Thanks Tony,

but I think it will not be possible to do this, because my amp do the Subwoofer channel separation. It has four line inputs (Left Front, Right Front, Left Rear, Right Rear) and five speaker outputs (LF, RF, LR, RR and Subwoofer). So I will have to fins another way to control teh Sub Level. I tried the equalization but could not find a satisfatory solution.

Thanks again.