Originally Posted by Mr.G
^^^ Add this device to the list of other devices where 5.1 remains unsupported. Adobe is usually cited as the culprit.
Well, this is the info I too was looking for.
We are owners of the first generation Fire TV and HBO Now did not play in 5.1. We now have the second generation of Fire TV and as of this post, 5.1 is not supported via HBO Now either. In fact, 5.1 is currently not playing on anything except Amazon content. Amazon has posted comments to customer reviews on the Amazon product site that a fix is coming via a software patch on October 22nd to address the 5.1 issue with Netflix and Hulu on the second generation Fire TV, and by the end of November for all other Amazon Fire TV units. There was no specific mention of a fix to HBO Now streaming in 5.1, however.
I was going to give Roku a shot, since we have a Roku 3, and know Netflix and Amazon stream in 5.1 on the Roku 3. Unfortunately we have not been able to get HBO Now activated on our Roku 3, an issue we are currently working with Roku support on, so we have no way to test. (For the record, HBO Now does not support payments via PayPal through Roku's site, so we had to switch to a credit card. For whatever reason, even though Roku can authenticate our credit card, the HBO Now service via Roku 3 will not validate our credit card, and fails to let us register on the Roku).
I am glad someone else posted and confirmed HBO Now is currently not streaming in 5.1 on the Roku 3. Saves me the trouble of wasting a free month of HBO to test (if I can ever get HBO Now to register on our Roku 3).
Thank you again for the information.