Atoll IN100 Signature - Silver
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The Atoll IN100 Signature is an integrated amplifier designed for music lovers seeking a genuine high-end audiophile experience without the price typically associated with this level of performance. Its true dual-mono design — exceptionally rare at this price point — immediately sets it apart from most integrated amplifiers in its class.
Each channel benefits from its own dedicated power supply with two 340 VA toroidal transformers, complemented by fully discrete audio stages and Class A/B MOSFET amplification. Delivering 2 × 100 W into 8 Ω and 2 × 140 W into 4 Ω, this architecture provides generous current reserves and excellent channel separation, translating into tight, articulate bass, an open and natural midrange, precise highs and remarkable control over the loudspeakers.
The Atoll IN100 Signature can receive the following optional boards:
- DAC boards: DA100 and DA200.
- PHONO boards: P50 and P100 (can be combined with DAC boards).
Atoll Electronique’s philosophy is more than using high-performance schematics: it’s a consistent approach and rational design, implementing the highest-quality components while maintaining an exceptional price-performance ratio.
We opted for metal chassis, front panels, and discrete component circuits biased to Class A for the preamplifiers and Class A/B for the amplifiers. The power transistors we use are MOSFETs because they offer the advantage of high efficiency with remarkable audio performance.
We strive to satisfy our customers to the maximum by offering them products of the highest quality. The reward for our efforts: musicality, fluidity, richness of timbre and sound detail, an extraordinarily realistic liveliness for a faithful reproduction of your favourite music. It is essential to enhance the enthusiasm of a vast panel of customers since the creation of Atoll has unanimously validated our efforts, an enthusiasm confirmed by numerous distinctions awarded by critics in France and abroad.
All components are inserted and welded at the main factory in France (Brecey, Normandy). We take great care in the handmade assembly and test procedure, which involves four steps: checking, controlling, and checking each unit before shipment.
The warranty is valid for two years from the date of purchase. The warranty applies to products that have been used correctly and in accordance with the manufacturer's instructions.
2 × 140 W
Watts RMS / 4 Ω
With 2 × 100 W into 8 Ω and 2 × 140 W into 4 Ω, the Atoll IN100 Signature delivers confident, dynamic amplification with the control and energy needed for a wide range of loudspeakers.
31,474 µF
Total of capacitors
Its substantial filtering capacity, supported by two 340 VA toroidal transformers, provides the energy reserves needed for fast transients, controlled bass, and expressive musical dynamics.
Designed for musical precision and control
Designed and manufactured in France, the Atoll IN100 Signature perfectly reflects Atoll’s philosophy: investing where it truly matters for the music. Its dual-mono architecture, generously engineered power supply, MKP coupling capacitors and double-sided nickel/gold circuit boards demonstrate a level of engineering more commonly found in considerably more expensive electronics.
With a bandwidth extending from 5 Hz to 100 kHz and a rise time of just 2.5 µs, the IN100 Signature combines speed, precision, and excellent transient response to preserve the energy and natural character of every performance.
IN100
Where power, precision, and musicality become one
The Atoll IN100 Signature brings music to life with a wide, precise and remarkably three-dimensional soundstage, giving every voice and instrument its own natural place in the performance. Vocals have presence and texture, instruments breathe with clarity, while the bass combines weight, speed and control without overwhelming the rest of the spectrum.
What makes the Atoll IN100 Signature so compelling is its ability to combine detail, dynamics and musicality without sounding analytical or clinical. From an intimate vocal recording to the scale and impact of a full orchestra, it remains effortless, expressive and engaging. It doesn’t simply reproduce the recording — it draws you into the performance.
