Dear @eyrepm : """
It's nonsense to suggest a subwoofer would not benefit from upgrades such as internal cable and caps. """
Agree totally with that statement from @douglas_schroeder . Millercarbon and whom gave him the advise are wrong and if they can be aware of a change in the quality level pérfomance for the better could be only because their systems are really poor in resolution and quality or are " deaf ".
I did it changes in my Velodyne's, changing all internal wiring using all silver KCAG by Kimber Kable. Big diferences. If you want to change caps in the electronics the Wima FKP-1 are better that what you or other people can thing.
Anyway, go a head.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.