Whirlwind AES-SP1X2 AES 1x2 Passive SplitterWhirlwind AES SP1X2 AES 1x2 Passive Splitter The Whirlwind AES Splitter 1x2 is a passive unit that delivers two identical AES EBU signals from a single stream. The design utilizes a dual secondary transformer on the input and a separate isolation transformer for each output. With the three transformer circuit, the Whirlwind AES SP1X2 maintains excellent data integrity and high amounts of isolation between outputs.