using Polk Omni DLNA speakers with Mac Book Pro

I have purchased Polk Omni S2 Wireless Speakers. Polk only offers iTunes via an app on iPhone. It does not play Apple Music and will only play music downloaded from the cloud, which takes up too much memory on my phone. Polk offers a link to software that supports playing music from a Windows PC:

(Downloading the DTS Play-Fi PC App) but this is not supported by OSX. For OSX, Polk suggests "Because OSX devices don’t support DLNA, a third party software (ex. Twonky, Plex or Servio) must be downloaded for them to be visible to the network. Once downloaded, all locally stored content on OSX-based devices will show up within the Polk Omni App under “Media Server.”

Is anyone out there familiar with these services and how to best use them? All I can gather from the Apple site is that you need to use Airport Express but I already have a wireless router and I don't want to set up a separate network just to play music off these speakers I wish I had never purchased.

Let me know!

Thanks