Sound output from speakers too low

I recently purchased the Mixtrack Platinum controller and I also have a SubZero SZS-P8A Active PA Speaker. I tried connecting the two via an RCA cable and although there is some sound it is still very low volume. I’ve tried sorting out the master gain on the controller etc but the same thing happened with a different set of speakers aswell so I’m just wondering if there’s something I have to adjust in order to get the proper sound output from the speaker I’m using or what do I have to do?
Any help would be much appreciated.
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