You must manage your gain-structure when applying DSP plug-ins, because any DSP adds bits to the file and increases the dynamic-range/level.
When you are applying EQ, you must manage the output level gain… This is easiest done by engaging ‘Auto’ in the output gain control that will automatically compensate/makeup for equalization adjustment that will overload the signal presented to the plug-in architecture and/or the output level delivered to your DAC.
Just inserting a plug-in adds approximately +2dB of gain per plug-in, so you must lower the output gain to avoid overloading the DAC architecture…
The A1 Stereo Control may have auto-makeup engaged by default or just part of its normal operational functionality.
Try lowering the Audirvāna output Volume level by about -6dB to start, with Studio EQ engaged with ‘Auto’ gain control enabled and Redline Monitor inserted as your only plug-in.
In LPCM digital audio, dynamic-range is calculated as [6dB x (number of bits) + 1.75(mv) = Theoretical Dynamic-Range in millivolts]… (Where one (1) bit is equal to (+/-)6dB in level) … The theoretical dynamic-range of a 24 bit file is calculated thusly: [6 x 24 + 1.75 = approximately 144dBmv]… I tell you this so you understand that lowering the Volume output of a 24 bit file by -6dB, lowers the dynamic-range by 1 bit, to approximately 143dB which is inconsequential in the playback scenario… Your DAC is not capable of reproducing 144dB of dynamic-range and more-likely-than-not, incapable of reproducing 125dB of dynamic-range.
This presumption is way off-base… 
It appears your DAC doesn’t have a lot of dynamic head-room…
