Yes. Me also facing same here but after try Blu-ray movie with dolby atmos,both rear speaker become loud. Make sure your blu-ray player must support dolby atmos/dts-x version. Once start play the movie, samsung q90r led display will show you Dolby-Atmos, at that time you can feel how loud rear speaker and the surround sound for all speaker sound become crystal clear. Try watch Blu-ray Mad Max Fury Road with dolby atmos. 100% you will satisfy.
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