Those links are all to film cap comparison. If you have the ability to put in a film cap, it can be much better. However, film caps are significantly larger in physical size and may not fit for the uf value you may need. So, electrolytic capacitors may need to be used in those specific scenarios. Also, this electrolytic capacitor could very well be for a notch filter circuit, which does not affect sound quality as much as other capacitors directly in the signal line.
I usually go for nichicon bipolar caps for speaker crossovers if I need them.
I usually go for nichicon bipolar caps for speaker crossovers if I need them.