capacitor upgrade

I don't understand why you want to change from non-polarized to polarized, don't need to. Also, film caps, which are a worthwhile upgrade, are all non-polarized.

A WIMA MKP is a way better choice than any polarized cap.

Arthur

I'm very new in electronics so i have to learn a lot.

i have a plan to change the wima mkp with mundorf Mcap supreme. is it non polarized?

could you guys let me know what brands and type which is film type (maybe just your favorite capacitor)and their sound? so i don't have to worry about the polar.

Thanks you guys can help me.

Mundorfs are non-polarized, forget the whole polarized thing.

Other film caps to consider:
Mundorfs-all models, great extension on top, very high resolution
VH Audio V-Caps, even higher resolution, very even-handed tonality, pricey
Jantzen Z-Superior Copper-the best 'price conscious' cap I've tried, actually very good at any price, great extension on top
Duelund VSF Copper- best of the best, totally natural, just sounds like music, pricey and only come in lower voltage ratings

The only thing you need to watch is voltage rating, make sure it is high enough for application. Coupling caps in CD player shouldn't be a problem as these are likely low voltage, any of these caps (or other film caps) should be fine. You'll find present voltage rating on Wima caps.