Atoll’s IN200 Signature is an attractive if understated 120W per channel dual mono amplifier with a nice curve in its 8mm thick aluminium fascia. To keep the lines clean, however, it uses buttons in place of knobs and dials, which form the ergonomic brief of other integrated amps in the Atoll line. However, the IN200’s control surfaces (shared with the IN400 flagship) are well laid out with volume and balance buttons laid out in a logical diamond configuration. It’s tempting to throw in the ‘Gallic flair’ cliché here; the combination of its curves, ovals, and graphics gives the Atoll line a common, almost Art Nouveau look.
Apart from the volume and balance button diamond, the IN200 five line-only inputs – a optional phono stage can be added to one line input at a small premium – and a sixth marked ‘by-pass’. This allows you to use the power amp side of the IN200 only, which is useful in shared stereo/multichannel systems, or if you are upgrading to a pre/power system in stages. The IN200 also sports a fixed line input and output for a tape recorder (should you still own one) on the rear panel, and a solid ¼” headphone socket on the front.
Under the lid lies evidence of the IN200’s claim for dual-mono construction in the form of two mains transformers and a set of heatsinks on either side of the chassis. This explains how a fairly normal sized amplifier gets to specify an output of 120wats at eight Ohms that almost doubles to 200 watts into four Ohms. Two pairs of MOSFETs per channel should be up to delivering a decent amount of current when backed up by that kind of power supply.
 
The optional Phono P100 board, has a fully balanced diagram with discrete components, a configurable board (*) MM, MC low or high level with polarized discrete components in Class A, is designed to adapt to all cartridges on the market. In addition, the input impedance can be adjusted according to the turntable.
 
OPTIONAL PHONO P100 BOARD
Type: MM / MC.
Input impedance: 47 k ou 100 k (*).
Input capacity: 100 pF ou rien (*).
MM Gain: 40 dB (*).
High-level MC gain: 46 dB (*).
Low-level MC gain: 52 dB (*).
THD: 0,05%.
 
OPTIONAL DIGITAL BOARD:
A £350 optional board with several Digital Inputs is available, including:
1 Bluetooth receiver: Direct digital to the AKM audio converter
2 Coaxial Inputs (24Bits/192kHz)
2 Optical Inputs (24Bits/192kHz)
1 USB-B Input: PCM & DSD
Audio converter: AKM – AK4490
PCM from 16 bits to 32bits up to 384 kHz on USB-B input (asynchronous).
DSD : DSD64 & DSD128.