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# Low current to drive high impedance cans? - Page 2

Is max output the same as output impedance? The WA7 spec sheet doesn't list an output impedance, rather a max output: 1 watt @ 32ohms.

No, it's something completely different. Max output tells you how much power the amp can output into a given headphone load.

Without more details the number could be peak or RMS output power, it could be at 1% or 5% or 10% THD (total harmonic distortion) ...

Using P = V*V/R you can still calculate the voltage across the load. V = sqrt(P*R) = 5.57 V.

Without another data point we cannot tell what the output impedance is.

Imagine an amp with 32 ohms output impedance. With a 32 ohm headphone half the voltage drops across the internal resistance. With a 600 ohm headphone only a tiny fraction of the voltage drops across the internal resistance. If you know  the output voltage (across the load) for both you can calculate the output impedance.

Edited by xnor - 4/25/13 at 1:30pm
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• Low current to drive high impedance cans?