DIA-400S

Class: D

Brand details gato-audio.com

Specifications

Output power: 2x 400 W / 8 Ω - 2x 800 W / 4 Ω
Frequency response: 20 Hz-20 kHz - 0.5 dB, and 2 Hz-70 kHz - 3 dB
Total Harmonic Distortion: < 0,01% at rated power
Signal to noise ratio: > 110 dB
Line out maximum level: 13V balanced, 6,5V unbalanced
Input impedance: 20 kΩ RCA or 40 kΩ Balanced
Line output impedance: 75 Ω
Voltage gain: 26 dB (+10 db headroom)
Recommended speaker load: 4 -16 Ω
Power Requirements: 115 VAC/230 VAC, 50 Hz/60 Hz, 1600W max
Power consumption stdb/idle/max: < 1W/35W/1600W
Dimensions (WxHxD): 325 x 105 x 420 mm / 12.8 x 4.1 x 16.5"
Weight: 13 kg / 28.7 lb

Description

The Gato Audio DIA-400S is all about merging the best sound quality with the best and most versatile features. The all new Gato Audio DIA-400S has been thoroughly updated compared to the standard DIA-400. We wanted to get the performance even closer to that of our AMP-150 integrated amplifier but keeping all the versatile features and even adding a high quality aptX Bluetooth receiver.

The reference in Class-D amplification just got even better! The Gato Audio DIA-400S is all about merging the best sound quality with the best and most versatile features.

S is for "Super"

The all new Gato Audio DIA-400S has been thoroughly updated compared to the standard DIA-400. We wanted to get the performance even closer to that of our AMP-150 integrated amplifier but keeping all the versatile features and even adding a high quality aptX Bluetooth receiver. The DIA-400S has not only become one of the best sounding Class-D amplifiers but also the most flexible available.

We changed and improved the electrical circuits and layouts in more than twenty ways, the most significant being:

Optimized mains filter

Improved general and local power supplies

New input stage

Improved output stage

New analogue stages in the D/A converter

Improved digital signal routing

Updated firmware

Improved connectors

Incorporated aptX Bluetooth module

Even though the DIA-400S is a rather expensive amplifier, it dares to be compared directly to exotic Class-D amplifiers at twice or four times the price. It features the best Class-D amplification technology available and combined with our delicate analogue circuits - the result is absolutely world class sonic performance. The DIA-400S is recognizable by its clock like ring around the solid volume knob.

Our reference in Class-D amplifica...

Release Timeline

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:

Gato Audio products exhibit a distinct design aesthetic, characterized by elegant curves, brushed aluminum, and the option for high-gloss black, white, or walnut top covers.
The brand incorporates high-quality DACs, often Burr-Brown PCM1794A chips, with upsampling of digital signals to 24-bit/192kHz for enhanced sound reproduction.
They integrate a custom-designed network player module (NPM) that offers extensive streaming capabilities and Roon endpoint functionality, transforming their amplifiers into versatile all-in-one solutions.
Gato amplifiers aim to emulate the sonic characteristics of Class AB amplifiers while utilizing the efficient, cool-running Class D topology, often employing International Rectifier circuits in their designs.

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DIA-250S NPM

Positioning: Positioned as a versatile and cost-effective integrated amplifier in Gato Audio's lineup.
Description: Offers a powerful 250W per channel output with a built-in Roon Ready network player. Its Class-D amplification and advanced D/A converter provide smooth and detailed audio, distinguishing it from the more powerful DIA-400S NPM. This model is suitable for small to medium-sized rooms and offers excellent value for those with a moderate budget, while still providing extensive connectivity options for various digital sources.

AMP-150

Positioning: Gato Audio's reference integrated amplifier, known for its high aesthetic and technical quality.
Description: Features Gato Audio's TwinFET technology, which ensures minimal distortion and a pure sound. With 150W per channel, it offers less power than the DIA-400S NPM but focuses on delivering a more traditional analog sound experience.

