Macs and 5.1 surround sound


i have 5.1 system logitech connected macbook pro through sound blaster omni surround 5.1. setup correct because audio test performed sb omni control panel activates correctly each speaker individually. same audio midi setup utility in mac os x: configured output 5.1 sound , activates correctly each speaker during test.

far good. problem when play movie dvd or itunes, has 5.1 sound, have stereo output. affects both dvd player , itunes in 2 machines, 1 under snow leopard , 1 under yosemite. tried open dvd vlc , says system audio not configured 5.1 sound , have through audio midi setup. configured correctly, therefore, reason, mac os x applications fail see setting.

of course if enable sbx pro studio enhancements in sb omni control panel have audio speakers if understand well, enhancement, kind of simulated surround sound.

@ point ran out of ideas. suggestions, solutions?

thanks!
 

movies encoded in dolby digital or dts need decoder them. soundblaster have it? use receiver, optical cable , works flawlessly.
 


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