The Formula Sound FF-4000R is a high-end rotary mixer for DJs, developed in cooperation with Funktion One. The result is a DJ mixer with the highest sound quality and the layout and features professional DJs need. 30 years of experience in the pro-audio industry guarantee highest performance audio quality, manufacturing quality and reliability. The Formula Sound console has 4 channels with 2 inputs each, a total of 8 inputs with different connection options. The FF-4000R is capable of handling the most demanding situations.