DIA-400S NPM

Positioning: The flagship model in Gato Audio's integrated amplifier series, offering the highest power and advanced features.
Description: Combines a robust 400W per channel Class-D amplifier with a Roon Ready network player, providing exceptional performance for demanding audio setups. Its advanced digital and analog connectivity, along with high-definition Bluetooth, sets it apart from the DIA-250S NPM.

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Avg. Product Price

$2,501-$5,000

Used For Sale

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Brand Popularity

289

of 900+

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Products Listed

Founding Year

2007

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AMP-150 Anniversary Edition

4444

CDD-1 Open-Box / Black

What if you spend more?

Musical Fidelity

Nu-Vista 800.2

8999

Reviews

The Nu-Vista 800 was an amplifier that has enjoyed much popularity and use as a high end hybrid integrated over the past few years. Unfortunately, as with all things encompassing modern, as well as more traditional technology, parts were discontinued. The original “retro look” display was suddenly no longer produced at very short notice. We were therefore left with a choice - discontinue a popular amplifier or workaround and replace the original with updated version but as unchanged as possible from the original formula. The Nu-Vista 800.2 measures like a dream but, more importantly, it sounds incredible. It is silky smooth with enormous transients and an effortless feel that is at once relaxing and involving. Of special note how the Nu-Vista 800.2 projects images between the loudspeakers so that you can almost touch them.

Musical Fidelity is known for its unique amplifier designs, particularly the A1 integrated amplifier that uses its top plate as a heatsink and features a distinctive current-mode phono stage. The brand stands out for its innovative dual-monoblock approach in integrated amplifiers, where separate power transformers and dedicated power supplies are housed in a single chassis, as seen in their M8xi and M6i models that deliver exceptional power output.

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Our summary

Product Strengths

Exceptional build quality and power output meters
Hugely revealing performer with warm, rich, and smooth sound
More power than most will ever need
Dual-mono design with nuvistor tubes for the input stage and solid-state output stage
New power transformers are rewound to have lower standing flux, making them less sensitive to mains DC offset noise

Product Considerations

The remote control is difficult to read in poor lighting conditions
The VU meters are distracting to some
A very heavy and sizeable unit
It does not have a phono stage or digital inputs
Transient response was below that of the best integrated amplifiers, as was its resolution

Comparisons (according to reviewers)

Vs. Hegel H590: The Hegel H590 offers similar level of performance

Takeaway: The Musical Fidelity Nu-Vista 800.2 is a powerful and well-built amplifier that delivers a smooth, musical, and detailed sound. Its exceptional power and unique nuvistor tube design make it a great choice for audiophiles who want a high-performing and visually impressive centerpiece for their system.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Rotel

X5 Series 2

8499

Reviews

The Michi X5 Series 2 Integrated Amplifier combines 600 Watts of unwavering Class AB output power and an ESS SABRE 8-Channel Digital to Analog converter to deliver breathtaking precision and unparalleled control. Analog, Digital, XLR, aptX™ HD Bluetooth, PC-USB, Moving Magnet and Moving Coil Phono Stage sources are all supported.

Rotel is a family-owned hifi brand that maintains control over its entire manufacturing process, including producing their own custom toroidal transformers for superior audio performance. Through their Balanced Design Concept and Michi high-end line, Rotel focuses on long-term product development cycles rather than frequent launches, emphasizing genuine performance improvements through careful component selection and circuit design.

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Our summary

Class: AB

Product Strengths

Exceptional build quality commensurate with the Michi name
An almost absurd amount of power to drive even the most demanding loudspeakers (350Wpc into 8 ohms, 600Wpc into 4 ohms)
A very quiet and nice-sounding onboard phono stage
Excellent sound quality with both analog and digital sources
The ESS Sabre ES9028PRO DAC delivers a precise, tighter, and more open soundstage
Streaming is limited to Bluetooth ACC and aptX HD

Product Considerations

Lacks built-in Wi-Fi for streaming
No settings for adjusting capacitance or resistance on the phono input, values are preset
The power amplifier section cannot be muted when using preamp outputs
Some reviewers would like to see an HDMI ARC connection

Comparisons (according to reviewers)

