Music is not playing on center speaker when streaming music from Spotify iOS client

[violent_fm]

I used to have 2 channels speaker system, after I've added a center speaker, music is not playing only on that speaker while streaming from iOS client.
I am running on latest version on Spotify ios client, tried to reinstall, did not help.
That definitely not speaker issue, because when i am streaming from music center app, which is a native app for Sony receiver all speakers works well.
I can provide any supporting info if needed.