RCA Audio Output on DDJ-REV1

I connected my controller RCA Out with RCA cables to 1/4 inch unbalanced cables to my power Yamaha Speakers, so I could test that the audio was coming  out....it works!! My issue is that I need it to be connected to my Newmark Mixer since I have 2 turntables connected there and also, because is my main mixer....so I connected the RCA's to my input RCA in my mixer, line, well it doesn't work!!!!