Vs Bryston B135 SST 2, the X5 S2 has greater power, broader connectivity, and more luxurious industrial design
Vs Hegel H400, X5 S2 has more power in the sub-bass range and a phono input, but the H400 has streaming via Ethernet
Vs Yamaha A-S3200, X5 S2 has better control, especially in the bass
Vs McIntosh MA5300, X5 S2 has more power
Vs Hegel H600, the Michi X5 S2 delivers comparable high-end performance

Takeaway: The Michi X5 S2 is a powerful, all-in-one integrated amplifier that delivers excellent sound quality and build quality, making it a great choice for those wanting a high-end audio solution. Its massive power reserves ensure it can drive almost any loudspeaker with ease.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Enleum

AMP-23R

6250

Reviews

Enleum was launched as a new brand with the AMP-23R. While our legacy AMP-13R had already been praised all around the world for its performance and unique design, we pushed the boundaries to create the AMP-23R with a new circuit that truly enhances the existing performance. We have drastically improved the PCB circuit board design, chosen new internal components and upgraded our JET2 Bias design. And the reviews and awards are unanimous. The AMP-23R's physical size and footprint may be compact, but with the all new chassis and thermal heatsink design, we've launched a product that's fit for the next generation reference compact amplifier. The unique design is the DNA of our new Enleum Brand and was already awarded the Red Dot Award: Product Design 2021 and iF Design Gold Award 2022. The AMP-23R proudly showcases Enleum's expertise in technology and design.

Enleum is a hifi brand known for its compact yet powerful amplifiers, particularly the AMP-23R, which delivers performance comparable to much larger systems through its unique gain control system and zero negative feedback circuits.

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Our summary

Watts Into 4ohms: 31W-50W

Watts Into 8ohms: 5W-30W

Headphone Output

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

Julian Shapiro

ExtremeHiFi Writer

Feliks Audio

Envy

7345

Reviews

Feliks Audio is a Polish brand that handcrafts tube amplifiers, including their flagship Envy model which features single-crystal copper wiring and 300B tubes known for their linearity and low distortion. Their amplifiers stand out for their ability to drive both high-impedance dynamic and planar magnetic headphones, which is uncommon among tube amplifiers, while maintaining a low noise floor and delivering natural, warm sound.

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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

Julian Shapiro

ExtremeHiFi Writer

What competes at this price?

Gato

DIA-400S NPM

4717

Released

2021

The reference in Class-D amplification with our all new Roon Ready streaming module built-in is an absolute killer among the one box solutions in the market today.

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Our Summary

Class: D

Product Strengths

Warm, smooth, muscular, and dynamic sound with effortless massive power
Artful and gorgeous design, potentially museum-worthy, with a sleek aluminum front, large display, and silky volume knob
Dead silent in operation and runs cooler than most class A or A/B amps
The built-in DAC is very good, making it a great one-box solution for digital music

Product Considerations

The sound can be a bit crystal clear and lean out of the box, requiring burn-in time to reach its full potential
The top end may not be as airy or holographic as some Class A or AB amps
It will not sweeten up or add flavor to the sound, so bad recordings will still sound bad
The Bluetooth sound is flatter and thinner compared to using a proper streamer into the Gato DAC

Comparisons (according to reviewers)

Vs Aavik U-150: The Aavik is warmer, richer, and has more detail and air, but the Gato gets close at a much lower price
Vs Michi X3: The Gato has more body, warmth, and smoothness, with a greater sense of power and ease

Takeaway: The Gato DIA-400S is a powerful and beautiful integrated amp that delivers a warm and smooth sound, making it a great all-in-one solution for those who value both performance and design. It offers effortless power and a musical presentation that can connect you with your music.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Cambridge Audio

EVO 150

2999

Released

2021

With Evo 150, we've brought your audio past and present into the future. With outstanding Hypex NCore Class D amplification and our class-leading StreamMagic streaming platform on board, all you need to do is add speakers to enjoy superb high-resolution audio quality from one elegant, discreet box. And thanks to its suite of digital and analogue inputs, as well as its high-quality digital-to-analogue converter, Evo can be the heart of your hi-fi system for years to come.