Discover the IN100 Signature
2 × 100 W RMS / 8 Ω – 2 × 140 W RMS / 4 Ω
31,474 µF
5 Hz – 100 kHz
2.5 µs
357 kΩ
100 mV
100 dB
0.05% (at 10 W)
13 W
440 × 305 × 95 mm
11 kg
- 4 mm brushed aluminum front panel with black or silver anodized finish
- 1.5 mm steel chassis for structural rigidity
- ALPS motorized volume potentiometer
- Aluminum control buttons and source-selection indicators
- Perforated top cover for effective heat dissipation
- Dual-mono power supply architecture:
- 2 × 340 VA toroidal transformers
- Separate power supply for each audio channel - 31,474 µF total filtering capacity:
- 4 × 6,800 µF main filtering capacitors - Soft-start power-on system
- Carefully engineered power delivery for dynamic musical passages
- Fully discrete audio stages
- Single push-pull MOSFET power output stages
- Class A/B output stage biasing
- High-quality MKP coupling capacitors
- Double-sided printed circuit boards with nickel-gold finish
- High-performance heat sinks with direct thermal coupling
- Integrated thermal protection
- Motorized ALPS volume control
- Front-panel source selection with LED indicators
- Monitoring loop for recording or external signal processing
- Standby/preheating functionAtoll global remote control available separately (not included)
- Optional digital and phono expansion boards
- 5 analog RCA inputs: AUX (or optional phono), CD, TUNER, DVD, and TAPE
- 1 BYPASS input for home theatre integration
- 1 TAPE recording output
- 2 analog preamplifier outputs for bi-amplification or subwoofer integration
- 1 × 12 V trigger output
- 1 × 6.35 mm headphone output
- Optional DA100 digital card:
- 2 coaxial inputs (24-bit / 192 kHz)
- 2 optical inputs (24-bit / 192 kHz) - Optional DA200 digital card:
- 2 coaxial inputs (24-bit / 192 kHz)
- 2 optical inputs (24-bit / 192 kHz)
- 1 asynchronous USB-B input (PCM up to 32-bit / 384 kHz and DSD up to DSD256)
- 1 Bluetooth input - Optional P50 (MM) or P100 (MM/MC) phono board
High-fidelity products, designed and hand-made in France
Dual-mono performance with natural musical expression
FAQ - Atoll IN100 Signature
A powerful and versatile integrated amplifier, the Atoll IN100 Signature combines dual-mono amplification, a generous power supply, and carefully selected components to deliver a natural, dynamic, and engaging listening experience. Its optional digital and phono expansion boards allow it to adapt to a wide variety of high-fidelity systems.
What are the main improvements of the Atoll IN100 Signature compared to the previous Atoll IN100 SE?
The Atoll IN100 Signature introduces refined circuitry, upgraded components, improved thermal management, and greater flexibility through optional digital expansion boards. It retains the dual-mono power supply and MOSFET amplification philosophy while offering enhanced connectivity and a carefully optimized design.
Is the Atoll IN100 Signature easy to install and use?
Yes. Its straightforward front-panel controls, motorized ALPS volume potentiometer, and clearly identified inputs make everyday operation simple. An optional Atoll global remote control is available separately for convenient volume adjustment and source selection.
What types of speakers can be paired with the Atoll IN100 Signature?
With 100 W per channel into 8 Ω and 140 W per channel into 4 Ω, the Atoll IN100 Signature offers generous power reserves for a wide variety of bookshelf and floorstanding loudspeakers. Its dual-mono power supply helps maintain bass control and dynamic expression. As with any amplifier, the final pairing should consider speaker impedance, sensitivity, room size, and listening preferences.
Can the Atoll IN100 Signature be integrated into a home theatre system?
Yes. Its dedicated BYPASS input allows the Atoll IN100 Signature to operate as a power amplifier for the front left and right speakers when connected to a compatible AV receiver or processor with preamplifier outputs. In this configuration, the home theatre processor manages the volume.
What digital sources can be connected to it?
By adding the optional DA200 card, the Atoll IN100 Signature opens up to the digital world with two optical inputs, two coaxial inputs, a USB input, and even a Bluetooth input. This allows you to connect most current sources such as a CD player, a streamer, a computer, a TV box, or even a smartphone. The optional DA200 DAC board supports PCM up to 32-bit / 384 kHz and DSD up to DSD256 through its asynchronous USB-B input. Its coaxial and optical inputs support PCM up to 24-bit / 192 kHz.
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