Hi-Fi 2 Expansion Amplifier Assembly with Power Supply Expands the Hi-Fi 2 Eight Source, Eight Zone Distributed Audio System to a total of 16 zones. Includes expansion PCA with power supply and power cord. Expansion Amplifier must be mounted no more than six inches (15.24cm) below the Main Amplifier. If connecting to a Leviton Lumina or Omni automation system, utilize the OmniPro II or the Lumina Pro in order to enjoy all zones.