Yes, non Audio GD connections require compatible pin layouts.

If you are connecting two pieces of Audio GD gears, yes, you may use an HDMI cable. For example, from a DDC such as Di20 or Di24 to R8 or R28

I can comment on some of the equipments: I own R28 (1st Gen), Di20He, R8He and HE9 R28 + Di20He is a sizable jump from R28. This is going from good to better. R28 + Di20He to Di20He+R8He is a big jump. This is going from better to best. The above are connected to a speaker system. My...

My impression of the changes is likely limited by my systems' bottlenecks and may not be yours. However, for a general change, you may want to read the topic on Di20 and get a general idea of how others who has the unit expressed their opinions and their comparisons to other DDCs...

Try a DDC, such as Di24He or Di20He (used) which connects between your source and the R28. One of the best connection methods between the above mentioned DDC & AudioGD DAC is using a short IIS (hdmi) cable.

Yes, but only active speakers. Most speakers, non-active type, would required a power source such as amplifier.

http://www.audio-gd.com/R2R/R121/R121EN_Use.htm I am sure you have referred to the above

There are the following options if you want to go SBC direction: C19 digital transport or just a plain raspberry pi with a good power supply. USB signature is a raspberry pi 3 with parts replaced to get better sound quality. C19 is a similar product verified by fellow user to be better...

Not sure about that one, but this one works well https://allo.com/sparky-eu/usbridge-signature-pcb.html It would be even better if you have a clean power supply for it

To quote from Kingwa(the chief designer of AudioGD): They are not which is better but most different on the flavor and worth to own both just like you own some different headphones. NFB-28 sound detail, dynamic, control but not bright and hash. R28 had the exotic sound quality! Smooth...

See post 398 on DI24, as below: Device Manager>Universal Serial Bus controllers>"pick the USB device and right click">uninstall driver repeat above with the last command with update driver>browse my computer for drivers

If your Altera Blaster is detected, you should be able to start the installation process running the Quartus. Try to delete the device driver that windows (default) uses and direct it to use the driver in the Quartus directory.

Not sure I can describe the difference sufficiently to do it justice, since I listen for the music and never try to distinguish between the sources. In my system, I can listen to the headphone from the preamp (SFL3) and get completely into the music much faster. I think the difference is taking...

TU8900, Lundal transformer, 2A3 or 300B, with Senn800S and Focal Clear using Audio GD dac, good performance. Almost as good as Sonic Frontiers Line 3 but since SFL3 is discontinued, I would say, this is really good, considering the entry point for the kit.

Device Manager>Universal Serial Bus controllers>"pick the USB device and right click">uninstall driver repeat above with the last command with update driver>browse my computer for drivers