Maybe try different medical adhesive tapes as they have all different porous, this is what I did in my yet best PK shell, the sound is much affected depending on how those tapes are "breathing" (not sure if I'm clear enough?)So, just pulled my v1 earbuds off burn-in.
With the tuning foam I bought over the vent holes it is very clean/clear but bass rolls off early in thr midhbass or low mids. Sounds like my ACG, but with even less bass. Without the foam it has bass, but has way too much mid-bass.
Any tuning tips on how to reduce mid-bass but keep the bass & sub-bass?
Generally, the more you have holes (or enlarge a single hole) into shells and the more you will have a little more of sub-bass but especially mid-bass impact and less sibilance in the highs while mids generally stays almost the same.
Depending on drivers used, it can be a good trick to try. Sometimes I still don't have the right balanced sound to my ears so generally I prefer to use other drivers (if equalizer is not enough).
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