Level 7

Sub-woofer not active

Hi Everyone

I have a 58 inch Hisense (Roku) TV R6 

I hooked it up to a receiver for surround sound 5.1 using the optical audio ports. I have a Yamaha powered subwoofer attached to the receiver. I got sound through all 5 speakers in theater mode but nothing from the sub. Any ideas/ suggestions as to why this is? The sb works great for CD,s through the same receiver.

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