Worth the effort? Cabling inside sub

Save your money. You won't hear any difference. From any of it. Caps are a big deal in crossovers and other circuits because the ear is highly sensitive to even the most subtle changes from midrange on up. If this was a speaker crossover you could line up a selection of expensive quality caps and hear differences between them all. With a sub that all goes away. 

The same applies to the wire. Duke (Audiokinesis) told me save my money on sub speaker cables, just use wire off a roll. He was right. No difference. Huge difference with speakers that go higher. No difference with subs.

Those input wires by the way carry almost no current so can be thin, and quality won't matter there either. Look close at my system. Look how much money I am willing to spend on things that do make a difference. Then look real close at the crap patch cord going to the subs.  https://systems.audiogon.com/systems/8367 I tried some really nice interconnects, that make a huge improvement everywhere else, couldn't hear any difference on the subs. Human ears simply are not sensitive to subtle timing or whatever it is at such low frequencies. We respond to volume. Which is why multiple sub distributed bass arrays work so well.

Save your money, buy more subs. The more the better. A difference you are guaranteed to hear.

@eyrepm,

Can't open the pix in link.

I have done a fair bit of work with speakers testing the effects of LF when changes are done to power cords, cables, etc. The changes are easily heard and most efficacious. 

When Bill Dudleston of Legacy Audio entertained my idea of rewiring the Whisper with 10 Ga Clarity Cables, and added his own idea of Clarity Caps (no business relation to Clarity Cable), he was not expecting much. However, the bass measurements showed a 2dB change! That's big shift in performance for bass! 

Subwoofers are subject to the precise same influences as other speakers. The qualitative difference in performance is easily heard when enhancements/improvements are done. It's nonsense to suggest a subwoofer would not benefit from upgrades such as internal cable and caps. 

Do the upgrade; I think you'll be quite pleased with the result.  YMMV 

And its worse than nonsense to conflate and confuse internal cabling, the wire from the amp to the driver which does carry a lot of current, with the input wire, which does not.. Can't keep something that simple straight, why expect any better from the rest?

Btw, doesn't YMMV mean your mileage may vary? As in, expect different results? So what you really said is, You'll be pleased with the results... unless something different happens. Brilliant!

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.