Previously used the Shanling PH300(0) with my Grado GS1000, which was not a good match. The Grado sounded way too harsh and tiring, already after slightly turning the volume up. As a result, I purchased the Yulong A100, which was basically another wild guess, despite the positive review on HF. I am very happy with the sound the GS1000 produces when powered by the Yulong A100, which is tight, airy, punchy bass, detailed and musical. Altogether I can really recommend the Yulong A100.   A few comments to the designer, which could be considered...