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...

I used hot melt glue. You can probably do better. I needed something quick and easy without drilling into the board. You can see the glue on the standoff on the board.

Check the part number on the stock regulator, if it is a NatSemi pinout,use SPX17 5V (https://www.belleson.com/store/SPX-Max-Performance/SPX17-Positive-Output) if it is a Motorola pinout,use SPX78 5V (https://www.belleson.com/store/SPX-Max-Performance/SPX78-Positive-Output) Take a photo of the...

@fmzip. Check polarity of the caps on the XO regulators, the look like they are reversed. White bar is normally +ve Your board My board

Check the polarity of your caps, white bar is usually +ve Your board My board Further details in PM

HQPlayer 5 uses the AVX-512 vector floating point instructions, Intel removed this from retail processors like the 14900 series. AMD added AVX-512 support in Zen4 and is one of the reasons I chose AMD. I bought the 7950X3D Uplift in performance is about 20% AVX-512 on Intel is reserved for the...

USB needs to be plugged and the audio connection setup. All 3 front panel LEDs on. Otherwise the USB core goes into low power state. Measure when there is music going thru the SU2 I would change the caps on the usb side, but if you are unsure skip it. PS: 0.1mA does not sound right, it should...

Singxer already has bypass caps on the board, the 1 cap is sufficient to keep local noise down. The ideal is to keep either on the adaptor or the motherboard, not both, you risk creating a local ground loop. SU-2 is quite fussy, I have already run into issues where some crystals don't work...

Measure across the caps directly. The yellow caps is on the "dirty" side of the DDC. They have 3.3V across them. The 3.3V legend is the positive side, double check this is the case for your board. There are 3 caps that can be replaced as shown. The pads are large enough to support a larger value...

Nope. Take a closer look at the proposed placement, other two yellow outlines as drawn, bypasses nothing.

Use a 100nF smd ceramic in topmost position. You do not need to place anything in the area with the red X. The other side is for mounting the crystal. Triangle is pin1