Atoll IN100 Signature: Entry-level high-end amplifier

The Atoll IN100 Signature amplifier differs from its younger brothers in increased power – 100 W per channel (at 8 Ohms). The channels are powered by two massive toroidal transformers with a power of 330 W each, located on the left side of the case. The total capacitance of the power supply capacitors is 30,000 µF. The circuits use polypropylene capacitors MKP. The preamp circuits include bipolar transistors, and the output stage is equipped with high-current MOSFETs.

The design of the Atoll IN100 Signature amplifier is quite distinctive. The half-centimeter thick aluminum façade houses the large knob of the motorized volume control, implemented on an ALPS potentiometer. To the right of it there is a mini-jack for headphones, a power button with an indicator and two vertically located keys that allow you to select one of the required inputs. Switching is ensured by a relay, and this is signaled by six green LEDs located in a semicircle.

There is a standard set of inputs: four line RCA, an input for monitoring recorded material, as well as RCA connectors labeled BY-PASS, which provide direct access to the final section of the amplifier. The outputs are represented by connectors for recording and two PRE-OUTs. There are only two pairs of screw terminals for connecting acoustics. An optional phono stage board can be installed. The company's catalog contains the following models of correctors for internal mounting – P50 (for MM heads) or P100 (for MM/MC heads).

Thanks to a powerful power supply, thoughtful circuit design and high-quality element base, Atoll IN100 Signature provides excellent midrange resolution, expressive and detailed high frequencies, as well as fast, articulate bass. The sound images built in space impress with their realism. The model is quite dynamic, well balanced and able to amaze with the naturalness of its timbres.

The Atoll IN100 Signature is the entry-level high-end component and is second only to the flagship Atoll Electronique complete amplifier range. The device received a recommendation from the authoritative Stereophile magazine.

Characteristics of Atoll IN100 Signature

Nominal output power 100 W per channel (8 Ohms), 140 W (4 Ohms)
Pulse power 180 W Frequency
range 5 Hz – 100 kHz
Signal-to-noise ratio 100 dB
Inputs five RCA, one BY-PASS (RCA )
6.35 mm outputs for headphones, RCA for recording, two PRE OUT (RCA) connectors, 12V trigger Phono
preamplifier optional, branded modules P50 (MM) or P100 (MM/MC) are available for installation inside the preamplifier*
Power supply two toroidal transformer with a total power of 680 VA, total capacity of buffer capacitors – 31474 uF
Output to speaker systems two pairs of gold-plated screw terminals
Dimensions (W x H x D) 440 x 90 x 300 mm
Weight 11 kg