The O2 will drive all headphones you throw at it with standard gain settings, For high sensitivity in ear monitors (IEM's) and easily driven headphones it is recomended to use unity gain to be able to use more range on your volume control. For headphones that are really inefficient or hard to drive gain can be raised accordingly.
The standard settings should cover 95% of on the market available headphones. Gain settings can be amended to 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8.5x, 10x and 12x. Please choose Non Standard from the Gain Options and specify your desired gain settings in the comments field underneath it.
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