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# [Official] OCN Headphones and Earphones Club - Page 1094

Quote:
Originally Posted by chinesekiwiÂ

it will have lower output impedance than the Fiio E9 at 10 ohm output impedance

the output impedance of an amp is not the same as the headphone impedance

The FR curve you're showing is not because the tested load is 13 ohms but because it's 9 ohms at some frequencies, 70 at others, 90 at others, 20 at others, and so on: so it's variable.

You won't get frequency response variation from a source with high output impedance into a load with constant impedance over frequency, just the worse damping ratio. That's why I showed the graph of the AH-D2000 impedance over frequency.

It's pretty clear that you get a very simple voltage divider circuit between the load impedance and the source output impedance. V_L = V_s * Z_L / (Z_L + Z_s). Voltage across the load, at any frequency, will be the source voltage multiplied by the ratio of the impedance of the load at that frequency to the sum of the impedances of the load and source. If Z_s is constant over frequency (generally it is), then Z_L varying over frequency means you get varying V_L over frequency. Hence wonky graphs like you linked. If Z_L is constant over frequency, that means that you lose voltage to the source output impedance, but it's an equal amount at different frequencies, so there's no relative shift in treble or other frequencies.
Edited by mikeaj - 12/27/11 at 1:40pm

### Gear mentioned in this thread:

for that to be confirmed however, you would need a impedance over frequency graph of the Super.fi 5 Pro
Quote:
Originally Posted by chinesekiwiÂ

for that to be confirmed however, you would need a impedance over frequency graph of the Super.fi 5 Pro

For what to be confirmed? Kirchhoff's voltage law?

The Super.fi 5 Pro impedance over frequency graph is on the same page you linked:

I didn't read the whole page earlier and see this before (though I'm a fan of nwavguy's gear reviews), but you can see similar calculations if scroll down to the "the math" subsection on that page.
So I have an e10 in, and it sounds surprisingly good. Great, actually! I'm now wondering what my DAC should be: e7 or e10? I'm also pondering whether the e9 is necessary right now as my headphones aren't that hard to drive yet. The idea of "future-proofing" if I ever do get high impedance headphones is comforting, but I'm wondering if it's needed.

-Derps- can't make up my mind.

And man, the e10 is seriously tiny.
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This thing is tiny!
Quote:
Originally Posted by mikeajÂ

For what to be confirmed? Kirchhoff's voltage law?
The Super.fi 5 Pro impedance over frequency graph is on the same page you linked:

I didn't read the whole page earlier and see this before (though I'm a fan of nwavguy's gear reviews), but you can see similar calculations if scroll down to the "the math" subsection on that page.

No, it's confirmed then (to me). Learning all the time here. So much stuff to learn in audio, from the electrical engineering side, to psychoacoustics to the computer science side...
can i add ive now got some AKG 240 mk2 and a set of senny HD428s which sound amazing for the money!
Edited by Big-Pete - 12/29/11 at 10:21am

Titanium hd soundcards DAC - Fiio E9 amp - AKG Q701 headphones

increadible for gaming (soundstage is out of this world). Unlike k701 the q701 has accurate soundstage.
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