why do people feel the need to buy expensive cable

@tobor007 - RE: Weakest link may be in the box.

it’s a bit like the reverse of taking the position that using good power cables is sensless when there is romex in the wall

However - the wires inside the box are generally individual conductors and not subject to RFI/EMI to the same levels as many speaker cables

From that perspective the individual conductors will convey the signal more effectively. So very often they are far from the weakest link

But you really need to assess what is on the inside before making any judgement.

Old speakers do tend to have very poor wiring in them so it is well worth replacing the wire, whereas newer speakers tend to have pretty good wire in them.

Does it hurt to upgrade - no.
Is it really required? - only if you feel the need to scratch that particular "ITCH"
Will you benefit? - probably - if you know what you are doing

Binding Posts are probably of more concern and in many cases, they should be replaced - so while you have the wiring exposed - change it - i.e. if needed

Regards - Steve

Two of the speakers I used to own are internally wired with Supra Ply. I tried Supra Ply SCs and the sound was okay. Using different SCs sounded better. It's not always the case that what's used inside a speaker is good enough for use as SCs.

All the best,
Nonoise

I had the same experience with DALI as nonoise  

Some might find this Cable Snake Oil Antidote interesting with respect to LRC, the signal and the system.

Cables affect the sound and the effect is system dependent.

Another's opinion on a cable in a vastly different system may not be valid.

There are two very easy ways to debunk outrageous cable, "power conditioner", "isolator", "speaker cable suspender", "special capacitor", and "special resistor" claims:

1) Measure the electrical and acoustical signals with the allegedly improved "product" versus without. It's the year 2018 folks. We now have cheap devices that detect all aspects of sound (phase, pressure, frequency) at a level that is orders of magnitude better than average human hearing. What once cost tens of thousands of dollars in testing equipment can practically be obtained for several hundred with a high performance laptop, high quality calibrated microphone, and audio test suite freeware.

2) Research the backgrounds of the individuals who own and run the companies that are peddling "special resistors", "speaker cable suspenders" and the like. I've been observing this scam for nearly 4 decades and every single "manufacturer" of said products I've looked into is run by con artists and fast talking salesmen/women.  Just like there are tons of con artists peddling miracle health cures, there are and unfortunately probably always will be con artists selling magic cables and capacitors that some how fix everything that is wrong with your audiofool system.