PJ,

I'll try to help and hope you have a remote like mine. I have the RC-921. About halfway done on my remote there is a backlight button. To the right of that button are some buttons labeled in blue, such as Dolby/DTS surround, cinema and music. I'm sure you want to press the DTS button and you can pick either Neo6 or DPL2 there if you wish. I don't think there is such a thing as 6 channel stereo, only 5 channel or 7 channel.