Can someone help? what does this do and how do i use it?

Thrush Silver Member Username: Thrushdtd New York Post Number: 136 Registered: May-05	Posted on Wednesday, June 22, 2005 - 15:42 GMT WHat is QFC control and what should i set it at?
Jake Davis Silver Member Username: Solacedagony New Jersey US Post Number: 504 Registered: Oct-04	Posted on Wednesday, June 22, 2005 - 16:12 GMT What is the make/model of the amp? Never heard of a QFC control before.
Thrush Silver Member Username: Thrushdtd New York Post Number: 137 Registered: May-05	Posted on Wednesday, June 22, 2005 - 20:14 GMT it is a us acoustics USX-1000d. its the Q factor control.