RF noise reduction mod to the Singxer SU-1. This feeds the I2S input on my 004.
The stock SU-1 was a disappointment given the hype around its performance.
Keeping RF noise in the SU-1 under control is the first step in getting it to exceed the performance of the onboard Amanero/LT3042 combo.
Fair-rite M6 over the reclock logic
3M AB5100 over the USB side.
The absorber materials chosen to match the operating frequency.
On the bottom right of the picture, note that Singxer used a connector with incomplete shielding.
The exposed USB pins will radiate RF noise into the enclosure.
Picture below shows AB5100 material used to stop this.
Kapton gold tape to prevent the absorber from shorting out nearby components.
Another problem with the SU-1 is that the metal shields of the USB and HDMI connectors are joined.
This is very undesirable given the LKS 004's sensitivity to RF noise.
This is a path for unwanted RF noise to get into the LKS 004
Additional piece of AB5100 material to help mitigate this.