The ChainDrive is a 500 series module that packs a 1 x 4 distribution amplifier in a single wide module. DA’s (distribution amplifiers) are used in all types of audio applications such as splitting a signal and sending it to various processors in the studio, to various amplifiers in a PA system or sometimes to different rooms in a venue. You connect to the ChainDrive using the XLR input on the 500 series power rack then use the four front panel outputs and level controls as needed. The ChainDrive is unique in that it can distribute both balanced and unbalanced signals or be used to distribute stereo signals. For those equipped with a Workhorse, you can use two or more for 1 x 8 or larger DA setups.