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Sep 19, 2016
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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