so over at ASR, people have commented today that topping said that they used a step down transformer on the output of the step up transformer, an no capacitive load.
flat out fraud this is... and completely meaningless published specs.
if someone paid attention during the design process and actually used a real 120pf load, or even headphones, they would know how fucked up this is.
the topping a90d may be decent. but my testing in the past indicates that stuff with huge amounts of open loop gain, and then huge amounts of feedback to get those magic distortion numbers usually sound like crap.
this thing, and their power amp all use one switching power brick to make the positive voltage and then another switcher internally to make the negative voltage. so a switcher driving a switcher. not a great idea.