Ah ok, I was thinking you were using a standard mixing board.
The problem is that the PA mixer you're using wasn't wired with separate L/R output jacks. The two output jacks are sending the same signal, just to two speakers at once.
Looking at what you have, I think you can still rig it up for stereo output.
The idea is to use a main output for one channel and a monitor output for the other channel. The monitor output will be on a separate circuit, so you will, in effect, have your left and right outputs. The problem arrives that in order to even give any juice to your monitor circuit, your level on that channel needs to be up somewhat, which would undermine total seperation but to a very small degree if you spend time balancing the output of the monitor master versus the main out.
The only thing you'll have to add to the equation is at least a single channel power amplifier for your monitor out, because your speaker won't be getting enough power from the monitor output. (UNLESS your monitor output is already powered and can drive your other speaker. It's worth it to check first.)
In theory, you'd set it up like this:
MUSIC PLAYER OUT to CHANNEL 1 & CHANNEL 2 input via Y cable.
----
CHANNEL 1
Turn down "monitor" knob to zero percent
Turn level and EQ to desired percent
Set main levels to highest optimal level
----
CHANNEL 2
Turn "level" knob to NEARLY zero percent
The "monitor" knob is now going to pose as your "level". Set it about 50 percent.
Duplicate EQ setting from channel 1
Leave mains alone
----
MAIN OUTPUT 1 to SPEAKER 1 (left)
MONITOR OUTPUT to POWER AMP to SPEAKER 2 (right)
----
Balancing your main output and your monitor output is going to be your biggest challenge. In order for your monitor output to have any volume to work with, it will have to get it from the channel level. This will cause a small bit of the right side of your audio to bleed into the left speaker because all the channel audio exits the main outs by default unless the channel levels are at zero percent.
To get your right channel (monitor out) loud enough to balance with the left channel (main out) and still maintain adequate seperation, you'll need to jack up your monitor master and experiment with the monitor knob on your second channel.
The object is to give the monitor channel just enough juice to work with without contributing to the main outs too much, and pumping up that monitor channel via monitor level controls until you have achieved a good seperation and equal decibel level between both speakers.
Anyway, if I've completely wasted my time typing all that because you don't want to go through the trouble... Don't worry.
I had fun.
Good Luck.
J.
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