Pro Audio Support

Q:
Does 5.1-channel Dolby Digital make Dolby Surround obsolete?
 
A:
No. Dolby Surround will continue to be a preferred method for delivering surround encoded content within the space of a stereo signal. This is why all Dolby Digital decoder units also incorporate a digitally implemented Dolby Surround Pro Logic® decoder.

Programs encoded in Dolby Surround can be played back in mono, stereo, or with a Dolby Surround Pro Logic decoder that recovers the four original channels. These programs can also be played in Dolby Pro Logic II for five independent full-range channels.