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See this help article as it likely resolves your issue in selecting the secondary master output.
Hi,
I have a DDJ-RB and i seem not to get audio through my speakers that my computer is connected to. I can hear through headphone however. What i have noticed from looking around in these forums is that people seem to have in there master output "ASIO: Master + Realtek High definition". But on my master output i just have "ASIO: Master". How do i get ASIO: Master + Realtek High definition to show as a selection under master output.
Thanks
Ben
See this help article as it likely resolves your issue in selecting the secondary master output.
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And the purple speaker is on, next to the MIDI settings button.
Thanks for the quick response, i had followed the guide on the article and still seem too get this issue 
And did you go to the Setting Utility to configure the PC MASTER ASIO ?
Correct ive checked this and clicked my speakers. Thanks for quick response again by the way pulse. I think found the issue, every time i plug in my controller i have to change my sound settings to speakers being default rather than DDJ-RB as explained in the article you showed me, then restart rekordbox and my controller. However this procedure has to be followed every time i plug in my controller which is abit of a pain however this seems to be resolving my issue so far. If i have any further problems i will let you know
Thanks
Ben
Thanks for reporting back with that info - it does help to know that's the case and we may need to update our instructions as a result. Cheers.