A Certain Sound is an introduction to the theology and practice of preaching the gospel in public. The audiobook is concise, gracious, and uncompromising. It is saturated with Scripture, church history, and practical experience. It is a handbook and encouragement for open air preachers. It is an apologetic for frontline evangelism. It is written for both individuals and study groups, pastors and laymen, open air preachers and Christians who evangelize. He who has ears to hear, let him hear this audiobook!

"A Certain Sound is a well-written, carefully crafted, scripturally saturated book that was a joy to read. As one who has many years’ experience with open air preaching, I thank God for this stirring call to the church to fulfill one of her main duties - namely, preaching Jesus ‘to every creature.’ Read this book. Master it. And with the help of the Holy Spirit, let the ‘certain sound’ of the glorious gospel of Christ be heard outdoors once again." (Rob Ventura, Grace Community Baptist Church, North Providence, Rhode Island, and coauthor of A Portrait of Paul and Spiritual Warfare)

"A Certain Sound by Ryan Denton and Scott Smith is a welcome contribution to the contemporary discussion on open air preaching. From a perspective deeply grounded in the Christian tradition and Reformed and Puritan theology, Denton and Smith defend the ministry of street preaching in a firm but moderate tone. Everyone who practices open air preaching or who is interested in its biblical basis must read this book." (Sam Waldron, academic dean and professor of systematic theology at Covenant Baptist Theological Seminary, and a pastor of Grace Reformed Baptist Church in Owensboro, Kentucky)