Gustard X20?......what is this? Please check out this thread: http://www.whatsbestforum.com/showthread.php?19433-Chinese-DAC-shames-a-few-heavy-hitters
If you read the whole thread there is a second person who also likes this DAC better than Yggy and Vega. And this thing is stock and costs $870 delivered to your door in less than 10 days! This thing is really well made and has two 8 channel ESS DACs (8 DACs in parallel for each channel). Yes, I have one here and will be working up serious mods to it. The output stage has two op amps and a discrete buffer.....my output stage will be either one Jfet with no feedback or a single killer discrete circuit for I-V conversion for those that need more than one volt.
Seems the hot thing is to upsample PCM to double or quad speed dsd using HQplayer (better than jriver, etc....according to some) and then run it into a DAC. Some say this is the best PCM sound ever. The Gustard could be run this way. Check this thread out about doing this using the Nadac: http://www.whatsbestforum.com/showthread.php?16542-On-the-12th-Day-of-Christmas-my-true-love-gave-to...
Can the modded Gustard X20 be as good as $10,000+ DACs? We shall soon see.