Just received and test it. I connected with SU-9 via XLR(female) to TRS cable and speaker JBL Stage A130, amplifier power more than enough for listen loud 80dBA(measured with UNIT-T UT353 sound level meter) at middle range (3m).
I'm not report subjective review as some may not want to hear it. But I promised to buy the next class AB amp that @JohnYang1997
will release soon. I respected your R&D result.
Anyway, the build of speaker binding post connector very loosen. I need to open cover to fix it from inside. Thank @genfreeciv
for internal picture ,it made easier to find how to open it. It need to be more qc for this price level.