I have measured a substantial DC offset at the boards RCA connectors when the 4way-iir-delay-mixer-asrccontrol.xml profile is installed (in order to use the analogue input of the DAC+ DSP Add On).
I have two DAC+ DSP boards and measured the following:
Board 1: L - 0.238 V R - 0.542 V
Board 2: L - 0.623 V R - 0.157 V
Board 2 with DAC/ADC Add On board L - 0.842 V R - 0.180 V
With DAC+ DSP Universal V10 profile installed the outputs measure ~ 0.001 V in all cases.
If you are able to reproduce, can it be rectified?