KPO Pointers - Professional DJ mixers come in all price ranges and with different feature sets. Most professional DJ turntables can be identified by balanced outputs (either XLR or TRS). Before deciding on a DJ mixer it is important to know exactly what your needs will be moving forward. If for example you will eventually be doing Karaoke you may consider having more than one mic input important. Club DJs may want to consider built in effects. Scratch DJs usually want 10 inch mixers to get the turntables close together and most mobile systems are rack mountable so 19 inch rack mountable mixers are needed.