The Auzen X-Fi Prelude 7.1 has an SPDIF Input port that accepts only stereo PCM format from the external device such as your PS3 or xBox game console. The sound can be up-mixed to 5.1 channels and encoded to DDL or DTS surround sound.

If the audio source is LPCM format(5.1 channel DDL or DTS), it cannot be transferred through the SPDIF Input port, because the Auzen X-Fi Prelude 7.1 decodes the LPCM format in Software.