Share your experience!

I do have the same problem.
When I try the first time using original earphone, I tought the problem is from the original earphone.
So i bought MH-EX300, and the problem still happen.
When the song get so boomy, the vocal volume will decrease.
glad to hear that i'm not the only one 
Something that would be worth checking is if you have the Dynamic Normaliser enabled: Main Menu > Walkman > Menu Button > Settings > Sound Effects > Untick Dynamic Normaliser.
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Sam, it does make a difference, but the problem still there. the vocal volume still get lowered
Thank you for your assistance Sam 
But it's not Dynamic Normalizer's fault.
Tried to turn it off and on and off, no difference at all
I'm Xperia SP user I have it same issue, I found this problem after first update by "update center", I try anything to fix this problem but it does'n work 😛 I think this problem is relate sound enchancments software, please check and update us, we're love "Clear Bass" function Plz help....