Atoll Electronique IN300 Evolution silver

Stereo Integrated Amplifier: Atoll IN300 Evolution

The Atoll IN300 Evolution is a stereo integrated amplifier that reflects the expertise of the French brand, renowned for the quality of its design, its well-balanced power, and its versatility. As the successor to the IN300 Signature, this model offers notable improvements, particularly in terms of power supply, features, and modularity, while maintaining the technical standards that have built the reputation of Atoll amplifiers.

Dual mono architecture

At the heart of the IN300 Evolution lies a true dual mono amplifier architecture. Two large 440 VA toroidal transformers separately power the left and right audio stages, while a dedicated 10 VA digital transformer handles the digital circuits. This design ensures optimal channel separation and a robust power supply, guaranteeing a wide soundstage and stunning dynamics.

High‑quality components for musical transparency

Atoll Electronique has selected carefully matched components for the IN300 Evolution. The 12 high‑quality filtering capacitors, each with a capacity of 6800 μF, feature low equivalent series resistance (ESR). The MKP coupling capacitors are also high‑quality and shielded. These choices ensure great transparency of the audio signal and faithful reproduction of the finest details.

Powerful amplification and absolute speaker control

With an output of 2x150 Wrms into 8 ohms, the IN300 Evolution can effortlessly drive a wide variety of speakers. Its triple push‑pull output stage with MOS‑FET transistors biased in class A/B delivers generous current while maintaining low distortion. Thanks to this firm control, the speakers are driven with precision, reproducing all the dynamics and nuances of the music.

Comprehensive connectivity for easy integration

The IN300 Evolution offers extensive connectivity to integrate seamlessly into any hi‑fi system. It features 5 line inputs, one of which can be configured as a phono input with the addition of an optional board, as well as an XLR input for balanced sources. A BY‑PASS input allows it to be integrated into a home theater system.

Enhanced user comfort with well‑thought‑out features

Atoll Electronique has equipped the IN300 Evolution with practical features for an optimal user experience. Balance settings can be memorized, allowing you to easily compensate for acoustic imbalances. Inputs can be renamed for easy identification. The high‑contrast OLED display can be set to stay permanently on or to switch off automatically. Finally, the supplied system remote control allows complete control of the amplifier from your armchair.

Upgrade options to match your needs

The IN300 Evolution is designed to evolve along with your needs. It can accommodate the optional DA100 and DA200 boards to add extra digital inputs, as well as the P50 and P100 phono boards for compatibility with MM and MC turntables. This modularity makes the IN300 Evolution a long‑lasting amplifier, capable of adapting to changes in your system.

Smart operation for controlled power consumption

With environmental concerns in mind, Atoll Electronique has equipped the IN300 Evolution with intelligent standby modes. The low‑power mode keeps consumption below 0.5 W, while the preheat mode, with a configurable standby delay, keeps the power stages at their optimal operating temperature. On startup, a gradual power ramp‑up stage avoids consumption spikes. In operation, power consumption ranges from 29 W to 700 W depending on listening level.

First‑class electronic performance

The IN300 Evolution boasts outstanding technical specifications. With an input impedance of 220 kΩ, a maximum input level of 3.5 Vrms, and a sensitivity of 450 mV, it interfaces easily with a wide range of sources. Its 100 dB signal‑to‑noise ratio and distortion of just 0.05% at 1 kHz (10 W) attest to its excellent linearity. Its wide bandwidth from 5 Hz to 100 kHz and fast 2.0 μs rise time ensure full reproduction of the musical signal.

Can the IN300 Evolution be easily integrated into a home theater system?

Yes, the IN300 Evolution has a dedicated BY‑PASS input allowing it to be connected to a home theater processor. In this configuration, the amplifier is used as a power amp for the front speakers, while the processor handles decoding of multichannel audio tracks and volume control.

What are the advantages of the IN300 Evolution’s dual mono architecture?

The dual mono architecture of the IN300 Evolution offers several advantages. By completely separating the left and right channels, from the power supply right through to the output stages, it reduces crosstalk between channels and improves stereo separation. Each channel benefits from its own oversized toroidal transformer, ensuring ample power reserves and optimal dynamic response.

