Stream Audible audio to DLNA/UPNP speakers

I would like to listen to my [Audible audio books](https://play.google.com/store/apps/details?id=com.audible.application) on external speakers because the tablet's internal speakers are too weak and headphones are not always practical. In another my post, https://android.stackexchange.com/questions/190837/stream-any-audio-to-dlna-upnp-speakers , I asked if there is a generic solution to stream audio output from any app on my Android devices, if there is no generic solution then have anyone figured out a specific solution for Audible? Audible doesn't seem to support external players, so I cannot use [BubbleUPnP](https://play.google.com/store/apps/details?id=com.bubblesoft.android.bubbleupnp) like I can with [BeyondPod](https://play.google.com/store/apps/details?id=mobi.beyondpod) for free podcasts. I have nice external speakers, Panasonic SC-NE5DBEB-K by the way. When I am home, my tablet and speakers are on the same home wireless network, I would like to listen to Audible when doing household chores for example, but the tablets internal speakers are too weak, I have to move around the house, it sometimes noisy and headphones are not practical, I still need to hear other people too.