An Introduction to Digital Audio in the Install World with Peter Moses

JBL is owned by Harman International, a subsidiary of Samsung Electronics and is a provider of home/audio products including speakers, headphones, and other audio related gear. 

Their website has a library of learning tools and they offer several online
webinars and certifications right from their website.

If you are new to the world of audio we suggest you watch this introduction to digital audio, although it's not a complete guide, it provides basic information about topics such as: "What is Audio?", "What is network", audio file sizes, network switchers, audio mixers, and a demonstrated network AV system and it's requirements. The webinar's description is as follows:
"From converting audio into digital and then transporting the packets, learn about the different file formats, protocols and system designs to ensure your audio is delivered perfectly to its destination every time."