Russound PR-4Z A/V Controller/Preamplifier with Telephony & Paging Overview Russound's PR-4Z is a state of the art multi-function, multi-source and multi-zone controller/preamplifier Internally complex, yet externally simple and easy to operate, the PR-4Z is a design and engineering marvel and Russound's engineers are justifiably proud of their flagship model. The PR-4Z acts as "the brains" of a high quality audio/video system. Much like a human brain, this sophisticated component is capable of multi-tasking, as it can handle three audio and three audio/video sources to any of four rooms (zones) simultaneously. It can also provide whole-house paging via optional keypad paging modules. Simple to use, stylish keypads are an integral part of the system. The ergonomic keypads allow the user to simply control audio or audio/video independently to each zone (room) of your home or office. The PR-4Z provides a very smart complement to your audio/video entertainment system.