Upgrade TCXO for ES9028Pro
(NFB-29.28 only) for
slight improve on the sound transparency
Cost is USD20, without shipping
Custom order two pair RCA outputs replace
USD5 without shipping delay .
3, Custom order HDMI replace RJ45 I2S
Price is USD20, without shipping delay.
4, Custom order Two 6.3MM headphone
+USD10, without shipping delay.
5, Upgrade USB isolator price is USD32.
USB isolator can avoid the computer electric interrupt feed in the
DAC cause the sound quality worse . In AB compare , it can
improve on sound transparency slightly .
After USB isolator upgrade, the USB spend the USB power supply, and
can not support phones because the power limit of the phones .