Celestion at b&c yn ang supplier ng qsc na ginagamt sa box nla. I only know jbl, ev,das,rcf, cv manufacturd ther own driver at the same time box. Most professional speaker manufacturer, b&c ang provider ng driver nla even famous l-acoustic sa b&c. Nexo,turbosound, bose, d&b, yorkville sa b&c. good engineering tong b&c