[Dana Nielsen]

Hey Pete! Interesting. While I’m not familiar with the Logic nor Slate EQs you mentioned, I can say that a HiPass filter better not let any frequencies below the cutoff through! Haha. Unless, of course, the slope is gradual. I’m wondering if it’s your EQ’s slope that could be the culprit (measured in decibels per octave). I made a quick demonstration image, attached. Feel free to download the image for a closer look (click on the image and then the “download” button should appear below the image description)

Note: Not all EQs can create such steep slopes as the FabFilter, or the Weiss MP (which is another fav swiss-army surgical EQ I use a lot … and is on sale right now for $69 🤯).

Let us know if this sheds any light on your EQ situation!