The Pioneer DJ 2-channel, 4-deck battle mixer is an upgrade to the DJM-S9 Pioneer DJ has announced its new mixer, the DJM-S11. An upgrade to the DJM-S9, the 2-channel, 4-deck DJM-S11 comes with additions to make it easier for DJs to play with Serato DJ Pro or rekordbox, with no license keys required.   Features include