The Atoll IN100 Signature model belongs to the entry-level of High End components and is second only to the flagship in the Atoll Electronique line of full-range amplifiers. The device received a recommendation from the authoritative Stereophile magazine.
The design of the amplifier is quite original. The half-centimetre thick aluminium facade accommodates a large knob of the motorised volume control implemented on the ALPS potentiometer. To the right of it there is a mini-jack for headphones, a power button with an indicator and two vertically placed keys that allow you to select one of the required inputs. Switching is provided by a relay, and it is indicated by six green LEDs arranged in a semicircle.
Atoll IN100 Signature differs from its younger brothers by its increased power - 100 W per channel (at 8 Ohms). Channels are powered by two massive toroidal transformers with 330 W each, located on the left side of the case. The total capacitance of the PSU capacitors is 30,000 µF. MKP polypropylene capacitors are used in the circuits. The amplifier circuits include bipolar transistors, and the output stage is equipped with high-current Mosfet transistors.
There is a standard set of inputs: four linear RCAs, an input for monitoring recorded material, and RCA jacks labelled as By-Pass, which provide direct access to the amplifier's final section. The outputs are represented by jacks for recording and two Pre Out jacks. There are only two pairs of screw terminals for connecting speakers.
A phono preamp board can be installed as an option. The company's catalogue includes the following models of preamplifiers for internal installation: P50 (for MM heads) or P100 (for MM/MC heads).
Thanks to a powerful power supply, sophisticated circuitry and high-quality components, the Atoll IN100 Signature delivers excellent midrange resolution, expressive and detailed highs, and fast, articulate bass. The sound images built in space impress with their realism. The model is dynamic, well-balanced and impresses with its natural timbre.
