3 ms·
I'm very skeptic of that 1/8th rule. Usually output impedance should be as low as possible, so that the resistance added by the cable becomes negligible in comp
by squarefoot 3y ago
I'm very skeptic of that 1/8th rule. Usually output impedance should be as low as possible, so that the resistance added by the cable becomes negligible in comparison, and its intrinsic capacitance won't turn it into a low pass filter. Unless I'm missing something, at least in audio, amplifiers with lower output impedance are always better than those with higher output impedance.
- notfed 3y ago> most headphones work best when the output impedance is less than 1/8th the headphone impedance This doesn't seem to disagree with what you're saying?
- squarefoot 3y ago1/8 max seems still too high to me. For example it would be satisfied by a 12.5 Ohm Zout amp with a 100 Ohm headphone, but that wouldn't be ideal in case of long cables. I'd aim to much lower impedance anyway, especially today that it's easy to obtain with common parts.
- kristianp 3y agoWhat happened to the rule of thumb that output impedence should equal input impedance? That's just a general rule from antennas IIRC.