier that could be brilliant for many audiophiles.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
All
Metrum Adagio
reviews
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An excellent review of a great product
/
Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022
Video Review
Manufacturer details
Features
Specifications
- Digital To Analog Converter Type: Non Oversampling
- Audio Bit Depth: 24 bits per sample
- Correction Type: Forward (FPGA) corrected
- Transient chips per channel: 4
- Noise Floor: -155 dB
- Output Impedance RCA: 100 Ohm
- Output Impedance XLR: 320 Ohm
- Total Harmonic Distortion: 0.006% THD
- Sampling rate Optical: 44.1 - 96 kHz
- Sampling rate Coax and AES/EBU: 44.1 - 192 kHz
- Sampling rate USB: 44.1 - 384 kHz
- Dimensions: 44 x 32 x 85 cm
- Weight: 10KG
Description
The Metrum Acoustics flagship DAC with volume control. Connect this digital pre-amplifier directly to your power amplifiers or active speakers. Volume control done right by steering the DC voltage of the R2R ladders.
Release Timeline
Manufacturer Site
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:
- Metrum products, including those under the Sonnet Digital Audio brand, are designed around the company's proprietary R2R ladder network DAC chips, known as Transient DAC modules, providing a unique approach to digital-to-analog conversion.
- The brand is known for its commitment to non-oversampling (NOS) designs, eschewing oversampling and filtering techniques to preserve the naturalness and musicality of audio signals.
- Metrum implements unique approaches to volume control that maintain signal integrity, utilizing techniques like changing the reference voltage of the DAC modules rather than traditional digital attenuation or analog potentiometers.
Select products
Select product comparisons
Metrum Onyx
- Positioning: A mid-range non-oversampling DAC designed for home sound systems.
- Description: Uses dual DACTWO chips per channel with parallel FPGA-driven R2R ladder networks for high linearity and clear channel separation. Compared to pricier models like the Pavane and Adagio, it offers solid performance for everyday listening at a moderate budget and suits setups where effective detail and balance are key.
Sonnet Morpheus MK-II
- Positioning: A versatile digital preamplifier DAC suited for integration with sensitive tube designs.
- Description: Adds a -10dB attenuator feature that allows output voltage adjustments, making it flexible for both DAC and preamp usage. Compared to the simpler Onyx and the more feature-rich flagship models, it targets buyers needing adaptable output control for specialized use cases.
Metrum Pavane
- Positioning: A flagship non-oversampling DAC aimed at delivering high-end, refined audio performance.
- Description: Incorporates advanced DAC 2 modules and proprietary forward correction techniques to produce a rich and natural sound with enhanced spatial cues. Compared to the mid-range Onyx and the integrated Adagio, it delivers top-tier sonic detail.
Metrum Adagio
- Positioning: A flagship DAC with integrated volume control that serves as a digital preamplifier for active systems.
- Description: Features dedicated DAC boards with larger, higher voltage transformers and separate toroidal power supplies to maintain low noise and precise volume regulation. In comparison to the Pavane and Onyx, it offers more functionality and controlled performance for users requiring integrated preamp capabilities.
Sonnet Pasithea
- Positioning: A premium DAC and preamplifier built with eight SDA-3 DAC modules for enhanced performance and versatility.
- Description: Delivers improved linearity, lower distortion, and a noise floor markedly lower than the Morpheus by using multiple DAC modules and flexible attenuation options. Compared to all other products in the lineup, it provides superior build quality and maximum sonic resolution in complex and demanding systems.
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Avg. Product Price
$2,501-$5,000
Used For Sale
11
Available (Scroll Down)
Brand Popularity
195
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
13
Founding Year
2012
Our take on the brand
Metrum Acoustics is known for its unique approach to DAC design, using R2R non-oversampling technology that wasn't common when they introduced it, with their flagship Pavane DAC using four DAC ONE modules per channel. Their DACs are particularly suited for tube lovers, with models like the Morpheus MK-II featuring a -10dB attenuator specifically designed to work with sensitive tube setups.
