Have you had any luck finding what the problem is?
I don't think the equaliser is the problem as I've moved everything back to default settings and it didn't make a difference.
I've noticed that the static doesn't stop immediately when I stop playing music, it stops about 10 seconds afterwards. The loudness of the static noise is also independent of the music volume. Actually, even if the volume is turned all the way down, there's still static as long as music is playing. I don't think a faulty headphone jack or something like that could cause this... Could it be a faulty DAC?
I've tried returning my phone but I was told Samsung doesn't offer any warranty... strange.