Much lower volume from BD player and apps than reg cable

[JensenBreck]

hello,

TV Sony x900e
BD player Sony UBP X800
Soundbar Bose Solo 5 using optical out from TV

Regular cable tv sounds great. If I leave the volume level the same when I put a 4K disc in or watch netflix or amazon the volume is much lower and have to turn it way up and still hard to hear, especialy dialog.

I been searching around and only thing I can find is a volume offset setting that I can't find on this TV.

Please help.
Thanks!

I didn't find the right solution from the Internet.

References:
http://community.sony.com/t5/4K-Ultra-HD-TV/Much-lower-volume-from-BD-player-and-apps-than-reg-cable/td-p/654708


Business Motion Graphics Example