beemerphile
100+ Head-Fier
You are in the right direction. One thing is watts and another is amperes (current). You can have high watts output with low current and the amplifier is going to struggle with difficult loads.
Neither you nor the amplifier have independent control over the relationship between amps (current) and watts (power). They are related by a formula. Assuming for simplicity that your headphones represent a constant resistive load (which the Susvara largely does), then the missing link is the voltage provided by the amp. Given the nominal 60 ohm impedance of the Susvara, to put 5 watts through the phone would require 0.29 amps. To deliver .29 amps to a 60 ohm load the amplifier would have to develop 17.2 volts. For any other power level you want to consider, there is only a single voltage and current combination that would supply the power, given the 60 ohm load that is not yours to control. The only thing that puts current through a load is voltage. Power is voltage times current.
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