SU-2 and SU-6 have different board layouts, you will have to experiment to see what works on the SU-6 Check you have the right orientation on the SU-6 board as the tantalums are polarized. I would like to see Singxer update SU-6 to the sampling capabilities of the current DACS namely PCM...

There are several filters on the 9038Pro. - The oversampling filter can be bypassed by running at the highest sampling frequency (768k or DSD512), I use the IIR50K with DSD512 input - The final filter before the multi element converter cannot be bypassed.

I used IXYS DSS10 TO-220

I used the stock unit,

LKS I/V is 2 discrete opamps with a pair of output transistors on each opamp, a third opamp is used to convert balanced output to drive the single ended rca output. The first attempt should be made on the 3rd opamp, if you can stabilize that opamp with the new transistors, then you can move on...

This is not like any mod I described previously, it is more of an experiment. With the faster i/v transistors, the DAC will not be operational until the feedback caps are adjusted. This is not a 1:1 substitute that can be dropped in-place of the stock devices. LKS changed the feedback...

The last upgrade I did to the 004 was to widen the bandwidth of the I/V. DSD512 maxes out at just under 25MHz. The I/V output transistors on my DAC have a transition frequency (fT) of 50MHz, I replaced them with 150MHz devices. The higher speed also meant a lot of work to stabilize the DAC, the...

Intona makes them, with galvanic isolation, minus non usb outputs. The 7055-C even has an "ultralow noise" output https://intona.eu/en/products/buy/7055/7055-c

Check if your Mac has Optical SPDIF output, Mac optical output quality is usually good. Direct USB connection from computer to DAC is an option, Macs use USB UAC2 protocol for audio which lets the DAC control the flow of data from the host. This is an advantage over SPDIF. Downside of USB is...

https://www.mouser.com/ProductDetail/Vishay-Precision-Group-Foil-Resistors/Y16285R00000D0W?qs=PQqCikkAB6UJ3wDE6ApbTQ%3D%3D The price doubled in the last 18months, consider upgrading the XO if you have not done so, a pair of the resistors costs more than the Crystek CCHD950X XO

SU6 uses EDLC super caps which makes it somewhat prone to vibration, the insulator between the electrodes is a semi liquid.

Was the resample setting the same before the update?. 176k setting may sound better or have it disabled entirely.

Replied to your private message.

Latest 5.3.2 version of the desktop app is better behaved when it comes to sharing the same audio output device with Roon. On my own setup getting Roon and HQplayer to share the same output device has been an uneasy existence. Using separate output devices on the DAC for example USB for...

You can use the SR805s if they fit on the board. The ones I used were leftover from another mod, ultra low leakage. Regular Schottky's can be quite leaky as temperature increases and this lets thru noise from the other side. Check the datasheet for the SR805 and compare it to the one I used. I...