Numark DJio output problem

Have a Mac version 10.10.5, using Numark mix track 2 and trying to set everything up with Numark DJio. Have my headphones plugged in and speakers plugged into the output 1 but the L speaker won't play sound, and the right will crackle if I move the wires. Plugged the speakers straight into my computer to test them and they were perfect. Is it my DJio? Help!!!!!!
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