you have to get main speakers for a home theater system. Sound Qualityis really important to enjoyable listening. Center channel is great because it doesn’t contaminate the main speakers with voice stuff. less muddy pure music.
Need a large subwoofer makes all the difference in the world
Surrounds are nice if you have a big enough room.
Invest in Quality amplification and A processor of quality. Stay away from integrated stuff.
That’s a really really really big screen you have. 85 inches seems too large