Here is the next entry in my series of audio engineering posts. I hope you can enjoy this post and grow with me as I try to get my technician skills back up, and test my music knowledge along the way. DJ Mixer A DJ Mixer is a piece of audio equipment used by DJ‘s to mix together two or more music sources. The modern DJ mixer was revolutionize, by DJ Grandmaster Flash. He invented the crossfader, which is the most essential element of a DJ mixer. __ Mike’s Thoughts – Crossfader DJ and Audio Engineering