Do I have to use both the R and L main output on the Behringer Xenyx 1002 mixer to the channel 1 and channel 2 input on the Crown CTs2000 amplifier? I would rather use just one output on the mixer and one input on the amplifier if possible. The amplifier has a "Y" switch to put the same signal on both channels. I am hooking up a 70v system so I just need a mono signal. I guess I'm asking if that would hurt the mixer in any way?