How to connect my bose old cinematic series 2 with lg oled c7p???

Apr 8, 2018
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Hi i just bought oled lg c7p....and i m trying to connect my old bose cinematic gs series 2 with my tv through optical cable ....but this lg tv does not get connected ??? Can some1 help me what i m doing wrong??.....do i need any audio converter or not.....???