The new Clarion CMS4 and M606 provide the benchmark for multiple zone support. The M606 marine radio delivers four independent audio zones, each with its own volume, equalizer, balance and HPF controls. The M606 features a single source audio selection that can be distributed in up to four zones allowing for discreet audio controls and configuration. For a vessel that requires independent sources in addition to the standard audio controls, you can step up to the CMS4 Marine Black-box which features an industry-first four independent audio zones with four simultaneously configurable sources. The M606 features a single remote input that can be split multiple times, allowing for all four zones to be controlled from different sections of the boat. The CMS4 has four remote inputs, granting zone control for each of the four available zones.