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Brand Page
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What if you spend more?
Denafrips
Terminator Plus 15th
7609
7609
/
1
Reviews
Denafrips is at the forefront of the modern R-2R DAC movement, producing DACs with a smooth, rich tonal quality that prioritizes organic sound reproduction over analytical detail. Denafrips products deliver ultra-low noise and distortion, competing with ultra-high-end DACs at a fraction of the cost. Often compared to Holo Audio, Denafrips shares a similar philosophy and price-to-performance ratio. They're known for using hand-picked resistors and oven-controlled crystal oscillators, which creates a more natural, analog-like sound compared to traditional DAC chips.
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Our summary
Product Strengths
- Top-notch build quality and impressive part selection.
- Noise and distortion-free performance with a black background.
- Holographic, open, and wide soundstage with impressive depth, layering, and imaging.
- Full-bodied, organic, and natural sound with a warmer tonality.
- Covers the frequency response in full, without roll-offs.
Product Considerations
- Only a DAC—lacking preamp functionalities or a remote control.
- Not the most detailed sounding unit in its stock form.
- Not the fastest sounding unit in its stock form.
- Denafrips GAIA is a must-have upgrade to squeeze the absolute best out of it.
Comparisons (according to reviewers)
- Terminator Plus terminates other R-2R dacs like Denafrips Venus, Audio-gd R7 and Musician Aquarius.
- Terminator Plus delivers a clearer, punchier, and faster overall performance than Matrix Audio Element X and Gustard X26 PRO.
- Terminator Plus was just by a hair smoother and considerably more impactful than Gold Note DS-10 Plus.
- Terminator Plus added a much-needed weight and punch in the lowest octaves compared to Denafrips Venus or Ares.
- Terminator Plus was adding a lot more meat on their bones than SMSL DO200 and Gustard X18.
Takeaway: The Denafrips Terminator Plus is an impressively built DAC that offers an emotional and engaging listening experience with its open soundstage and natural sound, making it easy to enjoy your music. It brings a level of realism and impact that can make your system sound its best.
Video review
Our take on the brand
Denafrips is at the forefront of the modern R-2R DAC movement, producing DACs with a smooth, rich tonal quality that prioritizes organic sound reproduction over analytical detail. Denafrips products deliver ultra-low noise and distortion, competing with ultra-high-end DACs at a fraction of the cost. Often compared to Holo Audio, Denafrips shares a similar philosophy and price-to-performance ratio. They're known for using hand-picked resistors and oven-controlled crystal oscillators, which creates a more natural, analog-like sound compared to traditional DAC chips.
Product Page
Product Page
SW1X
DAC III
9175
9175
/
1
Reviews
SW1X Audio Design creates DACs that use a non-oversampling approach and vintage TDA1541 chips with tube output stages, avoiding digital filtering to maintain a more natural, analog-like sound. Their products feature separate power supply chassis designs and harmonically matched vintage components, including directly heated triode tubes and AB resistors, which are carefully selected for their distinctive sonic qualities.
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Our summary
Product Strengths
- A 'stupendous piece of gear' that invites the user to listen differently from the rest.
- Exceptionally well-designed and well-built.
- The circuits are unusual.
- Features an all-tube, no oversampling, no filtering design.
- Voices were floating around the listening room—musical instruments could easily be discerned.
Product Considerations
- Not for digital purists seeking modern digital brickwall filters and megahertz FPGA oversampling technologies.
- A single input DAC with two possible interfaces.
- USB and SPDIF cables must be swapped manually.
Comparisons (according to reviewers)
- Vs PS Audio Directstream DAC—not even close.
Takeaway: The SW1X DAC III is a well-designed and built piece of gear that invites the user to listen to music differently. It offers an organic and realistic sound, making it a worthwhile option for those seeking a unique listening experience.
