What's the best filter set up for Classical music?
I like more blue back and black front filters for classical.
Another long term A4 user here, and no complaints until recently noticed the dreaded fading volume in one unit. Only one unit, never the other, and having read through some of the more recent posts I suspect it just got sweaty in my ear. I'm hoping it's just the filter (I use black / black), and the sound returns the next day (it's happened about 3 times now in listening sessions of 45+ minutes). I've swapped the nozzle filters over to see if they're the culprit.
It happened to my A4s a couple of times and once to my A6s. Always was a moisture issue and was solved keeping the IEMs + the filters + a silica gel bag in a nice closed recipient for a couple of days (or at least for some hours).
EDIT: In my case the issue was always in the front filters and not the IEMs, but it is advisable to do it to the A4s too when the moisture is already affecting the filters.