Atoll Electronique IN400 Evolution
With effortless dynamics, iron-fisted bass and a vast, stable soundstage, the IN400 Evolution brings commanding scale without sacrificing natural tone or low-level nuance. Best of High End found it especially revealing and composed, while The Ear praised its transparent, detailed balance. Serious power and extensive analogue inputs make it a formidable hub for a high-end two-channel system.
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Deliciously Crispy
Sound Quality
95/100
Build Quality
93/100
Features Connectivity
85/100
Value for Money
88/100
Pros
Exceptional macro- and microdynamic expression, remaining unstrained with demanding music and high playback levels.
Deep, tightly controlled bass, precise imaging and a wide, stable soundstage.
Natural, detailed and slightly warm presentation with refined treble and convincing vocal body.
Extensive analogue connectivity, with optional DAC and phono boards for system expansion.
Cons
No built-in streamer or standard DAC; digital playback requires optional modules or external sources.
The supplied multi-purpose remote is not purpose-built for the amplifier.
Its mildly warm voicing includes subtly softened note attacks and a touch of bass bloom rather than absolute studio-monitor neutrality.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 95/100
Reviewers describe an unusually complete performance: highly resolved and transparent, but also natural, full-bodied and emotionally communicative. Its large, stable soundstage and exceptional composure with demanding music make it particularly compelling for serious two-channel systems.
Transparency Resolution
95/100
The Ear calls the overall balance "beautiful transparency" with supreme detail resolution and no audible blemish. A British Audiophile likewise found it notably cleaner than the IN300, unusually capable with microdetail, and refined and open through the highs.
Tonal Balance Musicality
93/100
The presentation is repeatedly described as natural, musically respectful and emotionally involving, with rich midrange texture and full-bodied voices. It sits slightly on the warm side of neutral, according to A British Audiophile, with mildly softened leading edges and a touch of bass bloom rather than strict studio-monitor neutrality.
Dynamics
97/100
Best of High End calls its dynamics the most convincing heard from an integrated amplifier near this price, praising both macro- and microdynamic ease. The Ear found it shrugged off demanding dynamic swings without effort, while reviewers consistently report strong bass authority, speaker control and unstrained high-level playback.
Soundstage Imaging
95/100
Reviewers consistently report a vast, deep and stable stage, with precise images that avoid sounding artificially etched. Audio2G praises extraordinary horizontal and vertical fill, while The Ear heard an enormous presentation with no hole in the middle and A British Audiophile highlights excellent separation.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
The construction receives direct praise from several reviewers: a 2 mm steel chassis, substantial 10 mm aluminium fascia and solid-machined heatsinks give it a serious physical foundation. The Ear found the controls tactile and the amplifier beautifully constructed, while Audio2G specifically commends the robust speaker terminals.
Features Connectivity
85/100
The IN400 Evolution is primarily an analogue-focused amplifier, offering four RCA line inputs, two balanced XLR inputs, a tape loop, fixed-level bypass input and pre-outs. Optional phono and digital boards can expand its remit, but there is no streamer or standard-fit DAC, so buyers seeking comprehensive digital connectivity will need to budget for modules or external sources.
Value for Money
88/100
At £5,500 in the UK, it is a substantial investment, but Audio2G considers it attainable for enthusiasts who want high-end sound without excessive financial outlay. The Ear places its sonics among the highest echelon for the price, particularly for listeners with several analogue sources and demanding loudspeakers.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
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Specifications
- Power
- 2×160 Wrms / 8Ω – 2×300 Wrms / 4Ω
- Total of capacitors
- 96 680 µF
- Bandwidth (-3 dB)
- 5 Hz – 100 kHz
- Rise time
- 2 µs
- Input impedance
- 357 kΩ
- Sensitivity
- 450 mV
- Signal-to-noise ratio
- 100 dB
- Distortion rate at 1 kHz
- 0,05 %
- Standby consumption (low consumption)
- < 0,5 W
- Dimensions
- 440×370×130 mm
- Weight
- 19,5 Kg
Manufacturer's Description — Atoll Electronique
The IN400 EVO is an integrated amp-preamp with high musical capacity. The concept is based on technical and aesthetic choices dedicated to optimal musicality. Mechanically, the chassis is made of 2 mm steel, and the front face is 10 mm aluminium, brushed, micro-blasted, and anodized, with high-precision engraving. The side heatsinks are machined from solid aluminium blocks to absorb mechanical vibrations and ensure perfect heat dissipation.
- Front face in 10 mm brushed, micro-blasted and anodised aluminium, with high-precision engraving.
- Heatsink and buttons in billet aluminium.
- 2 mm steel frame.
- One toroïdal transformer: 1050 VA for audio section
- One transformer: 1.6 VA for control logic.
- Integral double mono structure:
– Separate windings for the tracks.
– 1 attenuator per channel (with switched resistors). - Bipolar transistor input stages.
- Current sources with bipolar transistors and LEDs to ensure perfect voltage stability.
- Darlington transistor driver stages.
- Audio stages with perfectly symmetrical structure and very low counter-reaction.
- Power stages with MOS FET transistors (8 per channel) are rigorously matched.
- Precise adjustment of the balance and the possibility of memorising it.
- Possibility of choosing the standby mode: Low consumption or preheating.
- Configurable button backlighting.
- High contrast OLED display: ON or OFF mode (after 5 seconds of inaction).
- ATOLL global remote control delivered as standard.
- The IN400 Evolution can receive the following optional boards:
– DAC boards: DA100 and DA200.
– PHONO boards: P50 and P100 (can be combined with DAC boards).
CONNECTIVITY
Inputs
2 XLR inputs.
5 Line inputs: AUX or PHONO (optional), CD, TUNER, DVD, TAPE.
1 BY-PASS input.
Outputs1 Ø 6.35 mm headphone jack output.
1 12V Trigger output.
Various
Possibility of adding DA100 or DA200 digital boards (optional).
Verified Dealers
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Authorized dealers for Atoll Electronique IN400 Evolution
- A Tube High Fidelity — online and in-store — Almere, Flevoland, Netherlands (website)
- Absolute Audio - Canada — in-store — Calgary, Alberta, Canada (website)
- Akustik Strauss — in-store — Garmisch-Partenkirchen, Bayern, Germany (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- AM Audio Design — in-store — Beauvais, Hauts-de-France, France (website)
- Ambiance Concert — in-store — Angers, Pays de la Loire, France (website)
- Ars Antiqua Audio — online and in-store — Boadilla del Monte, Comunidad de Madrid, Spain (website)
- Art Sonique — France (website)
- Audio Alternative — online and in-store — Fort Collins, Colorado, United States (website)
- Audio Ark — online and in-store — Edmonton, Alberta, United States (website)
and 85 more verified dealers