I have these IEMs since 2016. I don't remember, if white filters came with foam or not. But I have been using them with no foams. Lately, I wanted to try different settings. I remember removing all material from black and blue to try different setting, but the sound seemed harsh.
My current configuration is white filter with the ending V shaped material, and small piece of custom foam (that I cut from some material). After years listening without any foam, I recently ordered black filters, and when I tried them, I immediately felt, the sound was not very open. I re-created (just to try) similar sound by putting custom foam (in my old filter), by compressing more foam quantity.
As mentioned above, my current configuration is white filter, with very light custom foam (so that it kills some of the harshness). After listening this many years with one set of configuration, I am not a fan of any of the black foams. For information, I noticed black filters have 2 foams, joined together, and blue have 1 (probably same material, but difference in quantity).
Apart from filter mod, and SpinFit tips, recently I am trying other configuration.
- I bought TRN 8 core silver cable. I was already using soft mmcx connector cable from another headphone, but that stopped working, also one of the original cables from Shure started losing sound from left side, when I move my head. This cable is also not very comfortable, but they are good enough. Comfort is not that bad, if I leave more space around the ear. In terms of sound, I cannot say if it improved or not.
- My next upgrade was buying a headphone amp from FIIO (K3), for my laptop. I noticed, it improved the sound quality, specially in high frequency. I can notice in high frequency it improves how the instruments and singers sound. My external DAP (Fiio X3 2nd gen), don't have that problem, so probably does not need a DAC/AMP.
- Apart from these settings, I recently starting reading about how Shure has frequency dip around 10k. I never had problem with these IEMs' sound, but just for fun, I am trying a new equalizer setting in my audio players, as suggested in this
AutoEq page. As the page suggests pre-amp subtraction, so for players that don't have pre-amp setting, I used the adjusted values. E.g. -8.5, -8.0, -9.0, -8.5, -8.0, -7.5, -6.5, 0.0, -8.5, -6.5 for QuodLibet music player. You need to increase volume after such reduction of frequency values, so be careful, when switching to something else. I am thinking, this pre-amp setting helps in sound clipping. As for DAP, since I don't have pre-amp setting and this large range, I am using a -4 db subtraction from all values. This setting, definitely brightens the upper frequencies. I have been using this for around a month and seems to adjust my hearing towards it. Initially though, it might sound quite bright.
However, I don't dislike how it sounds, even when I disable the equalizer. May be its up to individual, on how they want to experiment.