ADA, Okla. – The East Central University volleyball team secured the No. 6 seed at next week’s Great American Conference Championship Tournament by defeating Southeastern Oklahoma State University in four sets in the regular season finale at the Kerr Activities Center on Thursday night. ECU closes out the regular season 14-14 overall and 9-7 in conference play. The Tigers will open the postseason on Nov. 16 against Southwestern Oklahoma State University who earned the third seed in the tournament. “I think we played well tonight,” Head Coach Danielle Essix. “Southeastern pushed us, especially in set three. But I liked how…