Quote:
Originally Posted by

**Uncle Erik** Impedance keeps coming up, and we really need a Wiki on it, but high impedance does not mean difficult to drive. It doesn't really mean anything until you know the output impedance of the amp. The closer the impedance match, the better the power transfers from the amp to the headphones.

Think about it as connecting two water piper together. If the pipes are the same size, you're not going to lose any pressure connecting them. If the pipes are different sizes, the pressure could get higher or lower depending on which is bigger or smaller. Impedance is like the diameter of the pipes. That tells you how well they connect, but it does not tell you how much water is going through the pipe or how much water is needed at the other end. How much water goes through the pipe is like the output power of the amp. How much water is needed at the other end is like the sensitivity of the headphones.

So even if you have a perfect impedance match, if your amp only puts out 500mW, it's not going to be able to power something really inefficient like a pair of Magnepans. But 500mW would make a reasonable amount of sound with something very efficient, like a pair of Lowthers.

That is a really good analogy, thanks Uncle Erik :D. Sad part, while I understand the analogy, figuring out how the technical details of the amp itself and and the headphones all come together might be a separate issue. And I doubt using simple physics will help me try to understand but, I’ll attempt it even though I know there are much more variables to calculate for.

So trying to put this into perspective. If the HD600 has an impedance of 300 ohms with a sensitivity of 97db/ 1mW. And, the Corda Swing max volts (11V) and amps (0.025A), the total power is 2.75 watts and the impedance is 44 ohms? So, the corda can’t drive the HD600? Gain switch is a whole new ball game for me.

Edit: Well, that information is completely wrong, I just looked at the manual, the input impedance is 11kOhms (headphone?), and the output impedance is <1ohm (what the Swing can produce?).

Edited by mythless - 7/20/10 at 12:52pm