Anyone else try the Pentaconn Brass core tips?
Was using spring tips previously to dampen the upper treble spikes.
These tips seem to "focus" the sound except for the upper treble frequencies. The sound comes through denser with more weight, effectively making the upper treble less prominent.
If you're like me and like Annihilator like sound (read: aggressive and engaging with extended treble), the PR1 Pro are the best planar iems imo. I slightly prefer it over the Zetian Wu Heyday for its better extension and more powerful presentation of the bass to lower mids.
There is a caveat though, J-pop. They tend to be more intense and actually need to be toned down, not up (which is why I still have the IER-M9s)