Cambridge Audio pioneered the use of toroidal transformers in power amplifiers, a technology now widely adopted by high-end audio companies. The brand stands out for using premium amplification technology across their product range, from Class A/B amplifiers in their wireless earbuds to Hypex Ncore modules in their EVO series, while maintaining accessible price points between their CX and Edge product lines.

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Our Summary

Watts Into 8ohms: 101W-200W

Class: D

Product Strengths

Packs many features into a small frame, offering an 'all-in-one' solution by integrating streaming, DAC, preamp, and amplification
The sound quality is clear, detailed, smooth, refined, articulate, and neutral, with good soundstage and imaging
Offers a wide array of input options (analog and digital) and streaming service compatibility, making it versatile
Its Class D amplification (Hypex NCore) is powerful (150Wpc) and efficient, running cool compared to traditional amps
The industrial design and aesthetics are highlighted positively, with its sleek look, swappable side panels, and user-friendly interface, enhancing its lifestyle appeal

Product Considerations

The headphone preamp may not satisfy serious headphone enthusiasts without a dedicated amp
There is a noted lack of bass management
The StreamMagic app lags behind the likes of Bluesound and Yamaha MusicCast in terms of its interface
Some reviewers found a slight softening of the bottom end
One review notes some power supply noise in bench tests, but at inaudible levels

Comparisons (according to reviewers)

Offers wider soundstage, depth, and polish than the Naim Uniti Atom, but the Naim Uniti Atom has a greater sense of musicality and tighter rhythmic fabric

Takeaway: The Cambridge Audio Evo 150 is a versatile and attractive all-in-one system with excellent sound quality and a comprehensive feature set, making it a great choice for those seeking a simple yet high-performing audio solution. It provides a streamlined experience without sacrificing sound fidelity.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Uniti Atom Headphone Edition

Naim

3799

Released

2021

There is no easier way for you to get up close and personal with music than with the Uniti Atom Headphone Edition; put on your headphones, take yourself away, with no distractions. For even more flexibility, you can keep up to three headphones plugged in and switch sets depending on your listening preference.

Naim Audio is renowned for its distinctive "Naim sound," which focuses on timing accuracy and a unique harmonic distortion profile that creates a musical flow. The brand's meticulous approach involves extensive R&D and proprietary components like custom transistors and power supplies, as seen in their Uniti range which combines streaming capabilities with their signature sound characteristics.

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Our Summary

Headphone-Only Amplifier

Product Strengths

Offers a comprehensive and flexible specification, functioning as a headphone amplifier and streaming preamp
Produces superb sound quality, described as clear, pure, detailed, dynamic, and musical, without being overly analytical, regardless of genre or recording quality
Features a well-made, elegant, and attractive design with a beautiful screen for album art and a satisfying volume control
Supports a comprehensive range of streaming services and digital formats including AirPlay 2, Chromecast, Spotify Connect, Tidal Connect, Qobuz, Bluetooth, UPnP, and Internet Radio, and is Roon Ready
Intuitive and stable app, especially for those who know what they want to listen to

Product Considerations

The price is high relative to other headphone amplifiers/DACs on the market
The front display is not a touchscreen
Some might prefer a more analytical sound presentation
The HDMI ARC connection is absent
The Naim app lacks polish compared to dedicated music apps

Comparisons (according to reviewers)

Vs Cambridge Audio Evo 150 and NAD M10—the Uniti Atom Headphone Edition is specifically focused on headphone use
As a headphone amp, it is every bit as good as the Chord Hugo TT2
Naim puts less of itself into the performance as opposed to McIntosh MHA200

Takeaway: The Uniti Atom Headphone Edition is a great self-contained system for headphone listening, with an easy-to-use interface and a beautiful design. It is a quality product that can be a centerpiece for your home audio.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Audiolab

9000A

2999

Released

2022

As ever, the 9000A is the centre of the audiolab focus in being the beating heart of any high-performance audio system. It's more powerful, capable and feature-packed than any of the preceding models – the most advanced audiolab integrated amplifier yet.

