Wisdom in mind,   enthusiasm at heart.

NFB-28 (ES9028Pro )

Discrete  DAC+ Headphone amplifier / Preamplifier
With XLR / RCA analog inputs
DSD , DXD support from USB & I2S Input
32bit / 768K Sabre ES9028Pro
32bit / 384K Asynchronous Transfer XMOS U208 Chip

1,  Upgrade to the Amanero combo384 USB module:
     Upgrade to the Amanero combo384 USB module for replace the Xmos U8, price +USD45.

2, Upgrade TCXO for ES9018 for slight improve on the sound transparency .
     Cost is USD20/per,  without shipping delay .

3, Custom order two pair RCA outputs replace ACSS outputs:
       USD5 without shipping delay   .

4, Custom order HDMI replace RJ45 I2S input.
     Price is USD20, without shipping delay.

5, Custom order HDMI replace USB input.
     Free with 1 days  shipping delay.