Atlantic Coast Communications is a turnkey audio/video program producer, and their ACC Radio library contains audio from some excellent teachers, broken down according to speaker and biblical book. Some of the speakers include Mark Dever, Donald Barnhouse, James Boice, Bryan Chapell, Tullian Tchividjian and many more. An excellent resource.
Former pastor of Philadelphia’s historic Tenth Presbyterian Church, Dr. Barnhouse was an immensly popular preacher in the first half of the 20th century. He was one of the first to start a radio ministry which he called ‘The Bible Study Hour.’ He also founded and edited ‘Eternity Magazine.’ At his death his pulpit was filled by the great James Montgomery Boice, and now is held by Phil Ryken, Jr.
You can also find links to audio resouces at the Alliance of Confessing Evangelicals.