Thanks a lot for your reply.I'm listening to loudspeakers 90% of the time.
The DI-20HE is a pure DDC and offers more options, while the strength of the Red is its polyvalence as a device.
As pure DDCs, the quality of these devices is similar but not identical.
The USB input of the Red has a slightly better galvanic isolation than the one of the DI-20HE. If your source is not clean, you may get better results with the Red.
With a clean source, the way I'm using it, the sound with the DI-20HE is more refined with an additional layer of sonic textures.
as "not clean source" you mean a PC or Laptop and as "Clean source" a streamer as example?
In other comparation looks like the Audio GD DI-20HE have more deep bass and articulation, you agree?
And what's about stereo image tridimensionality (more deep and wide)? Also here the Audio GD is better?