Quote:
Originally Posted by triez  Does anyone use low ESR electrolytics for audio replacement? I use them when I repair switchmode supplies, I always wondered what effect they would have if used in audio circuits. |
You can pretty much calculate the difference from the data sheets. Add the ESR and ESL in series with cap as if they were independant components.
In the simple example of a DC blocking cap, with say a 22 uf and 100k to ground would nominally be a .072343Hz HPF, but with 10 ohms of ESR that pole would shift to .072335 Hz.. In fact the calculation is nonsense since the ESR is within the tolerance range of most resistors and surely any cap you would use.
IMO the only place in audio where this might make a difference is in power supply decoupling for stiffer rails, and perhaps cheap passive loudspeaker crossovers (ugh).
I generally try not to use electrolytic capacitors to make audible frequency poles. Since changing terminal voltage across electrolytics can cause other nonlinearities to express (voltage coefficient, dielectric absorption, etc). So set your poles adequately low and relax.
JR