Video review
Our take on the brand
SW1X Audio Design creates DACs that use a non-oversampling approach and vintage TDA1541 chips with tube output stages, avoiding digital filtering to maintain a more natural, analog-like sound. Their products feature separate power supply chassis designs and harmonically matched vintage components, including directly heated triode tubes and AB resistors, which are carefully selected for their distinctive sonic qualities.
Product Page
Product Page
What competes at this price?
Laiv
Harmony DAC
2700
/
Released
2023
We're pushing the technology and design limits to bring you outstanding audio experiences. Meet our newest creation: the Precision Crafted DAC. With cutting-edge machining techniques, like CNC (Computer Numerical Control), our DAC raises the bar for audio quality, style, and toughness.
Laiv offers stunningly built hifi products at prices almost as attractive as the products themselves. Their Harmony and uDAC R2R DACs feature discrete R2R digital to analog converters with the option to run NOS (Non-Oversampling). And their HP2A amplifier is one of if not perhaps the most powerful commercially available headphone amplifier, delivering over 60 volts of output, and over 25 watts into 32 Ohms as tested by Cameron.
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Our Summary
Product Strengths
- Exemplary build quality, with a chassis milled from a single block of aluminum and high-quality components.
- Delivers a large soundstage with very good imaging and detail.
- Produces a harmonically rich presentation that R2R enthusiasts seek.
- The unboxing experience is premium, with a metal certificate of authenticity and a remote control made from solid metal.
Product Considerations
- The high output impedance (1200 ohms on XLR) might cause issues when pairing with amplifiers that have unusually low input impedance.
- Optical and coaxial inputs might not deliver the same performance as USB and I2S inputs.
- It is DAC-only unit, so it does not have preamp functionality or volume control.
- Spiked feet could scratch surfaces.
Comparisons (according to reviewers)
- Vs Denafrips Ares II: The Harmony DAC has more instrument separation and a little bit more detail through USB or I2S.
- Vs Gustard R26: The Harmony DAC is fuller in the bass and lower mid-range with a warmer presentation and wider soundstage through USB or I2S.
- Vs Denafrips Venus II: The Venus sounds bigger with more tangibility to where performers reside and more space between them.
- Vs Denafrips Pontus II: The Harmony DAC shares similarities but is slightly more resolving and realistic.
- Vs SMSL Raw Pro: The Harmony DAC is more enjoyable to listen to overall, although the Raw Pro is more detailed.
- Vs HIFIMAN EF400 and EF500: The Harmony DAC is an upgrade in detail retrieval, staging, and treble quality.
Takeaway: The Harmony DAC stands out with its build, engaging sound, and focus on providing a high-quality digital-to-analog conversion. Its ability to create a large soundstage and deliver rich detail makes it a solid option for audiophiles looking for an immersive listening experience.
Video review
Our take on the brand
Laiv offers stunningly built hifi products at prices almost as attractive as the products themselves. Their Harmony and uDAC R2R DACs feature discrete R2R digital to analog converters with the option to run NOS (Non-Oversampling). And their HP2A amplifier is one of if not perhaps the most powerful commercially available headphone amplifier, delivering over 60 volts of output, and over 25 watts into 32 Ohms as tested by Cameron.
Product Page
Product Page
Sonnet
Morpheus
3237
/
Released
2021
The Sonnet range will gives you more weight, body, tonal richness, and a more natural sense of the space of the recording. Or to put it more plainly, it fleshes out your music more! This new range does a wonderful job of presenting even the most complex music in a natural and inviting manner with every last ounce of nuance in tact.
Sonnet Audio is known for their unique R-2R ladder DAC design that splits 24-bit signals into two 12-bit streams processed by separate resistor networks, and their DACs feature volume control through reference voltage adjustment rather than digital potentiometers. Their products, including the Morpheus and Pasithea DACs, use a modular design with upgradeable components and emphasize non-oversampling techniques for natural sound reproduction.
