A good review of Cayin HA-1A in the magazine
If you can read traditional Chinese, here is a good review of Cayin HA-1A from a
Taiwanese audio magazine
If there are enough people interested in it, I might translate a few key paragraphs. The reviewer commented that the measurement graph shows a significant amount of AC hum, and commented that he could hear the hum using headphones.
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Source: Sony DVP-NS900V, Benchmark DAC1, PreSonus Central Station, M-audio Transit
Headphones: K1000, K501, SR225, HD595
Head Amps: Cayin HA-1A, DAC1, Central Station
Speakers: Athena S2+P2, Athena S5, Jolida JD301
Speaker Amps: Sophia Baby Clone with EL84, Jolida JD301A, Sonic Imapct T-amp
Work Rig: Tivoli Model 2 Radio->KSC-75, Laptop->PX100
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