随手看到的，所以想请TOPPING技术人员解释下。 https://www.head-fi.org/threads/topping-l30-the-new-budget-benchmark.934262/ ASR "established experts" didn't pickup design fault in Topping A90. Also ASR measurements didn't show ground loops introduced by such a fault. It is despite of the fact that ground loops are typically a plaque of Amir's equipment (only when testing non-Topping products like TotalDAC). I bought Topping D30 (featuring the best measurements on ASR) and it produce trash, not a sound. From my experience ASR measurements are cannot be trusted. Having said the above, L30 doesn't look bad and is worth trying. It doesn't have dual MeanWell SMPS outputs hoocked in series (so is free of A90 fault) and it doesn't cost $500. .LOL.