The ESPLink input card for PowerMatch® configurable professional power amplifiers installs into the digital expansion slot to receive 8 digital audio channels from an optical ESPLink connection. Each card includes a passthrough connection for linking multiple PowerMatch amplifiers. The PowerMatch ESPLink card enables PowerMatch amplifiers to receive 8 channels of digital audio sourced from a ControlSpace® ESP engineered sound processor or through an upstream PowerMatch amplifier's ESPLink card. This card allows for simplified audio distribution when devices are co-located in the same equipment rack.