The BOSE's CONTROLSPACE ESP4120 designed sound processor is an open-architecture DSP with 4x12 fixed analogue audio, built-in 8-channel ESPLink output, and a rear-panel digital expansion slot that supports IP-based network audio and control. This signal processor satisfies today's stringent standards for high-quality signal processing and control in a budget-friendly compact. The ESP-4120 is suitable for a wide range of applications, from tiny stand-alone projects to big networked systems.