I'm not sure that low ESR is desirable for audio - most subjective tests of electrolytics rate low ESR capacitors like the FC, FM, ZL, ZLH, etc. as much harsher-sounding than relatively higher ESR (and physically much larger) caps like Elna Cerafine, Panasonic Pureism, Nichicon Muse KZ and Rubycon Black Gate.
There needs to be some other measure that has a bearing on capacitor linearity (e.g.. how straight is the V vs. t graph when charged at constant current?) as well as how constant C remains with V. All of this is rarely characterized and heavily dependent on electrolyte formulation (aqueous vs. non-aqueous, solid polymer vs. electrolytic, etc.) and chemistry, material properties of the foil, separator, etc.
It's not even clear to me that the most linear caps are the best sounding, but that's another can of worms.
There needs to be some other measure that has a bearing on capacitor linearity (e.g.. how straight is the V vs. t graph when charged at constant current?) as well as how constant C remains with V. All of this is rarely characterized and heavily dependent on electrolyte formulation (aqueous vs. non-aqueous, solid polymer vs. electrolytic, etc.) and chemistry, material properties of the foil, separator, etc.
It's not even clear to me that the most linear caps are the best sounding, but that's another can of worms.
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