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The 638 appears to have an optical input.

Main Rig:  CPU i5-4670k   MOBO Gigabyte Z97N-WIFI   GPU GTX 980ti    RAM 8GB  STORAGE 128GB ADATA(OS)/250GB Samsung 850 EVO(APPS)/3TB WD Red

AUDIO: AMP/DAC TEAC AI-301DA SPEAKERS: Cambridge Audio SX50 Phones: Philips Fidelio X1

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