Audiolab is a hifi brand known for its unique streaming platform from Pixel Magic, which enables over-the-air updates and wide audio format compatibility including DSD. Their amplifiers and components feature distinctive capabilities like HDMI ARC inputs, user-selectable digital filters for sound customization, and advanced filtering technology in their pre/power amps.

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Our Summary

Watts Into 8ohms: 51W-100W

Watts Into 4ohms: 101W-200W

Class: AB

Product Strengths

Sonic clarity, detail resolution, and control
Sturdy build and fine finish with solid casework and nicely damped
Flexible product offering integrated, pre-amp, or pre-power combo options
Balanced nature means that no particular genre of music is favored above any other
Impressively equipped with a wide range of inputs including RCA, XLR, Coax, Optical, USB B, and Bluetooth 5.0 with aptX HD and LDAC

Product Considerations

Dynamic contrasts could be stronger
Rhythmic drive could be stronger
Phono stage a little flat-footed
The display graphics on the screen can be on the small side to read from across a room
Treble could be more exciting and dynamic

Comparisons (according to reviewers)

Vs Audiolab 6000A: Offers better instrumental separation, clarity of guitar strings, and a fuller bass response
Vs Naim Nait XS3 or Rega Elicit Mk5: Delivers less entertainment and rhythmic drive

Takeaway: The Audiolab 9000A is a capable and flexible amplifier offering sonic clarity and a range of features to slot easily into most systems. It charms and delights, never forcing music onto your ears but always upgrading the sound for great speaker performance.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer

Rega

Elicit MK5

3345

Released

2022

The all new Elicit MK5 stereo integrated amplifier is designed and built to the highest standard. Housed in our latest custom case to match the rest of the Rega range, the new MK5 builds on previous Rega designs by using our multi-award-winning Class A/B power amplifier circuit to deliver a powerful 105 W per channel into 8 Ω loads (127 W into 6 Ω). Our engineers have designed a new Rega DAC circuit offering digital connectivity and greater integration with a variety of other products. We have taken great care to incorporate a high-quality MM phono stage and the headphone output has been configured such that the speaker switching is performed by the output mute relay to avoid obstructing the signal path.

Rega is a British hifi brand known for its minimalist, low-mass turntable designs that challenge the industry's typical heavy-mass approach to reducing vibration. Their hand-assembled turntables and tonearms use advanced materials like graphene-infused carbon fiber and feature slim yet rigid plinths with striking glass platters, reflecting founder Roy Gandy's unique engineering perspective on how components affect

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Our Summary

Watts Into 8ohms: 101W-200W

Watts Into 4ohms: 101W-200W

Class: AB

Product Strengths

Ground-breakingly different than its predecessor (Elicit-R) and the Elex R, integrating the Athos sound and signature
Combines musicality with a real sense of propulsion
Taut, punchy, clear sound with impressive clarity and detail
Excellent built-in moving magnet phono stage, delivering enjoyable results across various music genres
Internal DAC is of good quality, sitting comfortably beside the analogue line stages in quality, with lively and punchy character, strong detail levels, and dynamic contrasts
Lacks USB input or Bluetooth connectivity

Product Considerations

May run hotter than usual
Can sound a little bright tonally, requiring careful speaker choice
Volume control steps on the remote may be too large for precise adjustments
Functional looking rather than stylish

Comparisons (according to reviewers)

Vs. Roksan K2: The Elicit MK5 is a brawny amplifier with a full package for the audiophile journey
Vs. Exposure 3510: The Elicit has a decent headphone option and the MM input, while the Exposure would suit if one already has a decent phono stage and a DAC in place
Vs. Cambridge Audio Edge NQ / 2 x PA-10: While the Edge / PA-10 setup justifies its higher sticker, the Rega Elicit MK5 has a ballsier take on music

Takeaway: The Rega Elicit MK5 is a well-built amplifier that delivers a detailed, clear, and punchy sound, making music sound great and alive. With its integrated DAC and phono stage, it is ready to be the heart of any great listening setup.

Video review

Our take on the brand

Julian Shapiro

ExtremeHiFi Writer