HD streaming

I haven't been using your application for long but I've noticed that most streams are only 67kbps. Normally the quality of music is just fine for the average headset or stereo. Unfortunately you definitely can tell the difference with high end headphones or stereo systems. I'm not sure if you can control the quality to your app or if its dictated from the radio stations. Either way could there be an option to sort stations by streaming quality?