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.
