minimum in call volume on lg g2 and samsung s4 too high using headphones

I have tried the Apple and Klipsch earbuds with LG G2 and Samsung S4, however, both phones have a minimum *in-call* volume that is still excessively loud for me. What are some possible solutions? This is not the case when using an iPhone. I saw https://android.stackexchange.com/questions/16313/minimum-volume-is-too-high-with-headphones suggested getting an inline volume control. Will this only work for music or phone calls as well? I have tried equalizer apps like Fine Volume Control but these work only for media and not in-call volume, which is my main issue.