API 500 Series

These days more often referred to as simply “500 series,” A physical device format created by API that allows various hardware modules to be mounted into a master chassis, which provides the power supply, input and output connections, and in some cases other features such as mixing, sidechains, and more. The 500 series format includes modules such as mic preamps, direct boxes, graphic and parametric equalizers, compressor/limiters, and more, from a wide variety of manufacturers. The 500 series offers advantages such as reduced price, increased portability, standardized design, compact form factor, and more.