A:AnswerHello, yes, that Insignia system will connect easily to your new Roku 65" Pro TV & you can control the volume with your Roku Remote or the included Insignia remote.
Hope this helps.
A:AnswerAfter having the same issue, my solution was to change my soundbar input from auxillary to HDMI (eARC) and then change the audio type within my tvs settings from auto to stereo (Roku tv). Im sure most tvs have similar settings so it might be worth giving these a shot.
A:AnswerThe SB512 is a eight channel surround sound system - it has three front channels LCR & two upfiring speakers for height in the soundbar plus two surround channels and a subwoofer, hence 5.1.2
LCR + LR Surround = 5
Subwoofer = .1
Height channels .2