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I am just trying to figure out the gain.
My 2.1 volt source will need 3.3x gain to get to the 7 volt maximum so I think that would be good.
I'm using this with a 2 V source, and I have the medium gain version. Works great, and I can engage the gain switch when needed, without worrying about clipping. Same will be true for your 2.1 V source.
I haven't even needed to use the gain switch with any of my headphones (I don't have any that are especially thirsty) and there's plenty of juice for them all at low gain and without needing to crank the volume past 12 o'clock.