As suggested already, get the following:
I2SoverUSB v.III (it already has a very low SDA phase noise crystal oscillators)
I2SoverUSB - I2S over USB Audio
AK4490 board
AK4490 - I2S over USB Audio
LME49710 filter board
LME49710 filter board - I2S over USB Audio
The voltage regulators:
for all negative rails:
TPS7A3301 Ultra Low Noise LDO Voltage Regulator
TPS7A3301 Ultra Low Noise LDO Voltage Regulator
for all positive rails:
LT3045-A Ultra Low Noise LDO Voltage Regulator
LT3045-A Ultra Low Noise LDO Voltage</br>Regulator
The above, if wired nicely, can sound very good.
