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Does anyone understand the max power output level? I was always under the impression that at lower ohms it should output more power? For some reason it looks like it’s all over the place?
It depends on what your limiting factor is and how you define "power." If you are thinking of power as "more watts equals more powerful" then at lower ohms the limiting factor is how much current a unit can supply at a given voltage. This is all a gross oversimplification, but more current is required at lower ohms, so "power" is decreased if the unit can't handle that much current at its max voltage. A highly resistive load (600 ohms, etc.) suffers from different limiting factors.
To add on to that explanation above, look at the voltage levels at each given impedance. They are linear, it's the wattage that's not linear. The circuit design allows for relatively high voltage into high impedance headphones which allows it to have high wattage at those impedances too. The way that design works creates like a hill for the wattage levels. So peak wattage is around 50-100 ohms, but the voltage level is linear and matches the needs of each impedance. So plug in some e-mu teaks with a 25 ohm impedance and they get fed a moderate voltage with a good amount of wattage. Headphones with 50-100 ohms like planars tend to be want high wattage but don't need much voltage so the amp is designed to achieve this. And high impedance headphones 300-600 ohm want high voltage but don't need too much wattage. Basically the designer of the amp developed a circuit that is catered to give the best voltage and wattage for the widest variety of headphone impedances and styles.