GS wrote:

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The non electrolytics have more lifetime.



** Longer than the speaker can possibly last.


In a system, retrofitting with
"better caps" can result in improper repsponse from what a speaker was
voiced at.



** Gobbledegook.



Add resistance and possibly loss, and you have an electrolytic.


** Plus add THD and IM.

The C value is voltage dependant, di-electric losses are large and di-electric absorption massive - none of which is true of film caps.

Non-polar electros are an economy measure fro mass market speakers.

If used in high power professional speaker, they generally explode in short order.



..... Phil