I have to say I didn´t find any information on the MKII on their website so did send them an email.
Regarding differences between DA220 and DA220 MKII I got this answer from April Music:
1. Add 1 USB port:
DA220MK2 supports USB (Universal Serial Bus) port for Personal Computer or Notebook connection. We didn't use DAC function in USB DAC chip itself. We specially designed digital to analog conversion circuitries for USB port externally with high-end grade DA Conversion devices.
Even a 1/10 compressed 128k MP3 files can be heard as close as the original WAV files. These files also upsampled upto 192 kHz sampling rate.
2. 6th Order Digital Filter:
Upgraded (Improved Phase Integrity)
Custom designed 6th order digital filter circuitries for sonic quality.
3. Internal Wiring
Replace by quality wires (BELDEN grade)
4. Wider frequency response
Extended the bandwidth as high as possible.
DA220: 10~55kHz/da220mk2: 10~65kHz
5. Music balance
We added 1 stage analog buffer more for music balance
Regarding differences between DA220 and DA220 MKII I got this answer from April Music:
1. Add 1 USB port:
DA220MK2 supports USB (Universal Serial Bus) port for Personal Computer or Notebook connection. We didn't use DAC function in USB DAC chip itself. We specially designed digital to analog conversion circuitries for USB port externally with high-end grade DA Conversion devices.
Even a 1/10 compressed 128k MP3 files can be heard as close as the original WAV files. These files also upsampled upto 192 kHz sampling rate.
2. 6th Order Digital Filter:
Upgraded (Improved Phase Integrity)
Custom designed 6th order digital filter circuitries for sonic quality.
3. Internal Wiring
Replace by quality wires (BELDEN grade)
4. Wider frequency response
Extended the bandwidth as high as possible.
DA220: 10~55kHz/da220mk2: 10~65kHz
5. Music balance
We added 1 stage analog buffer more for music balance



















