Worth the effort? Cabling inside sub

Eggs ackley! +1 🤗

Fuses usually have to conduct vastly more current than the miniscule amount that is conducted by these wires. Also, in many and perhaps the majority of applications the current through a fuse varies dynamically with the music, and as it does so the resistance of a fuse varies significantly, which can potentially cause a multitude of effects. Those effects will not occur in these wires due to the essentially negligible amount of current they are conducting. Also, the effects of a fuse in many and perhaps most applications can occur at any and all frequencies, rather than just in the deep bass region. Fuses in audio components involve completely different situations than this one.

Regards,
-- Al

Different yes but till you have first hand experiences with that "  these wires due to the essentially negligible amount of current they are conducting " we will know for sure.

Anyway, not a critical issue. Never mind, sorry.

R.

OP:

Meniscus Audio
Madisound
Parts Express
DIYAudio.com

There are safe ways to solder around PTFE, but they involve things like:
- fume hoods with high volume exhaust;
- respirators;
- gloves;
- soldering at eye level so hot gasses flow up and away from the face;
- low temperature solders;
- precision soldering equipment run at the lowest feasible temperature;
- and absolutely not fiddling while you hover over something, while you try to remove a connection that someone else made, which may involve high temp solder or a good mechanical connection.

People do tend to recover from HF burns, but they are insidious. HF burns tend to show up after a number of hours, and get worse for a day or two. You can read all about it in MSDS. Best to avoid.

And also, I agree with everything  @almarg  wrote. Leave the RCA wires alone.