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Sony NW WM1Z review https://www.head-fi.org/threads/sony-nw-wm1z-wm1a.815841/page-2802#post-15769389
EQ
SonSig NW WM1ZM2 / NW WM1Z / NW WM1A / MDR-Z1R / TA-ZH1ES DAC USB
IEM: ACS T1 3BA / Etymotic 4P Pros: Senn 600 [1997 orig] / Beyer DT990 Pro / Sony MDR 7506 etc etc etc
EQ
SonSig NW WM1ZM2 / NW WM1Z / NW WM1A / MDR-Z1R / TA-ZH1ES DAC USB
IEM: ACS T1 3BA / Etymotic 4P Pros: Senn 600 [1997 orig] / Beyer DT990 Pro / Sony MDR 7506 etc etc etc