A few corrections:
The iFi Zen DAC, especially with the $49-$99 low-noise power supply upgrade, is a far superior DAC implementation.
- iFi Zen Blue has only Bluetooth input and is powered by an external 5V power supply. There is no USB or any other physical input, unlike the iFi Zen DAC, which can be powered either by the same USB providing the signal or with a superior low-noise external power supply.
- Bluesound Node 2i has no USB input from a computer; the USB port is for storage drives only.
- the iFi Pro iDSD is a true streamer.
The iFi Zen DAC, especially with the $49-$99 low-noise power supply upgrade, is a far superior DAC implementation.