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Have Onkyo 605 receiver with Sony 350 Blu Ray player. DVDs use all of the 5.1 channels, but when a Blu Ray disc is played, there is no sound from rear speakers. Anyone have any ideas?

Hmmm, first question (to remove the obvious), which Blu-Ray are you using?

 

Any Blu Ray disc. Could this be a firmware problem as 350 Doesnt  support DTS Hd Master  audio

Shouldn't be an issue as your Onkyo 605 can decode the DTS HD Master Audio formats so as long as the settings are correct, it should be fine.

Assuming your 350 is connected into the Onkyo with an HDMI cable, let's do a basic check of the settings, as per page 44-45 of the manual, under Audio Settings, have you got Audio Output Priority set to HDMI, Audio (HDMI) set to Auto, BD Audio Setting set to Direct, Dolby Digital set to Dolby Digital and DTS set to DTS?

 

BD Audio setting was set to mix. So changing to direct has solved it.Simple really.

Thanks for your help