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Yes, DJs do use equalizers. They are an essential tool for adjusting the frequencies in the music they mix to prevent unwanted clashing of sounds and to make the overall sound smoother and better. DJs often adjust the equalizers on their mixers and on their digital audio workstations (DAWs) when producing music. The bass, mid, and treble controls on a typical equalizer help a DJ fine-tune the mix, allowing for the best possible sound during the performance.