My box is by Q-LOGIC how do I read the port tuning chart?

[adamawayfrommpa]

I don't know what VAS ft. means or what FS means on the sides of the chart....
Adam Chandler

[SAVAGE SOUND]

FS IS THE FREQ. THAT YOUR SUB IS TUNED TO AND VAS IS THE SPACE NEEDED BY YOUR SUB TO OPER. AT TOP LEVEL. IF U CALL THE MANUF.WITH THE MODEL NUMBER THEY CAN GIVE U THE INFO.