Replacing caps on crossovers?

Thanks for the info so far, my speakers are Naim NBLs and the crossover is separate from the speaker and mounts on the back. Looks like it would be very easy replace any given part. The speaker is designed to be used passive with the crossover and active. The gains going active are apparently huge that makes me question if crossover parts are improved will I get part way there?

@musichead   my opinion , sorry, is waisting the time. Is almost impossible get change the sound by  changing capacitor.
try to change the driver or whole speaker

I would definitely change those Solen caps and sand resistors, you would get a more refined sound and clean up that nasal sound solen caps have.

@musichead 

If you can get a schematic of your crossover,  I'll offer some guidance of which parts to replace.