In CQ-20B I find there is a HPF in every channel which can’t be turned off (encircled in red in the attached picture). Can anybody tell:
Why this filter pole is there?
Does this influence music played through such a channel? If I listen to music through a channel it clearly lacks low-end, unless I specifically boost it again using PEQ.
What is the implication of this filter pole on for example a kick drum mic?