iFi Zen One Signature Dac and Bluetooth ReceiverZEN One Signature Our ZEN One Signature takes the DAC stage from the ZEN DAC V2, adds S PDIF inputs (optical and coaxial) alongside the USB port, stirs in Bluetooth technology from the ZEN Blue V2 and seasons the pot with Signature grade circuit enhancements to create a delicious audio brew. The result? The ZEN One Signature is a pure DAC (no built in headphone amp and volume control) that serves as a home audio hub for all your digital devices, from