Sennheiser NT 1-1-US power supply for ASA1 active splitter A power supply for ASA 1 active wireless antenna splitters The Sennheiser NT 1-1-US Power Supply is made specifically for Sennheiser's ASA 1 active wireless antenna splitters The Sennheiser NT 1-1-US Power Supply is made specifically for Sennheiser's ASA 1 active wireless antenna splitters