Expand Details
Our Summary
Product Strengths
- Musical and natural sound, avoiding harshness or fatigue
- High linearity and a realistic 24-bit dynamic range
- Bit-perfect volume control by varying reference voltage directly from the DAC chips
- Roon Ready, easy to set up and use
Product Considerations
- Does not support DSD playback
- The I2S input uses an RJ45 connector, not the more common HDMI, limiting cable compatibility
- Some reviewers would like a sample rate/bit depth display on the front panel
- Direct-to-amp usage might not sound as good as using a separate preamplifier, depending on the system
Comparisons (according to reviewers)
- Morpheus offers performance equal to Metrum Acoustics Adagio/Pavane without the heavy casing
- Morpheus is better than Metrum Acoustics Onyx or Jade, with more options, expansions, and better build
- Morpheus offers greater apparent resolution and a broader dynamic range than Totaldac d1-tube DAC/Streamer
- Morpheus is better than Denafrips Pontus with soundstage, timbre, tones, and attack, and no listening fatigue on the Sonnet
- Hermes and I2S was simply much better in every way than Primare Prisma NP5 Network Player, where music sounded paler, softer, and less exciting
Takeaway: The Morpheus DAC is a great option for audiophiles seeking accurate, natural, and musically pleasing sound. Sonnet designs deliver high quality sound and could convert even the most stubborn digital skeptics.
Video review
Our take on the brand
Sonnet Audio is known for their unique R-2R ladder DAC design that splits 24-bit signals into two 12-bit streams processed by separate resistor networks, and their DACs feature volume control through reference voltage adjustment rather than digital potentiometers. Their products, including the Morpheus and Pasithea DACs, use a modular design with upgradeable components and emphasize non-oversampling techniques for natural sound reproduction.
Product Page
Product Page
Linear Tube Audio
Aero
3950
/
Released
2024
The Aero is LTA's first digital-to-analog converter, and the world's only DAC using ZOTL technology. After two years of development, dozens of versions and prototypes, and hours of listening tests, the result delivers crystalline realism, organic timbre, and encompassing soundstage.
Linear Tube Audio uses ZOTL technology, invented by David Berning, which eliminates traditional audio output transformers for clearer sound and operates tubes at lower currents to extend their life to 10,000-20,000 hours. Their amplifiers are known for extremely low noise levels and work well with both high-efficiency speakers and headphones, while featuring a distinctive clear acrylic top that shows the internal components.
Expand Details
Our Summary
Product Strengths
- Natural and engaging sound, praised for its 'non-digital digital sound' and ability to connect the listener to the music's emotive power
- Richness and fullness to the sound, achieving a balance between not being overly warm or rich nor clinical or sterile, offering a natural tonality
- Wide and deep soundstage with precise instrument placement, creating spatial dimensions comparable to higher-priced DACs
- Dynamically lively and snappy, handling complex musical passages without sounding overwhelmed
- High-quality internal parts, robust build quality, and elegant appearance
Product Considerations
- Lacks some of the detail retrieval and resolution compared to other DACs, meaning it may not deliver the same level of micro-textures
- PCM only up to 192k sampling rate, so there is no DSD support
- Some reviewers wished for I squared S and also AESEBU, the XLR input
Comparisons (according to reviewers)
- Vs Mola Mola Tembaki, the Tembaki gave more high-frequency air, clarity and better portrayed the acoustics of the recording venue, but the Aero sounded more humid, with more weight and richness
- Vs Border Patrol DAC, the Aero is more transparent and pure
- Vs Laiv Harmony DAC, the Aero slots in between with a more pleasing and engaging balance between color and resolution
Takeaway: The Linear Tube Audio Aero DAC offers a natural, engaging, and enjoyable listening experience with great soundstage. It brings musical enjoyment for those who prioritize tonality and timbrel accuracy.
Video review
Our take on the brand
Linear Tube Audio uses ZOTL technology, invented by David Berning, which eliminates traditional audio output transformers for clearer sound and operates tubes at lower currents to extend their life to 10,000-20,000 hours. Their amplifiers are known for extremely low noise levels and work well with both high-efficiency speakers and headphones, while featuring a distinctive clear acrylic top that shows the internal components.
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