I guess you read my post on Moondrop’s thread about removing Aria’s metal hex filter by clips
Unfortunately I haven’t seen any measurements of those, it basically improves overly dampened timbre (you will have more natural transient response) of stock Aria. From FR perspective, you will also have a little increase in upper mid area and 10khz+ and slightly lighter bass for increased visibility.
Back then Moondrop’s thread was still active and Moondrop official headfi account was following that thread. I sent feedback on Aria’s tuning and Moondrop acknowledged.
They come up with Aria SE ( basically Starfield’s reshelling project) and did improved that part.
From what I hear, the filter removed Aria Mod is basically what Moondrop did to their Aria SE tuning. Hope this helps.