What are the different surround sound formats?
Dolby Digital (AC-3) Unlike most formats this one is digital, rather than analog. Signals for each speaker channel are transmitted separately, ensuring that each sound channel is reproduced exactly as it was recorded. There is a dedicated subwoofer channel as well. DTS Digital Surround Similar to Dolby Digital in that all signals are digital and separated by channel, but in DTS the signals are not compressed as much as they are in Dolby Digital. In theory, Dolby’s compression causes more loss of signal quality than DTS, but most listeners would probably not be able to tell the difference. Dolby Pro Logic / Pro Logic II Dolby Pro Logic and PL II devices can simulate surround sound from a standard 2-channel recording. Of course, this will not provide the quality or imaging that surround formats will, but it does a passable job of playing non-surround recordings on a surround sound system. PL1 will separate a 2-channel recording for a 5 channel system (2 front, 2 rear, 1 center), and PL2
