Hi Mike, For your Samsung HW-T650 Soundbar, there is no center channel adjustment. If you are finding the dialogue is being drowned out in action scenes and too low to hear in other scenes, try using Dynamic Range Control (DRC). DRC lets you apply dynamic range control to Dolby Digital tracks. With DRC turned on, loud sounds will be reduced.
1) Turn off your Soundbar.
2) While the Soundbar is off, press and hold the Sound Mode button on the remote control for 6 seconds until you see “DRC ON” shown on the display.
3) To turn off DRC, repeat steps 1 and 2 above. ^Patty