Is the IN300 Evolution suitable for use with low‑sensitivity speakers?

Thanks to its power of 2x150 Wrms into 8 Ω and its ability to deliver 2x260 Wrms into 4 ohms, the IN300 Evolution is perfectly capable of driving low‑sensitivity speakers. Its substantial current reserve and low output impedance allow it to keep a firm grip on the drivers, even the most demanding ones, without ever faltering.

What customization options does the IN300 Evolution offer?

The IN300 Evolution offers several customization options. Inputs can be renamed for easy identification. The memorized balance control allows fine adjustment of the level between the left and right channels. The OLED display can be set to stay permanently on or to switch off automatically after a few seconds of inactivity. Finally, the standby mode can be configured either for low power consumption or for preheating of the power stages.

What technologies are used to ensure great stability and low distortion?

The IN300 Evolution employs several technologies to guarantee great stability and low distortion. The triple push‑pull output stages with MOS‑FET transistors biased in class A/B provide linear operation and wide bandwidth. Bipolar transistor and LED‑based current sources ensure perfect voltage stability. Finally, the high‑quality, low‑ESR filtering capacitors and shielded MKP coupling capacitors contribute to the transparency of the signal.

Technical Specifications

Power Supply and Electrical Management

• Transformers:
  • 2 × 440 VA (toroidal) for audio stages
  • 1 × 10 VA for digital stages
• Soft start anti-surge system
• High-end Absolue Créations power cable
• Filtering capacitors:
  • 12 × 6,800 µF high-quality, low equivalent series resistance (ESR) Atoll
  • Total capacity: 86,150 µF
• Current sources with bipolar transistors and light-emitting diodes (LEDs)
• Standby mode: low consumption or preheating

Design and Materials

• Front panel: 8 mm brushed aluminum
• Chassis: 2 mm steel
• Double-sided printed circuit boards with nickel/gold finish

User Interface

• High-contrast organic light-emitting diode (OLED) display (permanent mode or 5 s auto-off)
• Balance adjustment/memory
• Customizable input names
• Atoll remote control included

Audio Performance

• Effective power/channel: 150 W (8 Ω), 260 W (4 Ω) at 230 V
• Input impedance: 220 kΩ
• Maximum input level: 3.5 V effective
• Sensitivity: 540 mV
• Signal-to-noise ratio: 100 dB
• Distortion (1 kHz, 10 W): 0.05%
• Frequency response: 5 Hz - 100 kHz
• Rise time: 2.0 µs

Output Stages

• Dual mono architecture
• Triple push-pull with metal-oxide-semiconductor field-effect transistors (MOSFETs)
• Class A/B biasing
• Minimal feedback
• Anti-surge protection at startup

Input Stages

• High-quality shielded metallized polypropylene (MKP) capacitors
• Shielded Mundorf metallized polypropylene capacitors
• Dual volume attenuator (1 per channel)
• Symmetrical stages with discrete bipolar transistors

Connectivity

Analog Inputs

• 5 line inputs (including 1 optional auxiliary for turntable)
• 1 bypass input
• 1 balanced input (XLR)

Outputs

• 1 pair of speaker outputs
• 2 preamplified outputs
• 1 headphone output (6.35 mm)
• 1 12 V trigger output

General Characteristics

• Power consumption:
  • Off: 0 W
  • Low standby: < 0.5 W
  • Preheating: 27 W
  • Operation: 29-700 W
• Dimensions: 440 × 365 × 103 mm
• Weight: 16 kg

Available Options

Digital-to-Analog Converter Card (DAC200)

• AKM-AK4490 converter
• Signal-to-noise ratio and dynamic range: 120 dB
• Compatibility:
  • Direct Stream Digital (DSD): 2.8 MHz, 5.6 MHz
  • USB-B Pulse Code Modulation (PCM): 16-32 bits / 384 kHz (asynchronous)
  • Coaxial/optical PCM: 24 bits / 192 kHz
• USB XMOS XUF208 interface (Atoll firmware)

Phono Card for Auxiliary Input

• P100 (configurable moving magnet/moving coil) (MM/MC)
• P50 (moving magnet) (MM)