I received the following information from Gustard technical support with regard to the J35 jumper on the U16: 1.The J35 will not be eliminated. 2.The electrical function of this J35 jumper : Mainly the frequency of the mclk signal in the iis interface, when the j35 is setting, it is 22/24...

You don't remove the J35 jumper - but reposition it. In my stock configuration, the two-pin J35 jumper was attached to only one pin, thus the associated circuit was open. When you move the J35 jumper, it will short the two pins together and close the circuit. It is akin to the old CMOS clear...

I recently acquired a Gustard U16 to complement my Gustard A20H DAC/headphone amp. I needed to move the J35 jumper within the U16 in order to obtain compatibility for DSD playback over I2S with Gustard's A20H. The need to make this jumper change was relayed by Gustard support and did resolve...