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Montego DDL 19
LISTENING TO 3D GAME AUDIO When playing games that use DirectSound3D™, the Montego DDL surround sound processor converts the
3D positional sounds into HRTF positional audio so that the 3D effects of the game can be heard in
headphones or stereo speakers.
When using Dolby Digital Live to drive digital speakers via the S/PDIF output, the 3D positional audio
from the game will be converted to 5.1 positional audio on the speakers, to create a realistic and immersive
gaming experience.
USING DDL MODES IN VISTA/WINDOWS 7
Due to changes in the way the hardware works in Vista/Windows 7, there are now 2 DDL modes to choose
from - "DDL 5.1 Encoding" and "DDL Stereo Encoding". The end result of both modes is the same –
encoded 5.1 Dolby Digital Live output from the S/PDIF output. The use for each depends on what type of
audio is being played.
In XP/2000, when DDL mode is selected, stereo audio is ―upmixed‖ so that it is sent to all speakers (not
just the Front Left and Right), and 5.1 audio is encoded ―intact‖ into a Dolby Digital stream. Under
Vista/Windows 7, the ―upmixing‖ required the creation of the new "DDL Stereo Encoding" setting – this is
what should be used to allow stereo sources to be pushed out in DDL mode to all 6 channels of a 5.1
system. For audio sources that have discrete multi-channel audio (such as most popular PC games), the
"DDL 5.1 Encoding" setting should be chosen to ensure that the placement of each of the 6 audio channels
is correct in the encoded DDL output.
NOTE: When DDL modes are used, the Windows Vista/Windows 7 Playback Devices windows
should have ―Speakers‖ (not ―Digital Output‖) selected as the default Playback Device, even
though the S/PDIF connection is being used.