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jruser
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Sep 19, 2016
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Remember, the O2 can only output 7V on AC power before clipping sets in. The 6.5x gain setting is only useful if your source is 1.08v or less. Most people using a DAC will want the 1x/3.3x version for that reason. If you are using something like an iPhone with a 1v output, then you should consider the 6.5x option. Even then, not many headphones can work at listening volume at 5+ volts.
Sep 19, 2016
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