Daniel,
Well, there is DirectTV as part of the system, but there is also a PS3, Sony DVD/SACD player and Squeezebox going digitally into a Marantz SR5004 receiver. Music is played more than the TV is on, and the Squeezebox is the main source. I play Pandora once in a while, and we stream Classic FM (London) quite a bit. As with most speakers and systems, the better the source, the better the sound. The Grandeurs will make the streamed content sound as good as it can, but when you play uncompressed files, you can definitely hear the improvement.
Chuck