Uhoh429

So I am running my new Crown XLS 2000 in Input Y mode, which if I understand correctly sends signal from channel 1 input to both channel outputs. So I am feeding my two 12" main speakers, which each handle 400W @ 8 ohms, and want to control the level of each speaker with its respective pot. The issue that I am having is that even though each channel pot is turned all the way down, channel 2 still sends signal to the speaker. Furthermore, the volume level on channel 2 doesn't change until the pot is turned about 1/4 of the way up.

Is this normal?  

Thanks in advance