Ethan Winer has, at various times, earned a living as a professional musician, computer programmer, circuit designer, recording engineer, composer/arranger, technical writer, acoustician, and college instructor. Ethan has more than 200 feature articles published in various computer and audio magazines, and his Cello Rondo music video has received nearly two million views on YouTube and other websites. He's produced dozens of educational and music videos and composed four pieces for full orchestra, all of which have been performed publicly. Ethan is currently a principal at RealTraps Acoustics, a leading manufacturer of acoustic treatment.

Michael Lawrence is a live sound engineer who specializes in designing and tuning sound systems and has published more than 50 technical articles as well as a full-length book on the topic. He has also published research on sound level measurement and sound exposure at live events, and he serves as technical editor for multiple pro audio publications, including the previous edition of The Audio Expert.