All eight analogue input channels feature balanced line inputs on TRS jacks, with dual switchable sensitivity to allow connection to professional or consumer line-level sources. The '+4dBu' setting accommodates professional signals with a nominal level of +4dBu and allows a maximum level of +18dBu (0dBFS). The '-10dBV' setting accommodates consumer signals with a nominal level of -10dBV and allows a maximum level of +6dBu (0dBFS). Unbalanced sources are automatically accommodated.
All of the input channels also have balanced XLR microphone inputs, with gains variable from 10dB to 65dB in accurate 1dB steps, and with individually switchable phantom power. A -20dB pad is also selectable for each microphone input individually.
Input channels 1 and 2 also have high-impedance front-panel unbalanced instrument jacks, also with fine and accurate gain control.
Selection of input modes is automatic: line input mode is automatically selected whenever a TRS jack is inserted into the rear-panel combo connector, otherwise mic input mode is selected. On channels 1 and 2, mic input mode is automatically over-ridden whenever a mono plug is inserted in the front-panel instrument jack.
The input mode and phantom power state of the input channels is indicated on the front panel of the unit, and also in the Inputs tab of the Atlas Control Panel app. Line, mic and instrument gains are also adjusted in the Inputs tab, as is selection of the Overkiller, high-pass filter and MS matrix functions described in the following sections.