SMSL M8 DAC

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I attach some close up photo of the board for further analysis.
 

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This is a photo of the analog section. It appears to me that the opamps are bypassed using a combination of two types of smd capacitors. The lighter color caps look like C0G which is good. I guess the other caps in parallel (more brownish) may be x7r or x5r. From my experience, combining different types of capacitors in one position may cause anomalies in frequency response. Do you think it's worth to replace the lesser quality caps with C0G?
 

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I modded my m8 by way of the caps in the opamp power rails and lower esr on the main caps. Improved the bass, soundstage, and slight bump in the hf, not that it needed it there. This simple mod puts this DAC in out performing DACS over a 1000+

the stack of capacitors you have in the photo appears to be in the feedback loop of the opamp in series with a resistor. it's not the position of the power rail bypass cap.

If you change the value of this cap the cut-off frequency would change. higher value cap would roll off treble to some extent.
 
This is a photo of the analog section. It appears to me that the opamps are bypassed using a combination of two types of smd capacitors. The lighter color caps look like C0G which is good. I guess the other caps in parallel (more brownish) may be x7r or x5r. From my experience, combining different types of capacitors in one position may cause anomalies in frequency response. Do you think it's worth to replace the lesser quality caps with C0G?

The two resistors with codes 6341 and 1002 look very strange. They seems to be of lower quality than other resistors in the analog section which are MELF resistors!
 
No, it "remembers" its on/off state when you shut it down.
I power it with a remote controlled power socket togheter with the amp (one DAC and amp per speaker) and everything works fine. No turn on/off noise, no surprise, it is a very well behaved unit.
The only grip I have with it is that you cannot turn the OLED screen off, and it is said to age pretty badly. Not an issue in your case (pun intended) I suppose 🙂
 
Guys,

I hope someone on here can help with an issue I have with the SMSL M8.
I accidentally (stupidly) used the tool to update its firmware and used an old firmware version, the process didn't complain and updated the firmware.
Since then the XMOS part is not operational. The device is not seen on the USB bus. The SPDIF/TOSLINK part is working.
Is there a way to reset the XMOS chip?

Thank in advance to anyone that can help.
 
Guys,

I hope someone on here can help with an issue I have with the SMSL M8.
I accidentally (stupidly) used the tool to update its firmware and used an old firmware version, the process didn't complain and updated the firmware.
Since then the XMOS part is not operational. The device is not seen on the USB bus. The SPDIF/TOSLINK part is working.
Is there a way to reset the XMOS chip?

Thank in advance to anyone that can help.

Hi, were you able to solve the problem XMOS / usb not working?
 
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