Wisdom in mind,   enthusiasm at heart.

NFB-11(2015 )(Since 1th Feb 2015)

Discrete  DAC+ Headphone amplifier / Preamplifier
DSD , DXD support from USB
32bit / 384K Sabre ES9018
32bit / 384K Asynchronous Transfer  USB-32 Chip

1, Replace the RCA coaxial input by BNC socket:
     Cost is USD10  without shipping delay .
       

2, Upgrade TCXO for USB chip and ES9018.
     There are two TCXO can for upgrade,  Cost is USD20 / per without shipping delay .This upgrade only can slightly improve on the sound transparency .