All three mixers have digital analog converters that bring all music sources up to 24 bits. All three mixers have illuminated control buttons that make it easy for you to adjust in the dark. All three mixers are capable of outputting to XLR (balanced) or RCA (master, record line). The DMX-B1, DMX-S1 and DMX-BP3 all have an iPod/MP3 input. The DMX-BP3 is a step up from the lower cost DMX-B1 and DMX-S1 in that it has dual USB inputs, which allow you to easily access your laptop playlists.