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IN400 Evolution

Name: IN400 Evolution
Brand: Atoll
SKU: ATOLL-IN400-EVOLUTION

Series Line 400

The integrated amp-preamp IN400 Evolution was conceived for optimal reproduction. The chassis is made of 2 mm steel, and the front panel is made of 10 mm aluminium.

At a glance

All specifications

Dimensions (W × H × D): 440 × 370 × 130 mm
Weight: 19.5 kg
Total of capacitors: 96 680 µF
Bandwidth (-3 dB): 5 Hz – 100 kHz
Rise time: 2 µs
Input impedance: 357 kΩ

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Features1
Downloads1
Awards and press5

Overview

The IN400 EVO is an integrated amplifier-preamplifier capable of conveying the essence and emotion of the musical message. Its design is based on technical and aesthetic choices derived from extensive research and listening sessions. The audio stages and components have been meticulously calibrated and selected for their performance. The mechanical elements are engineered to absorb vibrations and ensure optimal heat dissipation.

Highlights

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 toroidal 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).

Features

USER INTERFACES
Front panel buttons: – Power ON/OFF. – Source selection. – Volume control. – Balance control. – Button backlighting. – Display control. – Low-power mode selection. Low-power OLED display. Standard remote control allows control of all products: Integrated, Preamps, CD players, Tuners, and DACs.

Specifications

Inputs: 2 XLR inputs. 5 Line inputs: AUX or PHONO (optional), CD, TUNER, DVD, TAPE. 1 BY-PASS input.; The sources you can connect.
Dimensions (W × H × D): 440 × 370 × 130 mm; Width, height and depth, without cables.
Weight: 19.5 kg; Per unit, out of the box.
Model code: ATOLL-IN400-EVOLUTION; Quote it when you ask a specialist.

Connectivity

Inputs: 2 XLR inputs. 5 Line inputs: AUX or PHONO (optional), CD, TUNER, DVD, TAPE. 1 BY-PASS input.
Outputs: 1 Ø 6.35 mm headphone jack output. 1 12V Trigger output.
Various: Possibility of adding DA100 or DA200 digital boards (optional).

Technical data

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

Optional boards

1 Digital board (of your choice): DA200 2 Coaxial inputs (24 bits/192 kHz) 2 Optical inputs (24 bits/192 kHz). 1 Bluetooth receiver.
1 USB-B input: PCM & DSD. DA100 2 Coaxial inputs (24 bits/192 kHz). ———————————
1 Phono board on the AUX input (optional): P100 (configurable MM or MC). P50 (MM).

Downloads

IN400 Evolution Owner’s manualManual · English · PDF, 713 KB
Download

Awards and press

Haute Fidélité Meilleur Achat
The Ear Editor’s Choice
The Ear Best of 2025
Vumètre Remarquable
It’s a machine capable of driving a very wide variety of loudspeakers with a fluid and engaging musicality, which will keep us on our toes for hours. Furthermore, we are in the presence of an amp manufactured to perfection with an attention to detail that is not always found at this level in this price range. Of course, it’s a sum and not an insignificant one, but despite everything, we can declare without blushing that the quality-price ratio is excellent. A notion that is no longer discussed at this price point. If an exception were needed, here it is.
Laurent Thorin, Vumètre no. 56