The Bose® ControlSpace® ESP-4120 engineered sound processor is an open-architecture DSP with 4x12 fixed analog audio, built-in 8-channel ESPLink output and a rearpanel digital expansion slot offering IP-based network audio and control card options. This model meets today’s strict requirements for high-quality signal processing and control in a cost-effective package. The ESP-4120 is designed for a wide variety of applications ranging from small self-contained projects to larger networked applications.