Unless you force it to some other surround mode, most receivers will use Dolby Pro Logic or Pro Logic II as the default surround mode for Dolby 2.0 source material.
Alternatively, You could play it in 2-channel Stereo, 3-CH stereo, DTS Neo:6, 5-channel stereo, or one of the ghastly DSP Reverb-o-rama modes.
There are not many instances when Pro Logic or Pro Logic II would not be the best option. Virtually all Dolby 2.0 soundracks are Dolby Surround encoded and should be played with Pro Logic or Pro Logic II decoding. Even those that are not matrix-encoded will generally work pretty well with Pro Logic or Pro Logic II.
DD 2.0 simply designates two discrete channels of sound compressed using Dolby Digital encoding. Nothing more, nothing less. The contents of those two channels can be anything from mono (same sound in both channels) to stereo to multiple channels of information that have been folded down to two channels using matrix encoders like Dolby Surround or LOGIC7 or Circle Surround.
Two channel soundtracks that have additional channels folded in using matrix encoding can be recovered to the original multiple channels using similar matrix decoders. Since the additional channels were mixed in using specific encoding techniques, the additional channels will decode to the appropriate location: i.e., centre content will go to the centre speaker, surround content to the surrounds, etc.
Modern matrix decoders, like Pro Logic II or LOGIC7 or Circle surround II, not only work with matrix encoded DD 2.0 sources but also do a pretty good job regular stereo DD 2.0 material. Even without the additional channels matrixed in, a good matrix decoder should be able to create an exciting and natural sounding multi-channel presentation out od stereo material.
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