josby
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The testing I did found, like you did, that there was no difference above 200Hz at different volume levels. But I did find that there is actually a gain in volume below 100Hz relative to the rest of the music as you turn the volume down. Nothing happens as you go down from volume 40 to 29, but below 29 there starts to be a difference, and below 20 the differences get bigger.
It does not matter what frequency you are considering, the Output vs Volume control level follows the same curve.