NPR Labs recently completed a year-long technical study of Internet audio streaming. The study, funded by NPR Digital Media, provides a comprehensive evaluation of candidates for digital audio compression (codecs) used in streaming public radio station programming over the Internet. An objective of this study was to identify the best digital audio codec and streaming rate for delivery over mobile wireless networks, to smartphone and tablet devices using a custom player application, and to players that are embedded in web pages. The study evaluated how audio loudness shifts may annoy consumers and developed a solution to loudness management across various NPR and member station streams and programs. Although it is a research report - not a 'how-to' guide - the report discusses implementation of all the recommendations. Click on the link below to download the report.