No. You can't improve the quality of a conventional phone call beyond the capability of the network, which is bandwidth limited to 3kHz.

Spencer, I'm just bitter that I spent all this time (my whole life) and money striving for good audio only to discover, based on Blog Talk Radio's success, that audio is not important.

It's more like catching up to 2010. I heard one of their HD streams. It was not impressive. They are quite expensive for what you get.