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Posts by Mr Vicarious

Very interesting discussion. Surprised that there isn't more known officially about the effect of output impedance on planar/orthodynamic headphones.   From a purely subjective point of view, I have a Asus Xonar STU amp which has an output impedance of 10 ohms and a Hifiman 400s which has an impedance of 22 ohms. On paper (according to experience with dynamic headphones) this combination should sound awful! But the sound I'm getting is very good indeed - very well...
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That's one serious looking op-amp! How much was it and is it readily available?
Much better.
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Yes, I definitely recommend the HA INFO. The op amps can be purchased from eBay.If you buy it, give it at least 60 hours burn-in to reach it's full potential.
Can you tell me what mods exactly your friend did to the unit? I would be really interested to know.
        HA-INFO U2 Plus     Great little USB DAC, with impressive specs for the price which is £45 ($70):   AD1852 DAC Tenor USB TE7022 ALPS Pot TI 6120A2 headphone amp Good quality caps    After replacing the stock op-amp with a OPA2134 and using Sennheiser HD600 headphones (300 ohm) the sound is smooth and dynamic but controlled and with good detail. There's also enough power to drive the Sennheisers to fairly high volume levels.   Despite their high...
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