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The lower the circuit impedance, the better the signal-to-noise ratio.
Shake your iPhone while simulating the circuit to inject noise, then try finding the noise peak within the oscilloscope if you can.
This DI box circuit can be modified to have two output types: unbalanced, and balanced. If in/out impedance seems to be a problem (usually the input does, newer audio outboard gears are able to handle any types of impedances) then add a transformer right after the input. The calculations for an impedance matching transformer is N=sqrt(Zsource/Zload) <---This is for the Almighty @hurz who can't get his head around my very low noise, low impedance 4 channel audio mixer circuit I previously posted. As he suggested, this isn't personal!
EDIT: My bad, we don't even have to do impedance matching in audio engineering for the big bang's sake, because we're not powering electrical equipments using the power of shredding guitars, screeching vocals or banging drums, we're just replicating mechanical energy into electrical energy and amplifying them for entertainment purposes! @hurz IN YOUR FACE! Why don't YOU build an audio mixer with just a couple of resistors then?
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