It must be your source which has got a low volume. I tried Zero DAC -> Headfive -> HD650 and at 2 a clock, it measured 100 dB (with a db meter). Thats 2 a clock only. This is much much much higher than safe.
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H X-fi XtremeMusic -> ASIO -> Optical -> Zero dac (OPA627) -> Zero internal amp (LT1469) / LD MKIII -> ATH-AD2000 / RS1 / DT880 2005 250ohm / HD600 '02
P Cowon D2 - Koss KSC75
Other Fiio portable amp / Playstation SCHP-1002
Gone: DT990 2005 32ohm, HD650 with Oehlbach cable / Meier Corda Headfive / MS2i
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TEAM AUDIO-TECHNICA ATH-AD2000
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