They are magnetic, but very weak. The drivers have a much stronger and more concentrated magnetic field, so these little magnets make no difference at all.

I looked at the upgrade a while ago and it looks great, but maybe a bit pricey. The main thing that could affect the sound seems to be that one little piece of foam. Still, I really respect their commitment to making their products maintainable for end users - so many companies actively try to lock things down these days that it’s really refreshing to see this kind of stance. For me, I see “maintainable” as “hackable”, so I’m probably going to keep on fiddling with my S4.

If you want reference quality rather than isolation, the S4X is absolutely what you should go for.

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